Modine Separated Combustion Gas-Fired Unit Heaters Heaters Installation & Service Manual

Marque: Modine

Modèle: Separated Combustion Gas-Fired Unit Heaters

Taper: Heaters Installation & Service Manual

THIS MANUAL IS THE PROPERTY OF THE OWNER.

PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

Inspection on Arrival

1. Inspect unit upon arrival. In case of damage, report it

immediately to transportation company and your local

Modine sales representative.

Check rating plate on unit to verify that power supply meets

available electric power at the point of installation.

3. Inspect unit upon arrival for conformance with description of

product ordered (including specifications where applicable).

Table of Contents

Inspection on Arrival................................. 1

Special Precautions ................................. 2

SI (Metric) Conversion Factors ........................ 3

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Unit Location ...................................... 4

Combustible Material and Service Clearances .......... 4

Unit Mounting .................................... 5

Installation ........................................ 6

Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Gas Connections .................................11

High-Altitude Accessory Kit ........................ 12

Electrical ...................................... 13

Installation with Ductwork.......................... 15

Requirements/Adjustments and Data for Blower Units.... 15

Start-Up Procedure/Operation ........................ 20

Unit Components .................................. 21

Performance Data - General ......................... 22

Performance Data - Downturn Hoods .................. 23

Dimensions....................................... 24

Service/Troubleshooting............................. 26

Model/Serial Number/Replacement Parts ............... 27

Commercial Warranty........................Back Cover

INSTALLATION AND SERVICE MANUAL

separated combustion gas-fired unit heaters

model PTS and BTS

6-561.12

5H0801060000

All models approved for use in California by the CEC and in

Massachusetts. Unit heater is certified for non-residential

applications.

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS:

1. Open windows.

2. Do not try to light any appliance.

3. Do not touch any electrical switch; do not use any

phone in your building.

4. Extinguish any open flame.

5. Immediately call your gas supplier from

a neighbor’s phone. Follow the gas supplier’s

instructions. If you can not reach your gas supplier,

call your fire department.

FOR YOUR SAFETY

The use and storage of gasoline or other flammable

vapors and liquids in open containers in the vicinity of this

appliance is hazardous.

The use of this manual is specifically intended for a

qualified installation and service agency. All installation

and service of these units must be performed by a

qualified installation and service agency.

1. Improper installation, adjustment, alteration, service,

or maintenance can cause property damage, injury, or

death, and could cause exposure to substances which

have been determined by various state agencies to

cause cancer, birth defects, or other reproductive

harm. Read the installation, operating, and

maintenance instructions thoroughly before installing

or servicing this equipment.

2. Do not locate ANY gas-fired units in areas where

chlorinated, halogenated, or acidic vapors are present

in the atmosphere. These substances can cause

premature heat exchanger failure due to corrosion,

which can cause property damage, serious injury, or

death.

ARNING

IMPOR

ANT

October 2019

6-561.12

SPECIAL PRECAUTIONS

THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN

THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT

AND TROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR CARE

MUST BE EXERCISED REGARDING THE SPECIAL PRECAUTIONS LISTED

BELOW. FAILURE TO PROPERLY ADDRESS THESE CRITICAL AREAS

COULD RESULT IN PROPERTY DAMAGE OR LOSS, PERSONAL INJURY,

OR DEATH. THESE INSTRUCTIONS ARE SUBJECT TO ANY MORE

RESTRICTIVE LOCAL OR NATIONAL CODES.

HAZARD INTENSITY LEVELS

1. DANGER: Indicates an imminently hazardous situation

which, if not avoided, WILL result in death or serious injury.

2. WARNING: Indicates a potentially hazardous situation

which, if not avoided, COULD result in death or serious injury.

3. CAUTION: Indicates a potentially hazardous situation which,

if not avoided, MAY result in minor or moderate injury.

4. IMPORTANT: Indicates a situation which, if not avoided,

MAY result in a potential safety concern.

DANGER

Appliances must not be installed where they may be exposed

to a potentially explosive or flammable atmosphere.

1. Gas fired heating equipment must be vented - do not

operate unvented.

2. A built-in power exhauster is provided - additional external

power exhausters are not required or permitted.

3. If an existing heater is being replaced, it may be necessary

to resize the venting systems. Improperly sized venting

systems can result in vent gas leakage or the formation of

condensate. Refer to the National Fuel Gas Code ANSI

Z223.1 (NFPA 54) or CSA B149.1 - latest edition. Failure

to follow these instructions can result in injury or death.

4. Under no circumstances should two sections of double

wall vent pipe be joined together within one horizontal

vent system due to the inability to verify complete seal of

inner pipes.

5. All field gas piping must be pressure/leak tested prior to

operation. Never use an open flame. Use a soap solution

or equivalent for testing.

6. Gas pressure to appliance controls must never exceed

14" W.C. (1/2 psi).

7. To reduce the opportunity for condensation, the minimum

sea level input to the appliance, as indicated on the serial

plate, must not be less than 5% below the rated input, or

5% below the minimum rated input of dual rated units.

8. Disconnect power supply before making wiring

connections to prevent electrical shock and equipment

damage.

9. All appliances must be wired strictly in accordance with

wiring diagram furnished with the appliance. Any wiring

different from the wiring diagram could result in a hazard

to persons and property.

10. Any original factory wiring that requires replacement must

be replaced with wiring material having a temperature

rating of at least 105°C.

11. Ensure that the supply voltage to the appliance, as

indicated on the serial plate, is not 5% greater than the

rated voltage.

12. When servicing or repairing this equipment, use only

factory-approved service replacement parts. A complete

replacements parts list may be obtained by contacting

the factory. Refer to the rating plate on the appliance for

complete appliance model number, serial number, and

company address. Any substitution of parts or controls not

approved by the factory will be at the owner's risk.

CAUTION

1. All literature shipped with this unit should be kept for

future use for servicing or service diagnostics. Do not

discard any literature shipped with this unit.

2. Consult piping, electrical, and venting instructions in this

manual before final installation.

3. Do not attach ductwork, air filters, or polytubes to any

propeller unit heater.

4. Clearances to combustible materials are critical. Be sure

to follow all listed requirements.

5. Heaters are designed for use in heating applications with

ambient startup temperatures between -40°F and 90°F

and ambient operating temperatures between 40°F and 90°F.

6. Do not install unit outdoors.

7. In garages or other sections of aircraft hangars such as

offices and shops that communicate with areas used for

servicing or storage, keep the bottom of the unit at least

7' above the floor unless the unit is properly guarded to

provide user protection from moving parts. In parking

garages, the unit must be installed in accordance with the

standard for parking structures ANSI/NFPA 88A - latest

edition, and in repair garages the standard for repair

garages NFPA 30A - latest edition. In Canada, installation

of heaters in airplane hangars must be in accordance with

the requirements of the enforcing authority, and in public

garages in accordance with the current CSA-B149 codes.

8. In aircraft hangars, keep the bottom of the unit at least 10'

from the highest surface of the wings or engine enclosure

of the highest aircraft housed in the hangars and in

accordance with the requirements of the enforcing

authority and/or NFPA 409 - latest edition (Formerly

NFPA 88B).

9. Installation of units in high humidity or salt water

atmospheres will cause accelerated corrosion, resulting in

a reduction of the normal life of the units.

10. Do not install units below 7' measured from the bottom of

the unit to the floor in commercial applications (unless unit

is properly guarded to provide user protection from

moving parts).

11. Be sure no obstructions block air intake and discharge of

unit heaters.

12. The minimum distance from combustible material is based

on the combustible material surface not exceeding 160°F.

Clearance from the top of the unit may be required to be

greater then the minimum specified if heat damage, other

than fire, may occur to materials above the unit heater at

the temperature described.

13. Allow 18" of clearance at rear (or 12" beyond end of

motor at rear of unit, whichever is greater) and access

side to provide ample air for proper operation of fan.

14. Installation must conform with local building codes or in

the absence of local codes, the National Fuel Gas Code,

ANSI Z223.1 (NFPA 54) - latest edition. In Canada

installation must be in accordance with CSA-B149.1.

15. The concentric vent adapter box must be installed inside

of the structure or building. Do not install this box on the

exterior of a building or structure.

ARNING

6-561.12

In the U.S., the installation of these units must comply with the

National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest edition

and other applicable local building codes. In Canada, the

installation of these units must comply with local plumbing or

waste water codes and other applicable codes and with the

current code CSA-B149.1.

1. All installation and service of these units must be

performed by a qualified installation and service agency

only as defined in ANSI Z223.1 (NFPA 54) - latest edition or

in Canada by a licensed gas fitter.

2. This unit is certified with the controls furnished. For

replacements parts, please order according to the

replacement parts list on serial plate. Always know your

model and serial numbers. Modine reserves the right to

substitute other authorized controls as replacements.

3. Unit is balanced for correct performance. Do not alter fan

or operate motors at speeds below what is shown in this

manual.

4. Information on controls is supplied separately.

5. The same burner is used for natural and propane gas.

SPECIAL PRECAUTIONS / SI (METRIC) CONVERSION FACTORS

To Convert Multiply By To Obtain

"W.C. 0.249 kPa

°F (°F-32) x 5/9 °C

BTU 1.06 kJ

Btu/ft

37.3 kJ/m

Btu/hr 0.000293 kW

CFH (ft

/hr) 0.000472 m

/min

CFH (ft

/hr) 0.00000787 m

CFM (ft

/min) 0.0283 m

/min

CFM (ft

/min) 0.000472 m

feet 0.305 m

Gal/Hr. 0.00379 m

/hr

Gal/Hr. 3.79 l/hr

gallons 3.79 l

Horsepower 746 W

inches 25.4 mm

pound 0.454 kg

psig 6.89 kPa

psig 27.7 "W.C.

SI (Metric) Conversion Factors

CAUTION

16. Purging of air from gas supply line should be performed

as described in the National Fuel Gas Code, ANSI Z223.1

(NFPA 54) - latest edition. In Canada, installation must be

in accordance with CSA-B149.1.

17. When leak testing the gas supply piping system, the

appliance and its combination gas control must be

isolated during any pressure testing in excess of 14" W.C.

(1/2 psi).

18. The unit should be isolated from the gas supply piping

system by closing its field installed manual shut-off valve.

This manual shut-off valve should be located within 6' of

the heater.

19. Turn off all gas before installing appliance.

20. Ensure that the supply voltage to the appliance, as

indicated on the serial plate, is not less than 5% below the

rated voltage.

21. Check the gas inlet pressure at the unit upstream of the

combination gas control. The inlet pressure should be

6-7" W.C. on natural gas or 11-14" W.C. on propane. If

inlet pressure is too high, install an additional pressure

regulator upstream of the combination gas control.

22. Service or repair of this equipment must be performed by

a qualified service agency.

23. Do not attempt to reuse any mechanical or electronic

ignition controller which has been wet. Replace defective

controller.

1. To prevent premature heat exchanger failure, do not locate

ANY gas-fired appliances in areas where corrosive vapors

(i.e. chlorinated, halogenated, or acidic) are present in the

atmosphere.

2. To prevent premature heat exchanger failure, the input to

the appliance as indicated on the serial plate must not

exceed the rated input by more then 5%.

3. To prevent premature heat exchanger failure, observe

heat exchanger tubes. If the tubes become red while

blower and furnace are in operation, check to be sure the

blower has been set to the proper rpm for the application.

Refer to page 15 for Blower Adjustments.

4. Start-up and adjustment procedures should be performed

by a qualified service agency.

5. To check most of the Possible Remedies in the trouble-

shooting guide listed in Table 26.1 refer to the applicable

sections of the manual.

BEFORE YOU BEGIN

CAUTION

1. All literature shipped with this unit should be kept for future

use for servicing or service diagnostics. Leave manual with

the owner. Do not discard any literature shipped with this unit.

2. Consult piping, electrical, and venting instructions in this

manual before final installation.

3. Do not attach ductwork, air filters, or polytubes to any

propeller unit heater.

IMPOR

ANT

6-561.12

Location Recommendations

1. When locating the heater, consider general space and

heating requirements, availability of gas and electrical supply,

and proximity to vent locations.

2. When locating units, it is important to consider that the

combustion air and exhaust vent piping must be connected

to the outside atmosphere. Vent terminals should be located

adjacent to one another. Maximum equivalent vent lengths

are listed in “Section A - General Instruction - All Units” of the

Venting instructions.

3. Be sure the structural support at the unit location site is

adequate to support the unit's weight. Refer to pages 24-25

for unit weights. For proper operation the unit must be

installed in a level horizontal position.

4. Do not install units in locations where the flue products

can be drawn into the adjacent building openings such as

windows, fresh air intakes, etc.

5. Be sure that the minimum clearances to combustible

materials and recommended service clearances are

maintained. Units are designed for installation with the

minimum clearances as shown in Figure 4.1 and Table 4.1.

UNIT LOCATION

Table 4.1 - Clearances

Figure 4.1 - Combustible Material and Service Clearances

TOP

BOTTOM

NON

ACCESS

SIDE

ACCESS

SIDE

UNIT LOCATION

6. Do not install units in locations where gas ignition system is

exposed to water spray, rain, or dripping water.

7. Mounting height (measured from bottom of unit) at which unit

heaters are installed is critical. Refer to mounting height and

heat throw data on page 22 of this manual. The maximum

mounting height for any unit is that height above which the

unit will not deliver heated air to the floor.

Sound and Vibration Levels

All standard mechanical equipment generates some sound and

vibration that may require attenuation. Libraries, private offices

and hospital facilities will require more attenuation, and in such

cases, an acoustical consultant may be retained to assist in the

application. Locating the equipment away from the critical area

is desirable within ducting limitations. Generally, a unit should

be located within 15' of a primary support beam. Smaller

deflections typically result in reduced vibration and noise

transmission.

DANGER

Appliances must not be installed where they may be

exposed to a potentially explosive or flammable atmosphere.

CAUTION

Unit Side

Clearance To Recommended

Combustible Materials Service Clearance

Top and Bottom 6" 18"

Access Side 6" 18"

Non-Access Side 6" 18"

Rear 18" 18"

Vent Connector 6" 18"

To prevent premature heat exchanger failure, do not locate

ANY gas-fired appliances in areas where corrosive vapors

(i.e. chlorinated, halogenated or acidic) are present in the

atmosphere.

IMPOR

ANT

1. Clearances to combustible materials are critical. Be sure to

follow all listed requirements.

2. Heaters are designed for use in heating applications with

ambient startup temperatures between -40°F and 90°F,

and ambient operating temperatures between 40°F and 90°F.

3. Do not install unit outdoors.

4. In garages or other sections of aircraft hangars such

as offices and shops that communicate with areas used for

servicing or storage, keep the bottom of the unit at least

7' above the floor unless the unit is properly guarded.

In parking garages, the unit must be installed in accordance

with the standard for parking structures ANSI/NFPA 88A -

latest edition, and in repair garages the standard for repair

garages NFPA 30A - latest edition (Formerly NFPA 88B).

In Canada, installation of heaters in airplane hangars must

be in accordance with the requirements of the enforcing

authority, and in public garages in accordance with the

current CSA-B149 codes.

5. In aircraft hangars, keep the bottom of the unit at least

10' from the highest surface of the wings or engine

enclosure of the highest aircraft housed in the hangars

and in accordance with the requirements of the enforcing

authority and/or NFPA 409 - latest edition.

6. Installation of units in high humidity or salt water

atmospheres will cause accelerated corrosion resulting in

a reduction of the normal life of the units.

6-561.12

1. Be sure the means of suspension is adequate to support

the weight of the unit (see pages 24-25 for unit weights).

2. For proper operation, the unit must be installed in a level

horizontal position.

3. Clearances to combustibles as specified in Table 4.1 must be

strictly maintained.

4. All standard units are shipped fully boxed. Larger units are

also supplied with skid supports on the bottom of the box.

The larger units may be lifted from the bottom by means of a

fork lift or other lifting device only if the shipping support skids

are left in place and the forks support the whole depth of the

unit. If the unit must be lifted from the bottom for final

installation without the carton in place, be sure to properly

support the unit over its entire length and width to prevent

damage. When lifting units, make sure the load is balanced.

5. Propeller models have four mounting holes and blower

models have 6 mounting holes. The units can be mounted

with 3/8"-16 threaded rod as follows:

• On each piece of threaded rod used, screw a nut a distance

of about 1" onto the end of the threaded rods that will be

screwed into the unit heater.

• Place a washer over the end of the threaded rod and screw

the threaded rod into the unit heater weld nuts on the top of

the heater at least 5 turns, and no more than 10 turns.

Tighten the nut first installed onto the threaded rod to

prevent the rod from turning.

• Drill holes into a steel channel or angle iron at the same

center-line dimensions as the heater that is being installed.

The steel channels or angle iron pieces need to span and

be fastened to appropriate structural members.

• Cut the threaded rods to the preferred length, place them

through the holes in the steel channel or angle iron and

secure with washers and lock nuts or lock washers and

nuts. A double nut arrangement can be used here instead of

at the unit heater (a double nut can be used both places but

is not necessary).

• Do not install standard unit heaters above the maximum

mounting height shown in Tables 22.1 or 22.2.

NOTE: A pipe hanger adapter kit, shown in Figure 5.1 is

available as an accessory. One kit consists of drilled 3/4" IPS

pipe caps and 3/8"-16 x 1-1/2" capscrews to facilitate

threaded pipe suspension.

UNIT MOUNTING

Figure 5.1 - Unit Heater Suspension Methods

CAUTION

1. Do not install units below 7' measured from the bottom of

the unit to the floor in commercial applications (unless

unit is properly guarded to provide user protection from

moving parts).

2. Be sure no obstructions block air intake and discharge

of unit heaters.

3. The minimum distance from combustible material is

based on the combustible material surface not exceeding

160°F. Clearance from the top of the unit may be required

to be greater than the minimum specified if heat damage,

other than fire, may occur to materials above the unit

heater at the temperature described.

4. Allow 18" clearance at rear (or 12" beyond end of motor

at rear of unit, whichever is greater) and access side to

provide ample air for proper operation of fan.

(Threaded Rod) (Pipe Adapter Kit)

6-561.12

Section A - General Instructions - All Units

A1. If the unit heater being installed is replacing existing

equipment and using the existing vent system from that

equipment, inspect the venting system for proper size and

horizontal pitch, as required in the National Fuel Gas Code,

ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code -

latest edition and these instructions. Determine that there is

no blockage or restriction, leakage, corrosion and other

deficiencies, which could cause an unsafe condition.

A2. The vent pipe should be galvanized steel or other suitable

corrosion resistant material. Follow the National Fuel Gas

Code for minimum thickness of vent material. The minimum

thickness for connectors varies depending on the pipe

diameter. Do not vent unit with PVC or other forms of

plastic venting material.

INSTALLATION - VENTING

 See Instruction A12 for attaching single wall pipe to double wall pipe.

Figure 6.1 - Venting Through Combustible Roof or Wall

Specified

Terminal

Flashing

Listed

Thimble

Specified

Terminal

Flashing

Clearance Specified

by Type B Vent Mfg.

Listed

Thimble

Single Wall Vent Pipe

Double Wall Vent Pipe 

Single Wall Vent Pipe Terminating

with Double wall vent pipe. 

Single Wall Vent Pipe

Double

Wall

Single

Wall

Specified

Terminal

Clearance Specified

by Type B Vent Mfg.

Single

Wall

Specified

Terminal

1. Gas fired heating equipment must be vented - do not

operate unvented.

2. A built-in power exhauster is provided - additional external

power exhausters are not required or permitted.

3. If an existing heater is being replaced, it may be

necessary to resize the venting systems. Improperly sized

venting systems can result in vent gas leakage or the

formation of condensate. Refer to the National Fuel Gas

Code ANSI Z223.1 (NFPA 54) or CSA B149.1 - latest

edition. Failure to follow these instructions can result in

serious injury or death.

4. Under no circumstances should two sections of double

wall vent pipe be joined together within one horizontal

vent system due to the inability to verify complete seal of

inner pipes.

Applicable Installation Instructions

Instructions by Vent System Type

A General Instructions for ALL installations

B VERTICAL 2-PIPE vent systems 

C HORIZONTAL 2-PIPE vent systems 

HORIZONTAL AND VERTICAL CONCENTRIC

vent systems 

CAUTION

Installation must conform with local building codes or in the

absence of local codes, with the National Fuel Gas Code,

ANSI Z223.1 (NFPA 54) - latest edition. In Canada installation

must be in accordance with CSA B149.1.

Model PTS/BTS unit heaters must be vented with the proper

passageway as described in these instructions to convey flue

gases from the unit or the vent connector to the outside

atmosphere. The heaters must also have a separate

combustion air intake pipe to bring in fresh air for combustion

from the outside atmosphere.

The venting instructions are organized in sections, based on

installation type. The sections are identified as follows:

A3. All heaters come with factory installed vent and combustion

air adapters for attaching the vent pipe to the heater:

Attach the vent pipe to the adapter with 3 corrosion-

resistant screws (Drill pilot holes through the vent pipe and

adapter prior to screwing in place). Vent pipe must not be

smaller than the connector size.

A4. Refer to Table 6.1 for total equivalent vent pipe lengths,

making the vent system as straight as possible. The

equivalent length of a 4" elbow is 5' and for a 6" elbow is 7'.

A5. Horizontal sections of vent pipe are to be installed with an

upward or downward slope from the appliance of 1/4 inch

per foot and suspended securely from overhead structures

at points not greater than 3' apart.

A6. Fasten individual lengths of vent together with at least three

corrosion resistant sheet metal screws.

A7. Keep single wall vent pipe at least 6" from combustible

materials. For double wall vent pipe, follow the vent pipe

manufacturer’s clearances to combustibles. The minimum

distance from combustible materials is based on the

combustible material surface not exceeding 160°F.

Clearance from the vent pipe (or the top of the unit) may be

required to be greater than 6" if heat damage other than fire

could result (such as material distortion or discoloration).

A8. Avoid venting through unheated space when possible.

When venting does pass through an unheated space or

if the unit is installed in an environment that promotes

condensation, insulate runs greater than 5' to minimize

condensation. Inspect for leakage prior to insulating and use

insulation that is noncombustible with a rating of not

 The differences between vertical and horizontal vent systems in 2-Pipe or

concentric vent congurations will be identied in “Section A - General

Instructions – All Units”.

ARNING

Table 6.1 - Vent Pipe Diameters, Transitions, and Total

Equivalent Vent Pipe Lengths For Horizontal and Vertical

Venting Systems

Model

Size

Vent Pipe Diameter

Equivalent Vent Length

Minimum Maximum

150

4" 5' 25'

175-200

4" 5' 50'

250-400

6" 5' 50'

6-561.12

less than 400°F. Install a tee fitting at the low point of the

vent system and provide a drip leg with a clean out cap as

shown in Figure 8.1.

A9. When the vent passes through a combustible INTERIOR

wall or floor, a metal thimble 4" greater than the vent

diameter is necessary. If there is 6' or more of vent pipe in

the open space between the appliance and where the vent

pipe passes through the wall or floor, the thimble need only

be 2" greater than the diameter of the vent pipe. If a

thimble is not used, all combustible material must be cut

away to provide 6" of clearance. Where authorities have

jurisdiction, Type B vent may be used for the last section of

vent pipe to maintain clearance to combustibles while

passing through wall or floor (see Figure 6.1). Any material

used to close the opening must be noncombustible.

A10. Seal all seams and joints of un-gasketed single wall pipe

with metal tape or Silastic suitable for temperatures up to

400°F. Wrap the tape 2 full turns around the vent pipe. One

continuous section of double wall vent pipe may be used

within the vent system to pass through the wall to the listed

vent cap. Refer to instruction A12 in “Section A – General

Instructions – All Units” for attaching double wall pipe to

single wall pipe.

A11. The following are General Instructions for Double Wall

(Type B) Terminal Pipe Installation:

How to attach a single wall vent terminal to double wall

(Type B) vent pipe:

1. Look for the “flow” arrow on the vent pipe.

2. Slide the vent terminal inside the exhaust end of the

double wall vent pipe.

3. Drill 3 holes through the pipe and the vent terminal.

Using 3/4" long sheet metal screws, attach the cap to

the pipe. Do not over tighten.

How to connect a single wall vent system to a double wall

(Type B) vent pipe:

1. Slide the single wall pipe inside the inner wall of the

double wall pipe.

2. Drill 3 holes through both walls of the single and double

wall vent pipes. Using 3/4" sheet metal screws, attach

the 2 pieces of pipe. Do not overtighten.

3. The gap between the single and double wall pipe must

be sealed but it is not necessary to fill the full volume of

the annular area. To seal, run a large bead of 400°F

silastic around the gap.

INSTALLATION - VENTING

 Do not terminate the vent directly above a gas meter or regulator.

Table 7.1 - Vent Termination Clearances

A12. Vent termination clearances must be maintained:

A13. Do NOT vent this appliance into a masonry chimney.

A14. Do NOT use dampers or other devices in the vent or

combustion air pipes.

A15. The venting system must be exclusive to a single

appliance and no other appliance is allowed to be vented

into it.

A16. Precautions must be taken to prevent degradation of

building materials by flue products.

A17. Single wall vent pipe must not pass through any

unoccupied attic, inside wall, concealed space, or floor.

A18. Uninsulated single wall vent pipe must not be used

outdoors for venting appliances in regions where the 99%

winter design temperature is below 32°F.

A19. Long runs of horizontal or vertical combustion air pipes

may require insulation in very cold climates to prevent the

buildup of condensation on the outside of the pipe where

the pipe passes through conditioned spaces.

A20. Vertical combustion air pipes should be fitted with a tee

with a drip leg and a clean out cap to prevent against the

possibility of any moisture in the combustion air pipe from

entering the unit. The drip leg should be inspected and

cleaned out periodically during the heating season.

A21. The vent terminal must be:

A22. In addition to following these general instructions, specific

instructions for vertical and horizontal vent systems in

2-Pipe or concentric vent configurations must also be

followed. The following outlines the differences:

Vertical Category III Vent System Determination

• Vertical vent systems terminate vertically (up)

(an example is shown in Figure 8.1).

• Determine the venting configuration as follows:

> For two building penetrations through the wall or roof

(one for the combustion air inlet pipe and one for the

vent pipe), proceed to “Section B - Vertical 2-Pipe

Venting".

> For a single larger building penetration through the

wall or roof, through which both the combustion air

inlet and vent pipes will pass, proceed to “Section D -

Horizontal and Vertical Concentric Venting".

> For all other cases, proceed to the next section for

Horizontal Vent System Determination.

Horizontal Category III Vent System Determination

• Horizontal vent systems terminate horizontally

(sideways) (an example is shown in Figure 8.2).

• Determine the venting configuration as follows:

> For 2 building penetrations through the wall or roof

(1 for the combustion air inlet pipe and 1 for the vent

pipe), proceed to “Section C - Horizontal 2-Pipe

Venting".

> For a single larger building penetration through the

wall or roof, through which both the combustion air

inlet and vent pipes will pass, proceed to “Section D -

Horizontal and Vertical Concentric Venting".

Minimum Clearances for

Structure Vent Terminal Location

Forced air inlet within 10 feet 3 feet above

Combustion air inlet of another

appliance

6 feet all directions

Door, window, gravity air inlet, 4 feet horizontal and below

or any building opening 1 foot above

Electric meter, gas meter, gas 4 feet horizontal (U.S.)

regulator, and relief equipment  6 feet horizontal (Canada)

Gas regulator

3 feet horizontal (U.S.)

6 feet horizontal (Canada)

Adjoining building or parapet wall 6 feet all directions

Adjacent public walkways 7 feet all directions

Grade (ground level) 3 feet above



Table 7.2 - Vent Terminals

Model Size Modine PN

150-200 5H0722850001

250-400 5H0722850002

6-561.12

Section C - Horizontal 2-Pipe Vent System Installation

C1. This section applies to horizontally vented 2-pipe vent

systems (1 combustion air inlet pipe and 1 vent pipe) and is

in addition to “Section A - General Instructions - All Units”.

Category III vent systems listed by a nationally recognized

agency and matching the diameters specified may be used.

Different brands of vent pipe materials may not be

intermixed. Under no circumstances should two sections of

double wall vent pipe be joined together within one horizontal

vent system due to the inability to verify complete seal of

inner pipes.

C2. Horizontal vent systems terminate horizontally (sideways).

C3. All horizontal vents must be terminated with a listed vent

cap. The cap must terminate a minimum distance from the

external wall, as summarized in Figure 8.2.

C4. The termination of horizontally vented system must extend

16" beyond the exterior surface of an exterior wall.

C5. The combustion air pipe must be a minimum of 6" below the

vent pipe, and 4" from the exterior wall.

C6. Construct the vent system as shown in Figure 8.2.

Rise X (in) Roof Pitch Min Height H (ft) 

0-6 Flat to 6/12 1.00

6-7 6/12 to 7/12 1.25

7-8 7/12 to 8/12 1.50

8-9 8/12 to 9/12 2.00

9-10 9/12 to 10/12 2.50

10-11 10/12 to 11/12 3.25

11-12 11/12 to 12/12 4.00

12-14 12/12 to 14/12 5.00

14-16 14/12 to 16/12 6.00

16-18 16/12 to 18/12 7.00

18-20 18/12 to 20/12 7.50

20-21 20/12 to 21/12 8.00

Section B - Vertical 2-Pipe Vent System Installation

B1. This section applies to vertically vented 2-pipe

(1 combustion air inlet pipe and 1 vent pipe) vent systems

and is in addition to “Section A - General Instructions -

All Units”.

B2. Vertical vent systems terminate vertically (up).

B3. It is recommended to install a tee with drip leg and clean

out cap as shown in Figure 8.1.

B4. The combustion air and vent pipes must be terminated with

2 listed vent caps.

B5. Vertical vents must terminate a minimum horizontal and

vertical distance from roof lines and adjacent walls or

obstructions. These minimum distances are outlined in

Figure 8.1 and Table 8.1.

B6. The vent must terminate at least 1' above and 6"

horizontally from the combustion air inlet.

B7. Once venting is complete, proceed to section titled

“Installation - Gas Connections".

INSTALLATION - VENTING

Table 8.1 - Minimum Height from Roof to Lowest Discharge

Opening

 Size according to expected snow depth.

Figure 8.2 - Horizontal Venting with Downward Pitch

COMBUSTION AIR

EXHAUST

SLOPE 1/4" PER FOOT

DOWNWARD FROM UNIT

TEE WITH DRIP LEG AND

CLEANOUT CAP AT LOW

POINT OF VENT SYSTEM

LISTED

TERMINAL

SUPPORT BRACKET

6" MIN

2' MIN

4" MIN

12"

ADJACENT

BUILDING

12" MIN

RECOMMENDED

4" MIN

TEE WITH DRIP LEG

AND CLEANOUT CAP

(SLOPE 1/4" PER

FOOT DOWNWARD

TOWARD DRIP LEG)

COMBUSTION AIR

EXHAUST

"H" MIN*

12" MIN

RECOMMENDED

4" MIN

BACK VIEW

ROOF PITCH IS:

X / 12

"H" MIN*

(SEE TABLE 8.1)

TEE WITH DRIP LEG

AND CLEANOUT CAP

(SLOPE 1/4" PER

FOOT DOWNWARD

TOWARD DRIP LEG)

ROOF FLASHING

USE LISTED THIMBLE

THROUGH ROOF AND

CEILING

COMBUSTION AIR

EXHAUST

LISTED TERMINAL

* SIZE ACCORNING

TO EXPECTED

SNOW DEPTH.

TO WALL OR ADJOINING BUILDING

12" MIN

12" MIN*

2' MIN

6" MIN

USE THIMBLE

THROUGH

CELLING

ROOF FLASHING

TERMINAL

Figure 8.1 - Vertical 2-Pipe Vent System

6-561.12

C7. When horizontal vents pass through a combustible wall

(up to 22" thick), the vent passage must be constructed and

insulated as shown in Figure 9.1.

C8. The vent must be supported as shown in Figure 9.1.

C9. When condensation may be a problem, the vent system

shall not terminate over public walkways or over an area

where condensate or vapor could create a nuisance or

hazard, or could be detrimental to the operation of

regulators, relief openings, or other equipment.

C10. Maintain a 1/4" per foot downward slope away from the

heater and place a drip leg with clean out near the exit of

the vent as shown in Figure 8.2, or allow the condensate

to drip out the end.

C11. For a vent termination located under an eave, the

distance of the overhang must not exceed 24". The

clearance to combustibles above the exterior vent must

be maintained at a minimum of 12". Consult the National

Fuel Gas Code for additional requirements for eaves that

have ventilation openings.

C12. Once venting is complete, proceed to section titled

“Installation - Gas Connections”.

Section D - Concentric Vent System Installation

D1. This section applies to both horizontally and vertically

vented concentric vent systems as defined in “Section A –

General Instructions – All Units”, and is in addition to the

instructions in that section.

D2. When utilizing the concentric vent option, it should have

been predetermined whether the appliance will be

horizontally or vertically vented. Before proceeding, verify

that the concentric vent kit received contains the correct

components for the installation:

For Vertically Vented Units (Refer to Figure 9.2):

 Concentric adapter assembly (same for horizontal and

vertical kits)

 Standard listed vent cap

 Specially designed inlet terminal

For Horizontally Vented Units (Refer to Figure 9.3):

 Concentric adapter assembly (same for horizontal and

vertical kits)

 Special vent termination cap

 Special inlet air guard

INSTALLATION - VENTING

METAL

SLEEVE

FIBER GLASS

INSULATION

MIN. 2"

2" MIN.

VENT TERMINATION

SUPPORT BRACKET

(where required)

(Make from 1" x 1" steel angle)

METAL

SLEEVE

2" MIN.

VENT PIPE

DIAMETER

METAL FACE

PLATE

Figure 9.1 - Exhaust Vent Construction Through

Combustible Walls and Support Bracket

Figure 9.2 - Vertical Concentric Vent Kit Components

Combustion Air

Inlet Terminal

Outlet Vent

Termination Cap

Building

Roof / Ceiling

Concentric

Vent Adapter

Box

Combustion Air Exhaust

6" Min.

12" Min.*

* Size according

to expected

snow depth.

CAUTION

The concentric vent adapter box must be installed inside of

the structure or building. Do not install this box on the exterior

of a building or structure.

D3. Once the kit contents have been verified as correct for the

direction of venting, the concentric vent adapter box is to

be installed. Determine the location of the box. Be sure to

maintain all clearances as listed in these instructions.

D4. The adapter box is to be mounted on the interior side of

the building. It must not be mounted outside the building.

The adapter box has integral mounting holes for ease of

installation.

D5. The adapter box can be mounted flush to the wall (for

horizontal kits) or to the ceiling (for vertical kits). The box

can also be offset from the wall or ceiling by using field

supplied brackets. When mounting the box, consider

serviceability and access to the vent and combustion air

pipes. If the box is to be mounted using field supplied

brackets, these brackets must be strong enough to rigidly

secure the box to the wall or ceiling, and should be made

from corrosion resistant material.

D6. Determine the length of the vent pipe and combustion air

inlet pipe for the selected location. THE VENT PIPE WILL

PASS THROUGH THE CONCENTRIC VENT BOX. THE

LAST SECTION OF VENT PIPE IS A CONTINUOUS

LENGTH OF DOUBLE WALL “B” VENT. See section A12

for attaching and terminating double wall pipe. Begin with

pipe lengths on the concentric pipe side of the adapter box,

referring to Figure 10.1. These pipes will extend through the

building wall or roof as well as any added length for the

thickness of the wall and the offset from any field installed

brackets.

Figure 9.3 - Horizontal Concentric Vent Kit

Components

6-561.12

INSTALLATION - VENTING

For Vertical Concentric Vent Kits

(Refer to Figure 9.2):

• The bottom of the combustion air intake pipe must

terminate above the snow line, or at least 12" above

the roof, whichever distance is greater.

• The bottom of the vent cap must terminate at least 6"

above the top of the combustion air intake cap.

For Horizontal Concentric Vent Kits

(Refer to Figure 9.3):

• The combustion air intake pipe must terminate at least

1" from the wall to prevent water from running down the

wall and into the pipe.

• The back of the vent cap must terminate at least

14" from the combustion air intake pipe.

D7. Cut the concentric side vent and combustion air pipes to

the proper length as determined in the previous step. See

Table 10.1 for combustion air and vent pipe sizes. The

pipes must be single wall galvanized or stainless steel

material, except for the last section of vent pipe, which

must be one continuous length of double wall B-vent

extended through the concentric vent box and combustion

air inlet pipe on the concentric side of the box.

NOTE - No clearance to combustible material is required

for the building penetration, which should be sized according

to the external combustion air Inlet pipe diameter.

D8. Allow the concentric side vent pipe to pass through the

concentric vent adapter box, as shown in Figure 10.1.

Attach the double wall vent pipe to the single wall vent

pipe that goes to the unit. Be sure to seal the joint and the

open area around the double wall vent. Seal all joints and

seams using sealant suitable for temperatures up to 400°F.

D9 Slide the combustion air pipe over the vent pipe and

attach to the air inlet of the concentric adapter box, as

shown in Figure 10.1, using at least 3 corrosion-resistant

sheet metal screws. Seal the joint and seam using sealant

suitable for temperatures up to 400°F.

D10. Place this assembly (the adapter box, vent pipe and

combustion air pipe) through the wall or roof and verify

that the distance requirements as defined in Step D7 are

met. Securely attach the assembly to the building.

D11. From outside the building, caulk the gap between the

combustion air intake pipe and the building penetration.

D12. Attach the combustion air intake and vent pipe

terminations as follows:

Figure 10.1 - Adapter Box with Combustion Air Intake Pipe

Attached

Table 10.1 - Concentric Vent Pipe Sizes

Figure 10.2 - Adapter Box Exploded Assembly

Outlet Vent

Pipe Extended

Through Box

Combustion Air

Pipe Attached

For Vertical Concentric Vent Kits

(Refer to Figure 9.2):

• Slide the combustion air cap down over the vent pipe

and fasten it to the combustion air pipe with at least

3 corrosion-resistant sheet metal screws.

• Attach the vent cap to the vent pipe using at least

3 corrosion-resistant sheet metal screws. Refer to

instruction A11 for connecting terminal to double wall

pipe.

• Caulk the gap between the combustion air cap and the

vent pipe with silicone sealant, or other appropriate

sealants suitable for metal to metal contact and for

temperatures up to 400° F.

For Horizontal Concentric Vent Kits

(Refer to Figure 9.3):

• Attach the combustion air intake guard using corrosion-

resistant screws at the end of the combustion air intake

pipe to prevent animals and debris from entering.

• Attach the vent cap to the vent pipe using at least

3 corrosion-resistant sheet metal screws.

D13. Install vent pipe and combustion air pipe between unit

heater and concentric vent adapter box as outlined in

“Section A – General Instructions – All Units”.

D14. Once venting is complete, proceed to the section titled

“Installation - Gas Connections”.

4.57"

Model Sizes A B

150-200 13.33" 18.84"

250-400 17.00" 15.27"

Single Wall Pipe

Type B Vent Pipe 

Model Size

Combustion Air (To

Unit)

Combustion Air

(External)

Vent

(Pass-Through)

150-200

4" 6" 4"

250-400

6" 8" 6"

 B-Vent must have 1/4" air gap (OD is 1/2" larger than ID).

6-561.12

INSTALLATION - GAS CONNECTIONS

GAS CONNECTIONS

1. Installation of piping must conform with local building codes,

or in the absence of local codes, with the National Fuel Gas

Code, ANSI Z223.1 (NFPA 54) - latest Edition. In Canada,

installation must be in accordance with CSA-B149.1.

2. Piping to units should conform with local and national

requirements for type and volume of gas handled, and

pressure drop allowed in the line. Refer to Table 11.1 to

determine the cubic feet per hour (CFH) for the type of gas

and size of unit to be installed. Using this CFH value and the

length of pipe necessary, determine the pipe diameter from

Table 11.2. Where several units are served by the same

main, the total capacity, CFH and length of main must be

considered. Avoid pipe sizes smaller than 1/2". Table 11.2

allows for a 0.3" W.C. pressure drop in the supply pressure

from the building main to the unit. The inlet pressure to the

unit must be 6-7" W.C. for natural gas and 11-14" W.C. for

propane gas. When sizing the inlet gas pipe diameter, make

sure that the unit supply pressure can be met after the

0.3" W.C. has been subtracted. If the 0.3" W.C. pressure

drop is too high, refer to the Gas Engineer’s Handbook for

other gas pipe capacities.

3. Install a ground joint union with brass seat and a manual

shut-off valve adjacent to the unit for emergency shut-off and

easy servicing of controls, including a 1/8" NPT plugged

tapping accessible for test gauge connection (see Figure 11.1).

4. Use 2 wrenches when connecting field piping to units.

5. Provide a sediment trap before each unit in the line where

low spots cannot be avoided (see Figure 11.1).

6. When pressure/leak testing, pressures above 14" W.C.

(1/2 psi), close the field installed shut-off valve, disconnect

the appliance and its combination gas control from the gas

supply line, and plug the supply line before testing. When

testing pressures 14" W.C. (1/2 psi) or below, close the

manual shut-off valve on the appliance before testing.

Figure 11.1 - Recommended Sediment Trap/Manual Shut-off

Valve Installation - Side or Bottom Gas Connection 

 Manual shut-off valve is in the

“OFF” position when handle is

perpendicular to pipe.

Pipe Length

(ft)

Natural Gas

1/2" 3/4" 1" 1-1/4" 1-1/2" 2"

10 132 278 520 1050 1600 3050

20 92 190 350 730 1100 2100

30 73 152 285 590 890 1650

40 63 130 245 500 760 1450

50 56 115 215 440 670 1270

60 50 105 195 400 610 1150

70 46 96 180 370 560 1050

80 43 90 170 350 530 930

100 38 79 150 305 460 870

125 34 72 130 275 410 780

150 31 64 120 250 380 710

Table 11.2 - Gas Pipe Capacities - Natural Gas ➀ 

 Capacities in cubic feet per hour through schedule 40 pipe with maximum

0.3" W.C. pressure drop with up to 14" W.C. gas pressure. Specific gravity is 0.60

for natural gas and 1.50 for propane gas.

 For pipe capacity with propane gas, divide natural gas capacity by 1.6. Example:

What is the propane gas pipe capacity for 60 feet of 1-1/4" pipe? The natural gas

capacity is 400 CFH. Divide by 1.6 to get 250 CFH for propane gas.

Table 11.1 - Sea Level Manifold Pressure

& Gas Consumption

Natural Propane

Model

Size

Manifold Pressure

("W.C.):

3.5 10

# of

Orifices

150

CFH 142.9 60.0

6Gal/Hr.Propane n/a 1.6

Orice Drill Size 42 53

175

CFH 166.7 70.0

7Gal/Hr.Propane n/a 1.9

Orice Drill Size 42 53

200

CFH 190.5 80.0

Gal/Hr.Propane n/a 2.2

Orice Drill Size 38 52

250

CFH 238.1 100.0

9Gal/Hr.Propane n/a 2.7

Orice Drill Size 39 1.55 mm

300

CFH 285.7 120.0

Gal/Hr.Propane n/a 3.3

Orice Drill Size 36 51

350

CFH 333.3 140.0

12Gal/Hr.Propane n/a 3.8

Orice Drill Size 38 52

400

CFH 381.0 160.0

12Gal/Hr.Propane n/a 4.4

Orice Drill Size 36 51

1. All field gas piping must be pressure/leak tested prior to

operation. Never use an open flame. Use a soap solution

or equivalent for testing.

2. Gas pressure to appliance controls must never exceed

14" W.C. (1/2 psi).

3. To reduce the opportunity for condensation, the minimum

sea level input to the appliance, as indicated on the serial

plate, must not be less than 5% below the rated input, or

5% below the minimum rated input of dual rated units.

CAUTION

1. Purging of air from gas lines should be performed as

described in the National Fuel Gas Code, ANSI Z223.1

(NFPA 54) - latest edition or in Canada CSA-B149 codes.

2. When leak testing the gas supply piping system, the

appliance and its combination gas control must be isolated

during any pressure testing in excess of 14" W.C. (1/2 psi).

3. The unit should be isolated from the gas supply piping

system by closing its field installed manual shut-off

valve. This manual shut-off valve should be located within

6' of the heater.

4. Turn off all gas before installing appliance.

To prevent premature heat exchanger failure, the input to

the appliance, as indicated on the serial plate, must not

exceed the rated input by more than 5%.

ARNING

IMPOR

ANT

6-561.12

INSTALLATION - HIGH ALTITUDE ACCESSORY KIT

HIGH ALTITUDE ACCESSORY KIT

Altitude (ft)

Gas Heating Values at Altitude (BTU/ft

)

USA Canada

0-2,000

1,050 1,050

2,001-3,000

929

945

3,001-4,000

892

4,001-4,500

874

4,501-5,000

856 856

5,001-6,000

822 822

6,001-7,000

789 789

7,001-8,000

757 757

8,001-9,000

727 727

9,001-10,000

698 698

Altitude (ft)

Gas Heating Values at Altitude (BTU/ft

)

USA Canada

0-2,000

2,500 2,500

2,001-3,000

2,212

2,250

3,001-4,000

2,123

4,001-4,500

2,080

4,501-5,000

2,038 2,038

5,001-6,000

1,957 1,957

6,001-7,000

1,879 1,879

7,001-8,000

1,803 1,803

8,001-9,000

1,731 1,731

9,001-10,000

1,662 1,662

Table 12.1 - Natural Gas Heating Values at

Altitude ➀ ➂ ➃

Table 12.2 - Propane Gas Heating Values at Altitude ➁ ➂ ➃

Modine’s gas-fired equipment standard input ratings are

certified by ETL. For elevations above 2,000', ANSI Z223.1

requires ratings be reduced 4 percent for each 1000' above sea

level. For units in Canada, CSA requires that ratings be reduced

10 percent at elevations above 2,000'. The high altitude

adjustment instructions and pressure switch kits listed in this

manual are for use with units that will be installed over 2,000'.

These methods and kits comply with both ANSI Z223.1 and

CSA requirements.

If a unit is to be installed at higher elevations AND converted from

natural gas to propane gas operation, a propane conversion kit

must be used in conjunction with the pressure adjustment

methods and pressure switch kits listed herein. For the selection

and installation instructions for propane conversion kits, please

see the latest revision of Modine Manual 75-515.

Selection of the Proper Pressure and Kit

To determine the proper manifold pressure at altitude and if

required, the proper combustion air pressure switch kit, the full

model number of the heater, the fuel to be used, and the

altitude the unit will be installed at must be known. Refer to

the unit serial plate or carton label to obtain the necessary

information about the unit.

After obtaining this information, refer to the gas pressure and

selection charts shown in Tables 12.1 through 12.3. The

pressure charts are differentiated by elevation, fuel type, and

country the product is being installed in. The selection charts

are differentiated by product type, altitude and fuel type. If

converting from natural gas to propane gas and operation at high

altitude, both a propane conversion kit and a pressure switch kit must

be used (if applicable). Selection charts include the proper kit

suffix, when required.

Manifold Pressure Adjustment

The inlet pressure to the unit must be confirmed to be within

acceptable limits (6-7" W.C. for natural gas and 11-14" W.C.

for propane gas) before opening the shutoff valve or the

combination gas valve may be damaged.

Heaters for use with natural gas have gas valves that need to

be field set at 3.5” W.C. manifold pressure at 7.0” W.C. inlet

pressure.

Units for use with propane gas need to be field set for 10.0”

W.C. manifold pressure at 14.0” W.C. inlet pressure.

Installation above 2,000' elevation requires adjustment of the

manifold pressure as described.

Derated BTU Content Gas and Manifold Pressure Calculation

Some utility companies may derate the BTU content (heating

value) of the gas provided at altitude to a value other than

1,050 BTU/ft

for natural gas or 2,500 BTU/ft

for propane gas

to allow certain heating appliances to be used with no manifold

pressure adjustments. For this reason it is necessary that the

supplying utility be contacted for detailed information about the

gas type and BTU content (heating value) before operating any

heater. Tables 12.1 and 12.2 show the standard derated heating

values (4% per 1,000' of elevation in the USA and 10% between

2,001' and 4,500' elevation in Canada) of natural and propane

gases at various altitudes. If the utility is supplying gas with

heating values as shown in Tables 12.1 and 12.2, the manifold

pressure should be set to 3.5" W.C for natural gas and

10.0" W.C. for propane gas.

NOTE: Only the high fire gas pressure need be adjusted, low fire

gas pressure should remain the same.

➀ Values shown are for 3.5" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 12.1 to calculate manifold pressure.

➁ Values shown are for 10.0" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 12.1 to calculate manifold pressure.

➂ When installed at altitudes above 2,000', a pressure switch may need to be changed. Refer to Table 12.3 to determine if a switch change is required.

➃ Gas heating values are derated 4% per 1,000' of elevation in the USA and 10% between 2,000' and 4,500' elevation in Canada in accordance with ANSI Z223.1

and CSA-B149, respectively.

Table 12.3 - High Altitude Kits for PTS/BTS ➀

Model Size Details

U.S.A. and Canada

0-2,000 ft. 2,001-4,500 ft. 4,501-5,500 ft. 5,501-6,500 ft. 6,501-7,500 ft.

150-250

Kit Suffix

Not Required Label Only Label Only Label Only Label Only

Item Code

300

Kit Suffix

Not Required Label Only Label Only

0008 0008

Item Code 68412 68412

350

Kit Suffix

Not Required Label Only Label Only Label Only Label Only

Item Code

400

Kit Suffix

Not Required

0009 0009 0009 0009

Item Code 68413 68413 68413 68413

➀ For Label Only kits, Modine

part number 5H0807146005

is required to be lled out and

attached to the unit by the

installer. Please contact the

local Modine representative

at 1.866.828.4328 (HEAT).

6-561.12

INSTALLATION - HIGH ALTITUDE ACCESSORY KIT

If the heating value of the gas being supplied is different than the values

shown in Tables 12.1 and 12.2, use the following equation to determine the

appropriate manifold pressure for the altitude and gas heating value being

supplied.

Equation 13.1 - Manifold Pressure for Derated Gas

WHERE:

ACT

= Manifold Pressure (in. W.C.) at Altitude –

Manifold pressure setting for the heater being

installed

BTU

TBL

= BTU/ft

Content of Gas –

Obtained from Tables 12.1 or 12.2 (whichever is

applicable)

BTU

ACT

= BTU/ft

Content of Gas –

Obtained from the local utility company

= Manifold Pressure (in. W.C.), at Sea Level –

Use 3.5" W.C. for natural gas and 10.0" W.C. for

propane gas

NOTE: Only the primary manifold pressure should be adjusted

on units equipped with two-stage or modulating gas controls.

No adjustments to the lowf fire manifold pressure are necessary

on these units.

6-561.12

INSTALLATION - ELECTRICAL CONNECTIONS

ELECTRICAL CONNECTIONS

1. Disconnect power supply before making wiring

connections to prevent electrical shock and equipment

damage.

2. All appliances must be wired strictly in accordance with

wiring diagram furnished with the appliance. Any wiring

different from the wiring diagram could result in a hazard

to persons and property.

3. Any original factory wiring that requires replacement must

be replaced with wiring material having a temperature

rating of at least 105°C.

4. Ensure that the supply voltage to the appliance, as

indicated on the serial plate, is not 5% greater than rated

voltage.

5. When the unit on/off toggle switch is in the “OFF” position,

supply power remains energized at the rear of the switch.

When a factory or field installed motor starting device

such as a relay or contactor are present, supply power

terminals of these components may remain energized

even in the “OFF” position. When providing service on or

near these terminals, de-energize building supply power

to the unit.

CAUTION

Ensure that the supply voltage to the appliance, as indicated

on the serial plate, is not 5% less than the rated voltage.

ARNING

1. Installation of wiring must conform with local building codes, or in

the absence of local codes, with the National Electric Code ANSI/

NFPA 70 - Latest Edition. Unit must be electri cally grounded in

conformance to this code. In Canada, wiring must comply with

CSA C22.1, Part 1, Electrical Code.

2. Two copies of the unit wiring diagram are provided with each unit.

One is located in the side access control compartment and the

other is supplied in the literature packet. Refer to this diagram for

all wiring connections.

3. Make sure all multi-voltage components (motors, transform ers, etc.)

are wired in accordance with the power supply voltage.

4. The power supply to the unit must be protected with a fused or

circuit breaker switch.

5. The power supply must be within 5 percent of the voltage rating

and each phase must be balanced within 2 percent of each other.

If not, advise the utility company.

6. External electrical service connections that must be installed

include:

a. Supply power connection (115, 208, 230, 460, or 575 volts).

b. Connection of thermostats, or any other accessory control

devices that may be supplied (24 volts).

NOTE: All units with supply voltage 208V and greater must use a field

installed step-down transformer, available as a separate accessory.

Refer to Tables 14.1 through 14.4 for additional information on the

required transformer.

7. Refer to Figure 21.1 for the side access control compartment

location.

8. All supply power electrical connections are made in the side access

control compartment of the unit. The low voltage (thermostat and

accessory control devices) can be wired to the terminals in the side

access control compartment. Refer to the wiring diagram for the

terminal location of all low voltage wiring.

9. Separated combustion models include a factory installed on/off

toggle switch. The function of this switch is to disconnect power to

the unit for maintenance or to shut the unit off in warm weather.

Toggle switch is rated at 15amps at 125 volts or up to 3/4 HP at

125 volts.

6-561.12

When installing the heater, always follow good duct design

practices for even distribution of the air across the heat

exchanger. Recommended layouts are shown in Figure 15.1.

When installing blower units with ductwork the following must be

done.

1. Provide uniform air distribution over the heat exchanger. Use

turning vanes where required (see Figure 15.1).

2. Provide removable access panels in the ductwork on the

downstream side of the unit heater. These openings should

be large enough to view smoke or reflect light inside the

casing to indicate leaks in the heat exchanger and to check

for hot spots on exchanger due to poor air distribution or lack

of sufficient air.

3. If ductwork is connected to the rear of the unit use Modine

blower enclosure kit or if using field designed enclosure

maintain dimensions of blower enclosure as shown on

page 23.

Additional Requirements for Installation of Blower Models

(model BTS)

Determining Blower Speed

The drive assembly and motor on gas-fired blower unit heaters

with motors 2HP and below are factory assembled. 3HP and

larger motors are shipped loose to prevent shipping damage.

The adjustable motor sheave has been pre-set to permit

operation of this unit under average conditions of air flow and

without any external static pressure. The motor sheave should

be adjusted as required when the unit is to be operated at other

than average air flows and/or with external static pressures.

Adjustment must always be within the performance range

shown on page 22 and the temperature rise range shown on

the unit’s rating plate.

INSTALLATION WITH DUCTWORK

BAFFLE

30,5 CM

MIN.

CLOISO N

AILE TTES

ROTATIVES

12" MIN.

3" MAX .

TUR NING

VANES

3" MIN.

12"

MIN.

3" MAX.

TUR NING

VANES

12"

BAFFLE

12"

MIN.

BAFFLE

TURNING

VANES

30,5 CM

MIN.

AILE TTES

ROTATIVES

Recommended Installations

SIDE VIEW SIDE VIEW

TOP VIEW

SIDE VIEW SIDE VIEW TOP VIEW

Dimension “B” Should Never

Be Less than 1/2 of “A”

CBA

FED

Figure 15.1- Typical Duct & Airflow Installation

To determine the proper blower speed and motor sheave turns

open, the conditions under which the unit is to operate must be

known. If the blower unit is to be used without duct work or

filters, the only criteria for determining the motor sheave turns

open and blower speed is the amount of air to be delivered. The

performance tables for blower models are shown on pages 18

and 19. As an example, a model BTS 350 unit, operating with

no external static pressure, that is, no duct work, filters, etc.,

and is to deliver an air volume of 6481 cfm (cfm = cubic feet of

air per minute) requires that the unit be supplied with a 5 hp

motor, a -207 drive, and the drive sheave must be set at

2.5 turns open to achieve a blower speed of 960 rpm (see

performance table for units with or without blower enclosure,

page 19). See “Blower Adjustments” on page 16 for setting of

drive pulley turns open.

If a blower unit is to be used with ductwork or filters, etc., the

total external static pressure under which the unit is to operate,

and the required air flow must be known before the unit can be

properly adjusted.

If Modine filters are used, the expected pressure loss through

the filters is included in the performance data on page 17. If

filters or ductwork are to be used with the unit, and they are not

supplied by Modine, the design engineer or installing contractor

must determine the pressure loss for the externally added

devices or ductwork to arrive at the total external static pressure

under which the unit is to operate.

Once the total static pressure and the required air flow are

known, the operating speed of the blower can be determined

and the correct motor sheave adjustments made. As an

example, a model BTS 350 is to be used with a Modine

supplied blower enclosure and Modine supplied filters attached

to ductwork. The unit is to move 6481 cfm of air flow against an

external static pressure of 0.2" W.C. Also, 0.2" W.C. must be

added for the filter pressure drop for a total of 0.4" W.C. total

pressure drop. Entering the performance table on page 18 for a

BTS 350, at 6481 cfm and 0.4" W.C. static pressure, it is seen

that the unit will require a 5 hp motor using a -207 drive, and

the motor sheave should be set at .5 turns open to achieve a

blower speed of 1050 rpm. You can see this example differs

from similar conditions in paragraph 2 by the number of turns

open and a higher rpm, which is needed to overcome the added

external static pressure from the filters.

Do not attempt to attach ductwork of any kind to propeller

models.

IMPOR

ANT

6-561.12

To Install

1. Remove and discard the motor tie down strap and the

shipping block beneath the motor adjustment screw (not used

on all models.)

2. For 3 and 5 HP motors, affix sheave to the motor shaft and

install motor on the motor mounting bracket. Install belt on

blower and motor sheaves.

TOWARD MOTOR

SE T SC REW

AD JUSTABLE HALF

OF SHEAVE

3/4" DEFLECTION

WITH 5 LBS. FORC

INSTALLATION

Figure 16.2 - Motor Sheave Adjustment

Figure 16.3 - Belt Tension Adjustment

Figure 16.1 - Blower Model

MOUNTING BRACKETS ON BLOWER

ASSEMBLY

ADJUSTABLE

MOTOR SHEAVE

BLOWER

HOUSING

MOTOR

ADJUSTMENT

SCREW

MOTOR MOUNTING

BRACKET

BLOWER

SHEAVE

3. Adjust motor adjusting screw for a belt deflection of

approximately 3/4" with 5 pounds of force applied midway

between the sheaves (refer to Figure 16.3). Since the belt

tension will decrease dramatically after an initial run-in period,

it is necessary to periodically re-check the tension. Excessive

tension will cause bearing wear and noise.

4. The blower bearings are lubricated for life; however, before

initial unit operation the blower shaft should be lubricated at

the bearings with SAE 20 oil. This will reduce initial friction

and start the plastic lubricant flowing.

5. Make electrical connections according to the wiring diagram.

6. Check rotation of the blower. Motor should be in clockwise

rotation when facing motor pulley. If rotation is incorrect,

correction should be made by interchanging wiring within the

motor. See wiring diagram on the motor.

7. The actual current draw of the motor should be determined.

Under no condition should the current draw exceed that

shown on the motor rating plate.

8. It is the installer’s responsibility to adjust the motor sheave to

provide the specified blower performance as listed on pages

18 & 19 for blower settings different from the factory set

performance. The drive number on the unit may be identified

by referring to the Power Code number on the serial plate of

the unit (see page 27 for model number nomenclature) and

matching that number with those shown on page 17. From

the listing, the drive number can be determined.

Blower Adjustments

Following electrical connections, check blower rotation to assure

blow-through heating. If necessary interchange wiring to reverse

blower rotation. Start fan motor and check blower sheave RPM

with a hand-held or strobe-type tachometer. RPM should check

out with the speeds listed in performance data shown on pages

18 and 19. A single-speed motor with an adjustable motor

sheave is supplied with these units. If blower fan speed

changes are required, adjust motor sheave as follows:

NOTE: Do not fire unit until blower adjustment has been made or unit

may cycle on limit (overheat) control.

1. Shut-off power before making blower speed

adjustments. Refer to “Determining Blower Speed” on

page 15 and to “Performance Data” on pages 18 and 19 to

determine proper blower RPM.

2. Loosen belt and take belt off of motor sheave.

3. Loosen set screw on outer side of adjustable motor sheave

(see Figure 16.2).

4. To reduce the speed of the blower, turn outer side of motor

sheave counterclockwise.

5. To increase the speed of the blower, turn outer side of motor

sheave clockwise.

6. Retighten motor sheave set screw, replace belt and

retighten motor base. Adjust motor adjusting screw such

that there is 3/4" belt deflection when pressed with 5 pounds

of force midway between the blower and motor sheaves

(see Figure 16.3). Since the belt tension will decrease

dramatically after an initial run-in period, it is necessary to

periodically re-check the tension to assure continual proper

belt adjustment.

7. Check to make certain motor sheave and blower sheave are

aligned. Re-align if necessary.

8. Re-check blower speed after adjustment.

9. Check motor amps. Do not exceed amps shown on motor

nameplate. Slow blower if necessary.

10. Check air temperature rise across unit. Check temperature

rise against values shown in performance tables on pages

18 and 19 to assure actual desired air flow is being achieved.

11. If adjustments are required, recheck motor amps after final

blower speed adjustment.

6-561.12

BLOWER PERFORMANCE DATA - MODEL BTS

Table 17.1 - Power Code Description - Blower Model BTS - 

Table 17.2 - Filter Static Pressure Drop 

BTS150 BTS175 BTS200 BTS250 BTS300 BTS350 BTS400

Filter Static ("W.C.) 0.1 0.2 0.1 0.2 0.2 0.2 0.2

 For blower units with enclosure and lter, add the following static pressures to the static pressure determined by the system designer for total

external static pressure.

Power

Code

Voltage Phase

BTS150 BTS175 BTS200 BTS250 BTS300 BTS350 BTS400

HP Drive HP Drive HP Drive HP Drive HP Drive HP Drive HP Drive

115 1 1/4 230 - - - - - - - - - - - -

115/230 1 1/3 230 1/3 238 1/2 233 1/2 204 1 240 1 1/2 250 1 1/2 247

208-230/460 3 1/3 230 1/3 238 1/2 233 1/2 204 1 257 1 1/2 251 1 1/2 248

575 3 1/3 231 1/3 239 1/2 233 1/2 204 1 257 1 1/2 251 1 1/2 248

115/230 1 1/3 232 1/2 229 1 229 1 241 1 241 1 1/2 247 - -

208-230/460 3 1/3 232 1/2 229 1 259 1 258 1 258 1 1/2 248 2 177

575 3 1/3 233 1/2 229 1 259 1 258 1 258 1 1/2 248 2 177

115/230 1 1/2 229 1 175 1 175 1.5 23 1 1/2 243 1 1/2 252 - -

208-230/460 3 1/2 229 1 253 1 253 1.5 177 1 1/2 244 1 1/2 180 3 246

575 3 1/2 229 1 253 1 253 1.5 177 1 1/2 244 1 1/2 180 3 246

115/230 1 1 175 1 1/2 237 1 1/2 235 - - 1 1/2 23 - - - -

208-230/460 3 1 253 1 1/2 234 1 1/2 236 2 180 1 1/2 177 2 177 5 245

575 3 1 253 1 1/2 234 1 1/2 236 2 180 1 1/2 177 2 177 5 245

208-230/460 3 - - - - - - - - 2 177 2 180 - -

575 3 - - - - - - - - 2 177 2 180 - -

208-230/460 3 - - - - - - - - 3 112 3 246 - -

575 3 - - - - - - - - 3 112 3 246 - -

208-230/460 3 - - - - - - - - - - 5 245 - -

575 3 - - - - - - - - - - 5 245 - -

 For selection of correct power code, refer to the tables on pages 18-19.

6-561.12

BLOWER PERFORMANCE DATA - MODEL BTS

Table 18.1 - Blower Model BTS 150-250 (40-55°F temp rise for 250 size unit) -   

Table 18.2 - Alternate

Drives for 208-

230/460V

3 Ph, 1 HP Motors

Table 18.3 - Alternate

Drives for 208-

230/460V 3 Ph, 1-1/2

HP Motors

Table 18.4 - Alternate

Drives for 575V

External Static Pressure ("W.C.)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Model Size ATR CFM HP RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns HP

150

40 2778 1

573 175 4.5 615 175 4.0 658 175 3.0 699 175 2.5 738 175 1.5 775 175 1.0 810 175 0.5 - - -

45 2469

1/2

510

229 4.0

558

229 3.0

606

- -

650

- -

692

- -

731

- -

769

- -

806

- -

1/2

- - 175 4.5 175 4.0 175 3.0 175 2.5 175 2.0 175 1.0 175 0.5

50 2222

1/3

460

232 4.0

513

- -

565

- -

612

- -

656

- -

699

- -

739

- -

779

- -

1/3

230 1.0 - - - - - - - - - - - - - -

1/2

229 5.0 229 4.0 229 3.0 229 2.0 - - - - - - - -

1/2

- - - - 175 4.5 175 4.0 175 3.0 175 2.5 175 1.5 175 1.0

55 2020

1/4➁

418

230 2.5

477

- -

532

- -

582

- -

629

- -

674

- -

717

- -

759

- -

1/4

1/3

232 5.0 232 3.5 232 2.0 - - - - - - - - - -

1/3

230 2.5 230 0.5 - - - - - - - - - - - -

1/2

- - 229 5.0 229 3.5 229 2.5 229 1.5 229 1.0 - - - -

1/2

- - - - 175 5.0 175 4.5 175 3.5 175 3.0 175 2.0 175 1.0

60 1852

1/4➁

384

230 3.5

448

230 1.5

506

- -

559

- -

609

- -

656

- -

701

- -

741

- -

1/4

1/3

- - 232 4.0 232 2.5 232 1.5 - - - - - - - -

1/3

230 3.5 230 1.5 230 0.0 - - - - - - - - - -

1/2

- - - - 229 4.0 229 3.0 229 2.0 229 1.0 229 0.5 - -

1/2

- - - - - - 175 5.0 175 4.0 175 3.0 175 2.5 175 1.5

65 1709

1/4➁

354

230 4.0

423

230 2.0

485

230 0.5

540

- -

592

- -

642

- -

690

- -

735

- -

1/4

1/3

230 4.0 232 4.5 232 3.0 232 2.0 232 1.0 - - - - - -

1/3

1/2

- - - - 229 4.5 229 3.5 229 2.5 229 1.5 229 0.5 - -

1/2

- - - - - - 175 5.0 175 4.0 175 3.5 175 2.5 175 1.5

70 1587

1/4➁

329

230 5.0

403

230 3.0

467

230 1.0

525

- -

580

- -

635

- -

680

- -

722

- -

1/4

1/3

230 5.0 232 5.0 232 3.5 232 2.5 232 1.0 232 0.0 - - - -

1/3

1/2

- - - - 229 5.0 229 4.0 229 2.5 229 1.5 229 0.5 229 0.0

1/2

- - - - - - - - 175 4.5 175 3.5 175 2.5 175 2.0

175

40 3241

625

175 3.5

655

175 3.0

690

175 2.5

727

- -

764

- -

799

- -

834

- -

866

- -

1-1/2

- - - - - - 237 5.0 237 4.5 237 3.5 237 2.5 237 2.0

1-1/2

45 2881

555

175 5.0

589

175 4.5

630

175 3.5

672

175 3.0

712

175 2.0

750

175 1.5

786

- -

821

- -

1-1/2

- - - - - - - - - - 237 4.5 237 4.0 237 3.0

1-1/2

50 2593

1/2

500

229 4.5

538

229 3.5

584

- -

630

- -

673

- -

713

- -

751

- -

788

- -

1/2

- - 175 5.0 175 4.5 175 3.5 175 3.0 175 2.0 175 1.5 175 0.5

1-1/2

- - - - - - - - - - - - 237 4.5 237 4.0

1-1/2

55 2357

1/3

454

238 2.5

497

- -

548

- -

597

- -

642

- -

684

- -

724

- -

763

- -

1/3

1/2

229 5.0 229 4.5 229 3.5 229 2.5 - - - - - - - -

1/2

- - - - 175 5.0 175 4.0 175 3.5 175 2.5 175 2.0 175 1.0

1-1/2

- - - - - - - - - - - - 237 5.0 237 4.5

1-1/2

60 2160

1/3

416

238 4.0

464

238 2.5

520

- -

571

- -

618

- -

662

- -

705

- -

745

- -

1/3

1/2

- - 229 5.0 229 4.0 229 3.0 229 2.0 229 1.0 - - - -

1/2

- - - - - - 175 4.5 175 4.0 175 3.0 175 2.0 175 1.5

1-1/2

- - - - - - - - - - - - - - 237 4.5

1-1/2

65 1994

1/3

384

238 4.5

438

238 3.0

497

238 1.5

550

238 0.0

599

- -

645

- -

690

- -

733

- -

1/3

1/2

- - - - 229 4.5 229 3.5 229 2.5 229 1.5 229 0.5 - -

1/2

- - - - - - 175 5.0 175 4.0 175 3.5 175 2.5 175 1.5

1-1/2

- - - - - - - - - - - - - - 237 5.0

1-1/2

70 1852

1/3

356

238 5.0

415

238 3.5

477

238 2.0

533

238 0.5

584

- -

632

- -

678

- -

728

- -

1/3

1/2

- - - - 229 5.0 229 3.5 229 2.5 229 1.5 229 1.0 - -

1/2

- - - - - - - - 175 4.5 175 3.5 175 3.0 175 2.0

200

40 3704 1-1/2

715 235 3.5 741 235 2.5 770 235 2.0 - - - - - - - - - - - - - - -

1-1/2

45 3292

635

175 3.5

665

175 3.0

698

- -

735

- -

772

- -

807

- -

841

- -

873

- -

229 1.5 229 1.0 - - - - - - - - - - - -

1-1/2

235 5.0 235 3.0 235 4.0 235 3.0 235 2.0 235 1.0 235 0.0 - -

1-1/2

50 2963

571

175 4.5

604

175 4.0

643

175 3.5

684

175 2.5

723

175 2.0

761

175 1.5

797

- -

831

- -

229 3.0 229 2.5 229 1.5 229 0.5 229 0.0 - - - - - -

1-1/2

- - - - 235 5.0 235 4.0 235 3.0 235 2.0 235 1.5 235 0.5

1-1/2

55 2694

1/2

519

233 2.5

556

- -

600

- -

644

- -

686

- -

725

- -

763

- -

799

- -

1/2

- - 175 5.0 175 4.0 175 3.5 175 2.5 175 2.0 175 1.0 175 0.5

229 4.0 229 3.0 229 2.5 229 1.5 229 0.5 229 0.0 - - - -

1-1/2

- - - - - - 235 5.0 235 4.0 235 3.0 235 2.0 235 1.0

1-1/2

60 2469

1/2

475

233 2.5

516

233 2.5

565

233 1.5

612

- -

656

- -

697

- -

736

- -

774

- -

1/2

- - - - 175 4.5 175 4.0 175 3.0 175 2.5 175 1.5 175 1.0

229 5.0 229 4.0 229 3.0 229 2.0 229 1.0 229 0.5 - - - -

1-1/2

- - - - - - - - 235 5.0 235 4.0 235 3.0 235 2.0

1-1/2

65 2279

1/2

439

233 4.5

484

233 3.5

537

233 2.0

586

233 1.0

632

233 0.0

675

- -

716

- -

756

- -

1/2

- - - - 175 5.0 175 4.5 175 3.5 175 2.5 175 2.0 175 1.5

- - 229 4.5 229 3.5 229 2.5 229 1.5 229 1.0 229 0.0 - -

1-1/2

- - - - - - - - - - 235 4.5 235 3.5 235 2.5

1-1/2

70 2116

1/2

407

233 5.0

457

233 4.0

513

233 2.5

565

233 1.5

612

233 0.5

657

- -

700

- -

742

- -

1/2

- - - - - - 175 4.5 175 4.0 175 3.0 175 2.5 175 1.5

- - 229 5.0 229 4.0 229 3.0 229 2.0 229 1.0 229 0.5 - -

1-1/2

- - - - - - - - - - 235 5.0 235 3.5 235 2.5

1-1/2

250

40 4630

1-1/2

542

23 4.5

569

23 4.0

599

23 3.0

629

- -

658

- -

688

- -

716

- -

744

- -

1-1/2

- - - - 180 4.5 180 4.0 180 3.0 180 2.0 180 1.5 180 0.5

45 4115

482

241 3.5

513

241 2.5

546

- -

580

- -

613

- -

645

- -

675

- -

704

- -

1-1/2

- - - - 23 4.5 23 3.5 23 2.5 23 1.5 23 0.5 - -

1-1/2

- - - - - - 180 5.0 180 4.5 180 3.5 180 2.5 180 1.5

50 3704

433

241 4.5

468

241 3.5

506

241 3.0

543

241 2.0

578

241 1.0

612

- -

644

- -

674

- -

1-1/2

- - - - - - 23 4.5 23 3.5 23 2.5 23 1.5 23 0.5

1-1/2

- - - - - - - - 180 5.0 180 4.5 180 3.5 180 2.5

55 3367

1/2

394

204 3.0

432

- -

474

- -

513

- -

551

- -

586

- -

620

- -

652

- -

1/2

241 5.0 241 4.5 241 3.5 241 2.5 241 1.5 241 1.0 241 0.0 - -

1-1/2

- - - - - - - - 23 4.5 23 3.5 23 2.0 23 1.0

1-1/2

- - - - - - - - - - 180 5.0 180 4.0 180 3.0

➀ Outputs shown are for

elevations up to 2000'.

For elevations over

2000’, output needs to

be reduced 4% for

each 1000' above sea

level. (Does not apply in

Canada - see rating plate).

➁ Sheave turns open

are approximate.

For proper operation,

check blower rpm.

➂ For 230/460V (1 HP and

1-1/2 HP) or 575V

selections, see Tables

18.2, 3, & 4 for the

corrected drive number.

Model

1 HP Drive

Listed

1 HP Drive

for 230/460V

BTS150

175 = 253

BTS175

175 = 253

BTS200

175 = 253

229 = 259

BTS250

241 = 258

Model

1-1/2 HP Drive

Listed

1-1/2 HP Drive for

230/460V

BTS150

- = -

BTS175

237 = 234

BTS200

235 = 236

BTS250

23 = 177

Model

Drive for Under

575V Drive for 575V

BTS150

175 = 253

230 = 231

232 = 233

BTS175

175 = 253

237 = 234

238 = 239

BTS200

175 = 253

229 = 259

235 = 236

BTS250

23 = 177

241 = 258

6-561.12

BLOWER PERFORMANCE DATA - MODEL BTS

Table 19.1 - Blower Model BTS 250-400 (60-70°F temp rise for 250 size unit) - 

Table 19.2 - Alternate

Drives for 208-

230/460V

3 Ph, 1 HP Motors

Table 19.3 - Alternate

Drives for 208-

230/460V 3 Ph, 1-1/2

HP Motors

Table 19.4 - Alternate

Drives for 575V

➀ Outputs shown are for

elevations up to 2000'.

For elevations over

2000’, output needs to

be reduced 4% for

each 1000' above sea

level. (Does not apply in

Canada - see rating plate).

➁ Sheave turns open

are approximate.

For proper operation,

check blower rpm.

➂ For 230/460V (1 HP and

1-1/2 HP) or 575V

selections, see Tables

19.2, 3, & 4 for the

corrected drive number.

Model

1 HP Drive

Listed

1 HP Drive

for 230/460V

BTS300

240 = 257

241 = 258

BTS350

- = -

BTS400

- = -

Model

1-1/2 HP Drive

Listed

1-1/2 HP Drive for

230/460V

BTS300

23 = 177

243 = 244

BTS350

247 = 248

250 = 251

252 = 180

BTS400

247 = 248

250 = 251

252 = 180

Model

Drive for Under

575V Drive for 575V

BTS300

23 = 177

240 = 257

243 = 244

BTS350

247 = 248

250 = 251

252 = 180

BTS400

247 = 248

External Static Pressure ("W.C.)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Model Size ATR CFM HP RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns RPM Drive Turns HP

250

60 3086

1/2

360

204 4.0

403

204 3.0

448

204 1.5

490

- -

530

- -

566

- -

601

- -

635

- -

1/2

- - 241 5.0 241 4.0 241 3.0 241 2.0 241 1.5 241 0.5 241 0.0

1-1/2

- - - - - - - - 23 5.0 23 4.0 23 3.0 23 2.0

1-1/2

- - - - - - - - - - - - 180 4.5 180 2.5

65 2849

1/2

332

204 4.5

379

204 3.5

427

204 2.0

471

204 1.0

512

- -

550

- -

587

- -

622

- -

1/2

- - - - 241 4.5 241 3.5 241 2.5 241 1.5 241 1.0 241 0.0

1-1/2

- - - - - - - - - - 23 4.5 23 3.5 23 2.0

1-1/2

- - - - - - - - - - - - 180 5.0 180 4.0

70 2646

1/2

308

204 5.0

359

204 4.5

410

204 2.5

456

204 1.5

498

204 0.5

538

- -

576

- -

613

- -

1/2

- - - - 241 5.0 241 4.0 241 3.0 241 2.0 241 1.0 241 0.5

1-1/2

- - - - - - - - - - 23 5.0 23 3.5 23 2.5

1-1/2

- - - - - - - - - - - - 180 5.0 180 4.5

300

40 5556 3

650

112 3.0

673

112 2.5

697

112 2.0

721

112 1.0

746

112 0.5

771

112 0.0 - - - - - -

177 1.5 177 0.5 177 0.0 - - - - - - - - - - - -

45 4938

578

177 3.5

604

177 3.0

631

177 2.0

659

177 1.0

687

177 0.0

715

- -

742

- -

768

- -

112 5.0 112 4.5 112 3.5 112 3.0 112 2.0 112 1.5 112 0.5 112 0.0

50 4444

1-1/2

520

23 5.0

549

23 4.5

580

23 3.5

611

23 2.5

642

23 1.5

672

177 0.5

701

177 0.0

729

177 0.0

1-1/2

243 2.5 243 1.5 243 0.0 - - - - - - - - - -

- - - - 112 5.0 112 4.5 112 3.5 112 2.5 112 1.5 112 1.0

55 4040

473

241 3.5

505

241 3.0

538

241 2.0

573

- -

606

- -

638

- -

669

- -

698

- -

240 2.0 240 1.5 240 0.5 - - - - - - - - - -

1-1/2

- - - - 23 5.0 23 3.5 23 2.5 23 1.5 23 0.5 23 0.0

1-1/2

243 4.0 243 3.0 243 1.5 243 0.5 243 0.0 - - - - - -

- - - - - - - - 112 4.5 112 3.5 11 2 2.5 112 2.0

60 3704

433

241 4.5

468

241 3.5

506

241 3.0

543

241 2.0

578

241 1.0

612

- -

644

- -

674

- -

240 3.0 240 2.5 240 1.5 - - - - - - - - - -

1-1/2

- - - - - - 23 4.5 23 3.5 23 2.5 23 1.5 23 0.5

1-1/2

243 5.0 243 4.5 243 3.0 243 1.5 243 0.5 - - - - - -

- - - - - - - - 112 5.0 112 4.5 11 2 3.5 112 2.5

65 3419

400

241 5.0

438

241 4.5

478

241 3.5

518

241 2.5

555

241 1.5

590

241 0.5

623

241 0.0

655

- -

240 4.0 240 3.0 240 2.0 240 1.0 240 0.0 - - - - - -

1-1/2

- - - - - - - - 23 4.0 23 3.0 23 2.0 23 1.0

1-1/2

- - 243 5.0 243 4.0 243 2.5 243 1.0 243 0.0 - - - -

- - - - - - - - - - 112 5.0 112 4.0 112 3.0

70 3175

- - -

412

241 5.0

456

241 4.0

497

241 3.0

536

241 2.0

572

241 1.0

607

241 0.5

640

- -

371 240 5.0 240 4.0 240 2.5 240 1.5 240 0.5 - - - - - -

1-1/2

- - - - - - - - - 23 5.0 23 4.0 23 2.5 23 1.5

1-1/2

- - - - - 243 5.0 243 3.5 243 2.0 243 0.5 243 0.0 - -

- - - - - - - - - - - - - 112 4.5 11 2 3.5

350

40 6481 5

721 245 3.0 739 245 3.0 757 245 2.5 777 245 2.0 797 245 1.0 817 245 0.5 838 245 0.0 860 245 0.0

45 5761

643

246 3.5

662

246 1.0

684

246 2.5

706

246 1.5

729

246 1.0

753

246 0.0

777 801

245 5.0 245 5.0 245 4.0 245 3.5 245 3.0 245 2.5 245 2.0 245 1.0

50 5185

579

180 5.0

602

180 4.5

626

180 4.0

651

180 3.0

678

- -

705

- -

731

- -

757

- -

177 3.5 177 3.0 177 2.0 177 1.0 - - - - - - - -

- - - - - - - - 246 2.5 246 1.5 246 1.0 246 0.0

- - - - - - 245 5.0 245 4.5 245 3.5 245 3.0 245 2.5

55 4714

1-1/2

528

247 3.5

553

247 3.0

580

247 2.0

608

- -

638

- -

667

- -

696

- -

724

- -

1-1/2

250 0.5 250 0.0 252 5.0 - - - - - - - - - -

- - - - - - 180 4.5 180 3.5 180 2.5 180 2.0 180 1.0

177 5.0 177 4.5 177 3.5 177 2.5 177 1.5 177 1.0 177 0.0 177 0.0

- - - - - - - - 245 5.0 245 4.5 245 4.0 245 3.0

60 4321

1-1/2

484

247 5.0

512

247 4.0

542

247 3.0

574

247 2.0

606

247 1.0

637

247 0.0

668

- -

697

- -

1-1/2

250 2.5 250 1.0 250 0.0 252 5.0 252 4.5 252 3.5 252 2.5 - -

- - - - - - - - - - - - - - 180 2.0

- - - - 177 4.5 177 3.5 177 2.5 177 1.5 177 0.5 177 0.0

- - - - - - - - - - 245 5.0 245 4.5 245 4.0

65 3989

1-1/2

448

250 4.0

478

250 2.5

511

250 1.0

546

250 0.0

580

252 5.0

614

252 4.5

645

252 3.5

676

252 2.5

1-1/2

- - 247 5.0 247 4.0 247 3.0 247 2.0 247 0.5 247 0.0 - -

- - - - - - 177 4.5 177 3.5 177 2.5 177 1.5 177 0.5

- - - - - - - - - - - - 245 5.0 245 4.5

70 3704

1-1/2

416

250 5.0

449

250 4.0

485

250 2.5

523

250 1.0

559

- -

594

252 5.0

627

252 4.0

658

252 3.0

1-1/2

- - - - 247 5.0 247 4.0 247 2.5 247 1.5 247 0.0 - -

- - - - - - - - 177 4.0 177 3.0 177 2.0 177 1.0

- - - - - - - - - - - - - - 245 5.0

400

40 7407 5

823 245 0.5 838 245 0.0 - - - - - - - - - - - - - - - - - -

45 6584 5

733 245 3.0 750 245 2.5 768 245 2.0 787 245 1.5 807 245 1.0 827 245 0.5 847 245 0.0 868 245 0.0

50 5926

660

246 3.0

680

246 2.5

700

246 1.5

722

246 1.0

744

246 0.5

767

- -

791

- -

814

- -

245 5.0 245 4.5 245 3.5 245 3.0 245 2.5 245 2.0 245 1.5 245 0.5

55 5387

601

177 3.0

623

177 2.0

646

- -

670

- -

696

- -

721

- -

747

- -

772

- -

246 4.5 246 4.0 246 3.5 246 2.5 246 2.0 246 1.0 246 0.5 - -

- - - - 245 5.0 245 4.5 245 4.0 245 3.0 245 2.5 245 2.0

60 4938

1-1/2

552

247 3.0

576

- -

601

- -

629

- -

656

- -

685

- -

712

- -

740

- -

1-1/2

177 4.5 177 3.5 177 3.0 177 2.0 177 1.0 177 0.0 - - - -

- - 246 5.0 246 4.5 246 4.0 246 3.0 246 2.0 246 1.5 246 0.5

- - - - - - - - 245 5.0 245 4.0 245 3.5 245 2.5

65 4558

1-1/2

510

247 4.5

536

247 3.5

565

247 2.5

594

247 1.0

625

247 0.5

655

- -

684

- -

713

- -

1-1/2

- - 177 5.0 177 4.0 177 3.0 177 2.0 177 1.0 177 0.0 177 0.0

- - - - - - 246 5.0 246 4.0 246 3.0 246 2.0 246 1.5

- - - - - - - - - - 245 5.0 245 4.0 245 3.5

70 4233

1-1/2

475

247 5.0

503

247 4.5

534

247 3.5

566

247 2.5

599

247 1.0

631

247 0.0

662

- -

691

- -

1-1/2

- - - - 177 5.0 177 4.0 177 3.0 177 2.0 177 1.0 177 0.0

- - - - - - - - 246 4.5 246 3.5 246 3.0 246 2.0

- - - - - - - - - - - - 245 4.5 245 4.0

6-561.12

INSTALLATION - OPERATION

Although this unit has been assembled and fire-tested at the

factory, the following pre-operational procedures should be

performed to assure proper on-site operation.

1. Turn off power to the unit at the disconnect switch. Check

that fuses or circuit breakers are in place and sized

correctly. Turn all hand gas valves to the “OFF” position.

2. Remove the side control access panel.

3. Check that the supply voltage matches the unit supply

voltage listed on the Model Identification plate. Verify that all

wiring is secure and properly protected. Trace circuits to

insure that the unit has been wired according to the wiring

diagram. If installed at altitudes above 2,000' and the high

altitude kit includes a combustion air proving switch, replace

the switch in the unit with the switch provided in the kit.

Take care to ensure that the tubing and electrical

connections are securely fastened.

4. Check to insure that the venting system is installed correctly

and free from obstructions. Before you start use the following

steps to verify that the venting system is adequately sized:

a. Seal any unused openings in the venting system.

b. Inspect the venting system for proper size and horizontal

pitch, as required in the National Fuel Gas Code, ANSI

Z223.1 (NFPA 54) or CSA B149.1 Installation Code -

latest edition and these instructions. Determine that there

is no blockage or restriction, leakage, corrosion, or other

deficiencies, which could cause an unsafe condition.

c. Insofar as practical, close all building doors and

windows and all doors between the space in which the

appliance(s) connected to the venting system is (are)

located and other spaces of the building. Turn on clothes

dryers and any exhaust fans such as range hoods and

bathroom exhausts, so they shall operate at maximum

speed. Do not operate a summer exhaust fan. Close

fireplace dampers.

d. Follow the lighting instructions. Place the appliance being

inspected in operation. Adjust thermostat so that the

appliance will operate continuously.

e. After it has been determined that each appliance

connected to the venting system properly vents when

tested as outlined above, return doors, windows, exhaust

fans, fireplace dampers and any other gas-burning

appliance to their previous conditions of use.

f. If improper venting is observed during any of the above

tests, the venting system must be corrected.

5. Check to see that there are no obstructions to the intake

and discharge of the unit.

6. Check fan clearance. Fan should not contact casing when

spun by hand.

7. Check to make sure that all filters are in place and that

they are installed properly according to direction of air flow

(if applicable).

8. Perform a visual inspection of the unit to make sure no

damage has occurred during installation. Check to ensure

all fasteners are in place and the burner openings are

properly aligned with the heat exchanger tubes and that the

gas orifices are centered in the burner inspirator tube opening.

9. Check that all horizontal deflector blades are open a

minimum of 30° as measured from vertical.

1. To prevent premature heat exchanger failure, observe

heat exchanger tubes. If the tubes become red while

blower and furnace are in operation, check to be sure the

blower has been set to the proper rpm for the application.

Refer to page 16 for blower adjustments.

2. Start-up and adjustment procedures must be performed

by a qualified service agency.

OPERATION

Prior to Operation

10. Turn on power to the unit at the disconnect switch.

11. Check the thermostat, ignition control, gas valve, and supply

fan blower motor for electrical operation. If these do not

function, recheck the wiring diagram.

12. Check the blower wheel for proper direction of rotation when

compared to the air flow direction arrow on the blower

housing (if applicable). Blower wheel rotation, not air

movement, must be checked as some air will be delivered

through the unit with the blower wheel running backwards.

13. For blower units, check the blower speed (rpm). Refer to

“Blower Adjustments” for modification.

14. Check the motor speed (rpm).

15. Check the motor voltage.

16. Check the motor amp draw to make sure it does not exceed

the motor nameplate rating.

17. Recheck the gas supply pressure at the field installed

manual shut-off valve. The minimum inlet pressure should

be 6" W.C. on natural gas and 11" W.C. on propane gas.

The maximum inlet pressure for either gas is 14" W.C. If

inlet pressure exceeds 14" W.C., a gas pressure regulator

must be added upstream of the combination gas valve.

18. Open the field installed manual gas shut-off valve.

19. Place the manual main gas valve on the combination gas

valve in the "On" position. Call for heat with the thermostat.

20. Check to make sure that the main gas valve opens. Check

the manifold gas pressure (see “Main Gas Adjustment”)

while the supply fan blower is operating.

21. Check to insure that gas controls sequence properly (see

“Control Operating Sequence”). If you are not familiar with

the unit’s controls (i.e. combination gas control), refer to the

control manufacturer’s literature supplied with the unit.

22. Once proper operation of the unit has been verified,

remove any jumper wires that were required for testing.

23. Replace the side control access panel.

24. If installed at altitudes above 2,000', affix label included with

high altitude kit and fill in all fields with a permanent marker.

Main Burner Adjustment

The gas pressure regulator (integral to the combination gas

control) is adjusted at the factory for average gas conditions. It

is important that gas be supplied to the unit heater in accordance

with the input rating on the serial plate. Actual input should be

checked and necessary adjustments made after the unit heater

is installed. Over-firing, a result of too high an input, reduces

the life of the appliance and increases maintenance. Under no

circumstances should the input exceed that shown on the serial

plate.

Measuring the manifold pressure is done at the outlet pressure

tap of the gas valve.

To Adjust the Manifold Pressure

1. Move the field installed manual shut-off valve to the “OFF”

position.

2. Remove the 1/8" pipe plug from the outlet pressure tap on

the gas valve and attach a water manometer of “U” tube

type which is at least 12" high.

3. Move the field installed manual gas shut-off valve to the

“ON” position.

4. Create a high-fire call for heat from the thermostat.

5. Refer to Table 11.1 to determine the correct high fire

manifold pressure for the gas type of the unit. Pressures at

0-2,000' elevation are 3.5" W.C. for natural gas, 10" W.C.

for propane gas, for elevations above 2,000' refer to the

instructions in “Gas Connections - High Altitude Accessory

Kit” on page 12. Adjust the main gas pressure regulator

spring to achieve the proper manifold pressure (for location,

see the combination gas control literature supplied with

unit).

6. After adjustment, move the field installed manual shut-off

valve to the “OFF” position and replace the 1/8" pipe plug.

7. After the plug is in place, move the field installed manual

shut-off valve to the “ON” position and recheck pipe plugs

for gas leaks with soap solution.

IMPOR

ANT

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