Tappan PPG3GE, Single Phase Guide d'installation

Marque: Tappan

Modèle: PPG3GE, Single Phase

Taper: Guide d'installation

Ce manuel convient également à

R8GE, Single Phase

Premium Model Shown

14 SEER / 81% AFUE

Single Package Gas Heating / Electric Cooling

*R8GE / PPG3GE SERIES

INSTALLATION INSTRUCTIONS

WARNING AVERTISSEMENT

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly could

result in serious injury or property damage.

RISQUE D’INCENDIE OU D’EXPLOSION

Si les consignes de sécurité ne sont pas suivies à la

lettre, cela peut entraîner la mort, de graves blessures

ou des dommages matériels.

– Do not store or use gasoline or other ﬂammable

vapors and liquids in the vicinity of this or any

other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use

any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a

neighbors phone. Follow the gas suppliers

instructions.

• If you cannot reach your gas supplier, call the

ﬁre department.

– Installation and service must be performed by

a qualiﬁed installer, service agency or the gas

supplier.

– Ne pas entreposer ni utiliser de l’essence ni d’autres

vapeurs ou liquides inﬂammables dans le voisinage

de cet appareil, ni de tout autre appareil.

QUE FAIRE SI UNE ODEUR DE GAZ EST

DÉTECTÉE

• Ne mettre en marche aucun appareil.

• Ne toucher aucun interrupteur électrique; ne pas

utiliser de téléphone dans le bâtiment.

• Quitter le bâtiment immédiatement.

• Appeler immédiatement le fournisseur de gaz

en utilisant le téléphone d’un voisin. Suivre les

instructions du fournisseur de gaz.

• Si le fournisseur de gaz n’est pas accessible, appeler

le service d’incendie.

– L’installation et l’entretien doivent être effectués

par un installateur ou une entreprise d’entretien

qualiﬁé, ou le fournisseur de gaz.

DO NOT DESTROY THIS MANUAL. READ ALL INSTRUCTIONS IN THIS MANUAL AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

NE PAS DÉTRUIRE. LIRE TOUTES LES INSTRUCTIONS DONNÉE DANS LE MANUEL ET CONSERVER EN UN LIEU SÛR POUR RÉFÉRENCE ULTÉRIEURE.

TABLE OF CONTENTS

IMPORTANT SAFETY INFORMATION ........................... 3

REQUIREMENTS & CODES ........................................... 4

GENERAL INFORMATION .............................................. 5

Before you install this unit .............................................. 5

Locating the Equipment ................................................. 5

Heating Load ................................................................. 5

COMBUSTION AIR & VENTING REQUIREMENTS ....... 6

General Information ....................................................... 7

Vent Termination ........................................................... 7

CIRCULATING AIR SUPPLY .......................................... 8

Air Ducts .................................................................... 8

Air Filter Requirements .............................................. 8

Unconditioned Spaces ............................................... 8

Acoustical Duct Work ................................................. 8

UNIT INSTALLATION ...................................................... 9

Packaging Removal ....................................................... 9

Rigging & Hoisting ......................................................... 9

Clearances to Combustible Materials ............................ 9

Rooftop .......................................................................... 9

Ground Level ................................................................. 9

Horizontal to Downﬂow Conversion ............................... 9

Condensate Drain .......................................................... 9

ELECTRICAL WIRING .................................................... 10

Pre-Electrical Checklist .................................................. 10

Grounding ...................................................................... 11

Line Voltage ................................................................... 11

Thermostat / Low Voltage Connections ......................... 11

Checking Heat Anticipator Settings ........................... 11

Blower Speed ................................................................ 12

5-Speed ECM Motor .................................................. 12

Optional Furnace Control Board Connections ............... 12

Electronic Air Cleaner ................................................ 12

Humidiﬁer ................................................................... 12

GAS SUPPLY & PIPING .................................................. 13

Leak Check .................................................................... 13

High Altitude Conversion - Natural Gas ......................... 14

LP / Propane Gas Conversion ....................................... 14

START UP & ADJUSTMENTS ........................................ 15

Pre-Start Check List ...................................................... 15

Start-Up Procedure ........................................................ 15

Air Circulation ............................................................. 15

System Cooling .......................................................... 15

System Heating .......................................................... 16

Verifying & Adjusting Temperature Rise ........................ 16

Verifying & Adjusting Firing Rate ................................... 16

Manifold Pressure Adjustment ....................................... 16

Verifying Over-Temperature Limit Control Operation .... 17

Verifying Burner Operation ............................................ 17

OPERATING SEQUENCE ............................................... 17

Heating Mode ................................................................ 17

Cooling Mode ................................................................ 18

Fan Mode ...................................................................... 18

REPLACEMENT PARTS ................................................. 18

EQUIPMENT MAINTENANCE ......................................... 18

Cleaning of Heat Exchanger .......................................... 19

Cleaning of Burners ....................................................... 19

COMPONENT FUNCTIONS ............................................ 20

TROUBLESHOOTING ..................................................... 20

FIGURES & TABLES ....................................................... 21

Figure 9. Unit Dimensions .......................................... 21

Table 7. Center of Gravity & Unit Shipping Weights .. 21

Airﬂow Data ................................................................... 22

Table 8. Nominal Airﬂow Rates & Temperature

Rises (° F) .................................................... 22

Gas Information ............................................................. 24

Table 9. Gas Pipe Capaacities .................................. 24

Table 10. Gas Flow Rates ......................................... 24

Figure 10. Gas Valve Label ....................................... 25

Wiring Diagram & Electrical Data .................................. 26

Figure 11. Wiring Diagram for 208/230V / 60 Hz Unit

with ECM Motor ........................................ 26

Table 11. Electrical Data. ........................................... 27

REFRIGERANT CHARGING ........................................... 27

Application Notes & Charging Charts ............................ 27

Refrigerant Charging Tables (Cooling Mode Only) ....... 28

Table 12. Charging Table for 2 Ton Models .............. 28

Table 13. Charging Table for 2.5 Ton Models ........... 28

Table 14. Charging Table for 3 Ton Models .............. 29

Table 15. Charging Table for 3.5 Ton Models ........... 29

Table 16. Charging Table for 4 Ton Models .............. 30

Figure 12. Charging Chart for 5 Ton Models ............. 30

INSTALLATION CHECKLIST .......................................... 32

IMPORTANT SAFETY INFORMATION

Please read all instructions before servicing this equipment.

Pay attention to all safety warnings and any other special

notes highlighted in the manual. Safety markings are used

frequently throughout this manual to designate a degree or

level of seriousness and should not be ignored. WARNING

indicates a potentially hazardous situation that if not avoided,

could result in personal injury or death. CAUTION indicates a

potentially hazardous situation that if not avoided, may result

in minor or moderate injury or property damage.

WARNING:

ELECTRICAL SHOCK, FIRE OR

EXPLOSION HAZARD

Failure to follow safety warnings exactly could

result in serious injury or property damage.

Improper servicing could result in dangerous

operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical power

to furnace.

• When servicing controls, label all wires prior to

disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

AVERTISSEMENT:

RISQUE DE CHOC ÉLECTRIQUE,

D’INCENDIE OU D’EXPLOSION

Le non-respect des avertissements de sécurité

pourrait entraîner un fonctionnement dangereux

de l’appareil, des blessures graves, la mort ou des

dommages matériels.

Un entretein incorrect pourrait entraîner un

fonctionnement dangereux de l’appareil, des blessures

graves, la mort ou des dommages matériels

• Couper toute alimentation électrique au

générateur d’air chaud avant de prodéder aux

travaux d’entretein.

• Au moment de l’entretien des commandes,

étiquetez tous les ﬁls avant de les débrancher.

S’assurer de les raccorder correctement.

• S’assurer que l’appareil fonctionne adéquatement

aprés l’entretien.

WARNING:

These units are fully charged with R-410A refrigerant

and ready for installation. When a system is installed

according to these instructions, no refrigerant

charging is required. If repairs make it necessary for

evacuation and charging, it should only be attempted

by qualiﬁed, trained personnel thoroughly familiar

with this equipment. Some local codes require

licensed installation service personnel to service

this type of equipment. Under no circumstances

should the homeowner attempt to install and/or

service this equipment. Failure to comply with this

warning could result in equipment damage, personal

injury, or death.

WARNING:

Do not place combustible material on or against the

unit cabinet. Do not place combustible materials,

including gasoline and any other ﬂammable vapors

and liquids, in the vicinity of the unit.

WARNING:

PROPOSITION 65 WARNING: This product contains

ﬁberglass wool, a product known to the state of

California to cause cancer. Disturbing the insulation

of this product during installation, maintenance, or

repair will expose you to ﬁberglass wool.

• Breathing this material may cause respiratory

irritations or may cause lung cancer.

• Fiberglass wool may also cause eye irritation,

skin sensitization, or other allergic responses in

susceptible individuals.

• Always wear goggles, disposable gloves, long

sleeved shirt, and appropriate breathing protection

when working near this insulation. If contact with

skin occurs, wash immediately with soap and water.

In case of contact with eyes, ﬂush immediately with

water for at least 15 minutes. Contact a physician

if needed.

WARNING:

The information listed below and on the next page

must be followed during the installation, service,

and operation of this unit. Unqualiﬁed individuals

should not attempt to interpret these instructions

or install this equipment. Failure to follow safety

recommendations could result in possible damage

to the equipment, serious personal injury or death.

• Before beginning the installation, verify that the unit model

is correct for the job. The unit model number is printed on

the data label. Follow all precautions in the literature, on

tags, and on labels provided with the equipment. Read and

thoroughly understand the instructions provided with the

equipment prior to performing the installation and operational

checkout of the equipment.

• Never test for gas leaks with an open ﬂame. Use a

commercially available soap solution to check all connections.

See page 13.

• Installation of equipment may require brazing operations.

Installer must comply with safety codes and wear appropriate

safety equipment (safety glasses, work gloves, fire

extinguisher, etc.) when performing brazing operations.

• This equipment is NOT to be used for temporary heating of

buildings or structures under construction.

• Use caution when handling this appliance or removing

components. Personal injury can occur from sharp metal

edges present in all sheet metal constructed equipment.

• Follow all precautions in the literature, on tags, and on

labels provided with the equipment. Read and thoroughly

understand the instructions provided with the equipment

prior to performing the installation and operational checkout

of the equipment.

• The installer should become familiar with the units wiring

diagram before making any electrical connections to the

unit. See the unit wiring label or Figure 11 (page 26).

REQUIREMENTS & CODES

• This equipment must be installed in accordance with

instructions outlined in this manual, all applicable local

building codes, and the current revision of the National

Fuel Gas Code (NFPA54/ANSI Z223.1) or the Natural

Gas and Propane Installation Code, CAN/CGA B149.1.

• All electrical wiring must be completed in accordance with

local, state and national codes and regulations and with the

National Electric Code (ANSI/NFPA 70) or in Canada the

Canadian Electric Code Part 1 CSA C.22.1.

• The installer must comply with all local codes and regulations

which govern the installation of this type of equipment.

Local codes and regulations take precedence over any

recommendations contained in these instructions. Consult

local building codes and the National Electrical Code (ANSI

CI) for special installation requirements.

• This equipment contains liquid and gaseous refrigerant

under high pressure. Installation or servicing should only be

performed by qualiﬁed trained personnel thoroughly familiar

with this type equipment.

• Install this unit only in a location and position as speciﬁed on

Figure 1 (page 5). This unit is designed only for outdoor

installations and should be located with consideration

of minimizing the length of the supply and return ducts.

Consideration should also be given to the accessibility of

fuel, electric power, service access, noise, and shade.

• Air Ducts must be installed in accordance with the standards

of the National Fire Protection Association “Standards for

Installation of Air Conditioning and Ventilation Systems”

(NFPA 90A), “Standard for Installation of Residence Type

Warm Air Heating and Air Conditioning Systems” (NFPA

90B), these instructions, and all applicable local codes.

• Consult Table 8 (page 22), and the rating plate for the

proper circulating air ﬂow and temperature rise. It is important

that the duct system be designed to provide the correct ﬂow

rates and external pressure rise. An improperly designed

duct system can result in nuisance shutdowns, and comfort

or noise issues.

• Use only with the type of gas approved for this unit. Refer

to the unit rating plate.

• Provide adequate combustion and ventilation air to the unit.

See page 6 & page 7.

• Provide adequate clearances around the combustion air

intake louvers. See Figure 1.

• Combustion products must be discharged outdoors. Connect

this unit to an approved vent system only, as speciﬁed on

page 7.

• The information listed below is for reference purposes only

and does not necessarily have jurisdiction over local or state

codes. Always consult with local authorities before installing

any gas appliance.

Combustion & Ventilation Air

• US: National Fuel Gas Code (NFGC), Air for Combustion

and Ventilation

• CANADA: Natural Gas and Propane Installation Codes

(NSCNGPIC), Venting Systems and Air Supply for

Appliances

Duct Systems

• US and CANADA: Air Conditioning Contractors Association

(ACCA) Manual D, Sheet Metal and Air Conditioning

Contractors National Association (SMACNA), or American

Society of Heating, Refrigeration, and Air Conditioning

Engineers (ASHRAE) Fundamentals Handbook

Electrical Connections

• US: National Electrical Code (NEC) ANSI/NFPA 70

• CANADA: Canadian Electrical Code CSA C22.1

Gas Piping & Gas Pipe Pressure Testing

• US: NFGC and National Plumbing Codes

• CANADA: NSCNGPIC

General Installation

• US: Current edition of the NFGC and the NFPA 90B. For

copies, contact the National Fire Protection Association Inc.,

Batterymarch Park, Quincy, MA 02269; or American Gas

Association, 400 N. Capitol, N.W., Washington DC 20001

or www.NFPA.org

• CANADA: NSCNGPIC. For a copy, contact Standard Sales,

CSA International, 178 Rexdale Boulevard, Etobicoke

(Toronto), Ontario, M9W 1R3 Canada

Safety

• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the Installation

Standards, Warm Air Heating and Air Conditioning Systems

ANSI/NFPA 90B.

• CANADA: CAN/CGA-B149.1 and .2–M00 National Standard

of Canada. (NSCNGPIC)

GENERAL INFORMATION

This single package gas heating / electric cooling unit is

designed only for outdoor rooftop or ground level slab

installations and can be readily connected to the high static duct

system of a home. This unit has been tested for capacity and

efﬁciency in accordance with AHRI standards and will provide

many years of safe and dependable comfort, providing it is

properly installed and maintained. With regular maintenance,

this unit will operate satisfactorily year after year. Abuse,

improper use, and/or improper maintenance can shorten the

life of the appliance and create unsafe hazards.

To achieve optimum performance and minimize equipment

failure, it is recommended that periodic maintenance be

performed on this unit. The ability to properly perform

maintenance on this equipment requires certain tools and

mechanical skills.

Before you install this unit

√ The cooling load of the area to be conditioned must be

calculated and a system of the proper capacity selected. It is

recommended that the area to be conditioned be completely

insulated and vapor sealed.

√ Check the electrical supply and verify the power supply is

adequate for unit operation. Consideration should be given

to availability of electric power, service access, noise, and

shade. If there is any question concerning the power supply,

contact the local power company.

√ All units are securely packed at the time of shipment and

upon arrival should be carefully inspected for damage prior

to installing the equipment at the job site. Verify coil ﬁns are

straight. If necessary, comb ﬁns to remove ﬂattened or bent

ﬁns. Claims for damage (apparent or concealed) should be

ﬁled immediately with the carrier.

√ Survey the job site to determine the best location for setting

the unit. Choose an appropriate location that minimizes the

length of the supply and return air ducts.

√ Please consult your dealer for maintenance information

and availability of maintenance contracts. Please read all

instructions before installing the unit.

Locating the Equipment

• Clearance in accordance with local installation codes, the

requirements of the gas supplier and the manufacturer’s

installation instructions.

• Dégaugement conforme aux codes d’installation locaux,

aux exigences du fournisseur de gaz et aux instructions

d’installation du fabricant.

• A clearance of at least 36 inches from the blower access

panel and from the louvered control access panel is

recommended for servicing and maintenance. Where

accessibility to combustibles clearances are greater

than minimum clearances, accessibility clearances

must take preference.

• Select a solid, level position, preferably on a concrete slab,

slightly above the grade level, and parallel to the home. DO

NOT PLACE UNIT UNDER THE HOME.

• Overhead obstructions, poorly ventilated areas, and areas

subject to accumulation of debris should be avoided. Do not

place the unit in a conﬁned space or recessed area where

discharge air from the unit to re-circulate into the condenser

air inlet, through the coil.

• Sufﬁcient clearance for unobstructed airﬂow through the

louvered control access panel and outdoor coil must be

maintained in order to achieve rated performance. See

Figure 1 for minimum clearances to obstructions.

• The hot condenser air must be discharged up and away from

the home, and if possible, in a direction with the prevailing

wind.

• If practical, place the air conditioner and its ducts in an area

where they will be shaded from the afternoon sun, when

the heat load is greatest.

Heating Load

This unit should be sized to provide the design heating

load requirement. Heating load estimates can be made

using approved methods available from Air Conditioning

Contractors of America (Manual J); American Society of

Heating, Refrigerating, and Air Conditioning Engineers; or other

approved engineering methods. For installations above 2,000

ft., the unit should have a sea level input rating large enough

that it will meet the heating load after deration for altitude.

Minimum Required

Clearances to Combustibles

36"

TOP OF UNIT

TO BE

UNOBSTRUCTED

See Note 1

See Note 2

NOTE 1: 6” When coil is present on duct side.

NOTE 2: 1” When no coil is present on duct side.

Figure 1. Clearance Requirements

COMBUSTION AIR & VENTING REQUIREMENTS

WARNING: AVERTISSEMENT:

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for

each appliance connected to the venting system

being placed into operation could result in carbon

monoxide poisoning or death.

The following steps shall be followed with each

individual appliance connected to the venting

system being placed in operation, while all other

appliances connected to the venting system are

not in operation:

1. Seal any unused openings in the venting

system.

2. Inspect the venting system for proper size and

horizontal pitch, as required in the National Fuel

Gas Code, ANSI Z223.1/NFPA 54 or the CSA

B149.1, Natural Gas and Propane Installation

Codes and these instructions. Determine that

there is no blockage or restriction, leakage,

corrosion and other deﬁciencies which could

cause an unsafe condition.

3. As far as practical, close all building doors and

windows and all doors between the space in

which the appliance(s) connected to the venting

system are located and other spaces of the

building.

4. Close ﬁreplace dampers.

5. Turn on clothes dryers and any appliance not

connected to the venting system. Turn on

any exhaust fans, such as range hoods and

bathroom exhausts, so they are operating at

maximum speed. Do not operate a summer

exhaust fan.

6. Follow the lighting instructions. Place the

appliance being inspected into operation.

Adjust the thermostat so appliance is operating

continuously.

7. Test for spillage from draft hood equipped

appliances at the draft hood relief opening

after 5 minutes of main burner operation. Use

the ﬂame of a match or candle.

8. If improper venting is observed during any of

the above tests, the venting system must be

corrected in accordance with the National Fuel

Gas Code, ANSI Z223.1/NFPA 54 and/or CSA

B149.1, Natural Gas and Propane Installation

Codes.

9. 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-ﬁred burning appliance to their

previous conditions of use.

RISQUE D’INTOXICATION AU MONOXYDE DE

CARBONE

Si les étapes décrites ci-dessous ne sont pas suivies

pour chacun des appareils raccordés au système de

ventilation au moment de sa mise en marche, cela peut

entraîner une intoxication au monoxyde de carbone

ou la mort. Les étapes suivantes doivent être suivies

pour chacun des appareils raccordés au système de

ventilation au moment de sa mise en marche, alors

que tous les autres appareils raccordés au système

de ventilation ne sont pas en marche :

1. Sceller toutes les ouvertures inutilisées du système

de ventilation.

2. Inspecter le système de ventilation aﬁn de vériﬁer

si la taille et l’inclinaison par rapport à l’horizontale

sont conformes aux exigences du National Fuel Gas

Code, ANSI Z223.1/NFPA 54 ou du Code d’installation

du gaz naturel et du propane, CSA B149.1 et à ces

instructions. Vériﬁer qu’il n’y a pas d’obstruction

ou de restriction, de fuite, de corrosion et d’autres

problèmes qui pourraient entraîner une situation

dangereuse.

3. Si possible, fermer toutes les portes et fenêtres

du bâtiment ainsi que toutes les portes séparant

l’endroit où se trouvent les appareils raccordés

au système de ventilation et les autres zones du

bâtiment.

4. Fermer le registre des foyers.

5. Mettre les sécheuses en marche ainsi que tous

les autres appareils qui ne sont pas raccordés au

système de ventilation. Mettre en marche tous les

ventilateurs de tirage, comme celui des hottes de

cuisine et des salles de bains, et les régler à la

puissance maximale. Ne pas mettre en marche les

ventilateurs d’été.

6. Suivre les instructions d’allumage. Mettre en marche

l’appareil soumis à l’inspection. Régler le thermostat

de manière à ce que l’appareil fonctionne en continu.

7. Vériﬁer la présence de fuite au niveau de l’ouverture

du coupe-tirage des appareils qui en sont dotés après

5 minutes de fonctionnement du brûleur principal.

Utiliser la ﬂamme d’une allumette ou d’une bougie.

8. Si un problème de ventilation est observé pendant

l’un des essais décrits ci-dessus, des correctifs

doivent être apportés au système de ventilation

conformément au National Fuel Gas Code, ANSI

Z223.1/NFPA 54 et (ou) au Code d’installation du

gaz naturel et du propane, CSA B149.1.

9. Une fois qu’il a été déterminé que chaque appareil

raccordé au système de ventilation fonctionne

correctement au moyen des essais décrits ci-dessus,

les portes, les fenêtres, les ventilateurs, les registres

de foyer et tous les autres appareils de combustion

alimentés au gaz doivent être remis dans leur état

initial.

General Information

WARNING:

Installation methods other than those described in

the following sections must comply with the National

Fuel Gas Code and all applicable local codes for

providing sufﬁcient combustion air to the unit.

• Provisions must be made during the installation of this unit

that provide an adequate supply of air for combustion.

• Instructions for determining the adequacy of an installation

can be found in the current revision of the NFGC (ANSI Z223.1

/ NFPA54). Consult local codes for special requirements.

These requirements are for US installations as found in the

NFGC.

• The requirements in Canada (B149.1) are structured

differently. Consult with B149.1 and local code ofﬁcials for

Canadian installations.

WARNING:

Combustible air must not be drawn from a

contaminated atmosphere. Excessive exposure to

contaminated combustion air will result in safety

and performance related problems.

• To maximize heat exchanger life, the combustion air

must be free of chemicals that can form corrosive acidic

compounds in the combustion gases. The recommended

source of combustion air is to use clean air from outside.

DO NOT place any chemicals with ﬂammable or caustic

vapors or these other corrosive chemicals near the vent

termination:

• Gasoline/Kerosene

• Permanent wave solutions

• Chlorinated waxes and cleaners

• Chlorine based swimming pool chemicals

• Water softening chemicals

• De-icing salts or chemicals

• Carbon tetrachloride

• Halogen type refrigerants

• Cleaning solvents

• Cements, glues, paint removers, varnishes, etc.

• Hydrochloric acid

• Masonry acid washing materials

• Plumbing Stack

Vent Termination

This unit has been equipped with an integral venting system

and designed to operate only with this venting system. No

additional venting shall be used. This unit must be vented to

the outdoors.

WARNING:

This unit is intended for outdoor installation only.

Do not vent the unit through a conventional venting

system.

A vent cover assembly has been supplied with the unit. and

can be found secured to the gas controls within the control

area of this unit. The vent cover assembly must be installed

to assure proper operation of the unit.

Figure 2. Vent Assembly

Figure 2 shows the proper installation of the vent cover

assembly over the vent outlet on the exterior of the corner

panel. The fasteners used to secure the vent cover assembly

have been included in the owner’s package. The following

list summarizes the requirements for the location of the vent

system termination:

• The location of the vent termination must be consistent

with the National Fuel Gas Code (ANSI Z223.1) or CAN/

CGA-B149 Installation Codes.

• The vent termination must be located at least 4 feet

horizontally from any electric meters, gas meters, regulators,

and relief equipment.

• The vent termination must be located at least 3 feet above

any forced air inlet located within 10 feet.

• The vent termination must be located at least 4 feet below,

4 feet horizontally from, or 1 foot above any door, window,

or gravity air inlet into any building.

• The vent termination must be located at least 1 foot above

grade.

• The unit should be installed in a way that prevents any

obstruction of the vent termination during accumulating

snow.

• The unit installation shall avoid areas where condensate

drainage may cause problems by dropping on planters or

patios, etc. Also verify exhaust gases will not impinge on

windows or building surfaces, which may be compromised

or damaged by condensation.

• Do not install the unit such that exhaust from the vent

termination is directed into window wells, stairwells, under

decks, or in alcoves or similarly recessed areas. The vent

termination must not be located above any public walkways.

CIRCULATING AIR SUPPLY

WARNING:

Products of combustion must not be allowed to

enter the return air ductwork or the circulating air

supply. Failure to prevent products of combustion

from being circulated into the living space can create

potentially hazardous conditions including carbon

monoxide poisoning that could result in personal

injury or death.

All return ductwork must be adequately sealed, all

joints must be taped, and the ductwork must be

secured to the unit with sheet metal screws. When

return air is provided through the bottom of the unit,

the joint between the unit and the return air plenum

must be air tight.

The roof curb or cement pad on which the unit is

mounted must provide sound physical support of

the unit with no gaps, cracks, or sagging between

the unit and the curb or pad.

Return air and circulating air ductwork must not

be connected to any other heat producing device

such as a ﬁreplace insert, stove, etc. Doing so may

result in ﬁre, explosion, carbon monoxide poisoning,

personal injury, or property damage.

Air Ducts

This unit is designed only for use with a supply and return

duct. Air ducts should be installed in accordance with

the standards of the National Fire Protection Association

“Standard for Installation of Air Conditioning Systems” (NFPA

90A), “Standard for Installation of Residence Type Warm Air

Heating and Air Conditioning Systems” (NFPA 90B), and all

applicable local codes. NFPA publications are available by

writing to: National Fire Protection Association, Batterymarch

Park, Quincy, ME 02269 or visit www.NFPA.org on the web.

• Design the duct work according to Manual D by the Air

Conditioning Contractors of America (ACCA).

• The ducts must be properly sized not to exceed 0.30 inches

WC pressure drop per 100 feet of equivalent duct at 400

SCFM per nominal ton of cooling capacity.

• Duct work should be attached directly to the unit ﬂanges for

horizontal applications.

• If roof curb is installed, the ducts must be attached to the

curb duct supports, not the unit.

• It is recommended that the outlet duct be provided with a

removable access panel. The opening should be accessible

when the unit is installed in service and shall be sizes so that

smoke or reﬂected light may be observed inside the casing

to indicate the presence of leaks in the heat exchanger. The

cover for the opening shall be attached in a way that will

prevent leaks.

• If outside air is utilized as return air to the unit for ventilation

or to improve indoor air quality, the system must be designed

so that the return air to the unit is not less than 50° F (10°

C) during heating operation.

Air Filter Requirements

WARNING:

Never operate the unit without a ﬁlter in place.

Dust and lint could accumulate on internal parts,

resulting in loss of efﬁciency, equipment damage

and possible ﬁre.

NOTE TO INSTALLER: After installing or replacing the ﬁltration

system for this unit, add the following statement on or adjacent

to the ﬁlter service panel: “Replace ﬁlter(s) installed in your

system only with the same dimensional size ﬁlters that

are being replaced.”

• A suitable air ﬁlter must be installed upstream of the

evaporator coil of the return air system. Refer to Table 1

for recommended external ﬁlter sizes.

• All return air must pass through the ﬁlters before entering

the evaporator coil. It is important that all ﬁlters be kept

clean and replaced frequently to ensure proper operation

of unit. Dirty or clogged ﬁlters will reduce the efﬁciency of

the unit and result in unit shutdowns.

• Air ﬁlter pressure drop must not exceed 0.08 inches WC.

Unconditioned Spaces

All duct work passing through unconditioned space must

be properly insulated to minimize duct losses and prevent

condensation. Use insulation with an outer vapor barrier. Refer

to local codes for insulation material requirements.

Acoustical Duct Work

Certain installations may require the use of acoustical lining

inside the supply duct work.

• Acoustical insulation must be in accordance with the current

revision of the Sheet Metal and Air Conditioning Contractors

National Association (SMACNA) application standard for

duct liners.

• Duct lining must be UL classiﬁed batts or blankets with a

ﬁre hazard classiﬁcation of FHC-25/50 or less.

• Fiber duct work may be used in place of internal duct liners if

the ﬁber duct work is in accordance with the current revision

of the SMACNA construction standard on ﬁbrous glass

ducts. Fibrous duct work and internal acoustical lining must

be NFPA Class 1 air ducts when tested per UL Standard

181 for Class 1 ducts.

Table 1. Recommended External Air Filter Sizes

NOMINAL

COOLING

(TONNAGE)

APPROXIMATE

AIR FLOW

RANGE (CFM)

APPROXIMATE

FILTER AREA

(SQ. IN.)*

RECOMMENDED

FILTER SIZE

(IN. X IN.)

2.0 600-900 450 20 x 25

2.5 750-1200 550 20 x 30

3.0 1100-1300 625 25 x 25

3.5 1200-1600 750 24 x 30

4.0 1400-1800 850 18 x 24 (2 required)

5.0 1700-2200 1000 20 x 25 (2 required)

* Based on velocity of 300 ft/min for disposable ﬁlters.

UNIT INSTALLATION

Packaging Removal

Remove the shipping carton and User’s Manual from the

equipment. For rooftop installations, remove and discard the

two supports attached beneath the unit.

Rigging & Hoisting

WARNING:

To avoid the risk of property damage, personal injury,

or death, it is the rigger’s responsibility to ensure

that whatever means are used to hoist the unit are

safe and adequate:

• The lifting equipment must be adequate for the

load. Refer to

Table 7 (page 21) for unit weights.

• The unit must be lifted from the holes in the base

rails using cables or chains.

• Spreader bars are required to protect the unit and

ensure even loading.

• Keep the unit in an upright position at all times. The

rigging must be located outside the units center

of gravity. Refer to

Figure 9 (page 21) for locating

the center of gravity.

• All panels must be securely in place during rigging

and hoisting.

Clearances to Combustible Materials

These units are certiﬁed as combination heating and cooling

equipment for outdoor rooftop or ground level installations.

Units may be installed on combustible ﬂooring or Class A,

B, or C rooﬁng material when used with bottom supply and

return air ducts as long as the following requirements are met:

• If using bottom discharge with return air ducts a roof curb

must be installed prior to unit installation. See Rigging and

Hoisting section for setting of the unit.

• Sufﬁcient clearance for unobstructed airﬂow through the

outdoor coil must also be maintained in order to achieve

rated performance. See page 5 for information about

locating the equipment.

Rooftop

Rooftop installations must be located according to local building

codes or ordinances and these requirements:

• The roof must be capable of handling the weight of the unit.

For unit weights, see Table 7. Reinforce the roof if necessary.

• The appropriate accessory roof curb must be installed prior

to unit installation. The roof curb must be square and level

to ensure proper condensate drainage. Please follow all

instructions provided with the kit. See Figure 3 (page

10).

• Secure roof curb or frame to roof using acceptable

mechanical methods per local codes. NOTE: Make sure the

two supports beneath the unit have been removed.

Ground Level

Ground level installations must be located according to local

building codes or ordinances and these requirements:

• Clearances must be in accordance with those shown in

Figure 1 (page 5).

• A suitable mounting pad must be provided and be separate

from the building foundation. The pad must be level to ensure

proper condensate disposal and strong enough to support

the unit’s weight. The slab height must be a minimum of 2”

(5cm) above grade and with adequate drainage. See Figure

4 (page 10).

• Remove and discard the horizontal Supply and Return duct

covers located on the rear of the unit. Form duct attachment

ﬂanges by bending the sheet metal outward 90 degrees

along the perforated lines.

• Firmly attach ductwork directly to these ﬂanges with

screws or other approved mechanical connections and

not to the Supply/Return air panels to avoid damage to

internal components of the equipment. Once completed

use approved duct sealing methods to ensure an air and

watertight seal is achieved.

Horizontal to Downﬂow Conversion

The unit is shipped ready for horizontal duct connections.

If down ﬂow ducts are required, the unit must be converted

following the steps below for both the supply and return ducts.

1. Remove the horizontal duct cap.

2. Locate the duct cap inside the duct openings and remove

the screw holding it in place.

3. Lift the cap out of the unit. (Hint: The cap can be pushed

up from the bottom by reaching through the fork slot).

4. Cover the horizontal duct opening with the horizontal duct

cap. The insulation will be on the indoor side.

5. Fasten the cover with screws to seal.

6. Remove and discard the two wood supports beneath the

unit.

Condensate Drain

Condensate is removed from the unit through the 3/4” female

pipe ﬁtting located on the front side of the unit. See Figure 5

(page 10).

Install a 2 inch condensate trap in the drain line of the same

size and prime with water. When connecting rigid drain line,

hold the female ﬁtting with a wrench to prevent twisting. Do

not over tighten! Refer to local codes and restrictions for

proper condensate disposal requirements.

ELECTRICAL WIRING

WARNING:

ELECTRICAL SHOCK, FIRE OR

EXPLOSION HAZARD

Failure to follow safety warnings exactly could

result in serious injury or property damage.

Improper servicing could result in dangerous

operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical power

to furnace.

• When servicing controls, label all wires prior to

disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

AVERTISSEMENT:

RISQUE DE CHOC ÉLECTRIQUE,

D’INCENDIE OU D’EXPLOSION

Le non-respect des avertissements de sécurité

pourrait entraîner un fonctionnement dangereux

de l’appareil, des blessures graves, la mort ou des

dommages matériels.

Un entretein incorrect pourrait entraîner un

fonctionnement dangereux de l’appareil, des

blessures graves, la mort ou des dommages

matériels

• Couper toute alimentation électrique au

générateur d’air chaud avant de prodéder aux

travaux d’entretein.

• Au moment de l’entretien des commandes,

étiquetez tous les ﬁls avant de les débrancher.

S’assurer de les raccorder correctement.

• S’assurer que l’appareil fonctionne adéquatement

aprés l’entretien.

• Electrical connections must be in compliance with

all applicable local codes and ordinances, and with

the current revision of the National Electric Code

(ANSI/NFPA 70).

• For Canadian installations the electrical connections and

grounding shall comply with the current Canadian Electrical

Code (CSA C22.1 and/or local codes).

IMPORTANT NOTE:

If replacing any of the original wires supplied with the

furnace, the replacement wire must be copper wiring

having the same guage, voltage, and temperature rating.

Pre-Electrical Checklist

√ Verify the voltage, frequency, and phase of the supply

source match the speciﬁcations on the unit rating plate.

√ Verify that the service provided by the utility is sufﬁcient to

handle the additional load imposed by this equipment. See

Figure 3. Roof Top Installation

ACCESSORY

ROOF CURB

Figure 4. Ground Level Installation

2”

Condensate Drain

High

Side

Low

Side

Figure 5. Refrigerant Service Ports &

Condensate Drain Locations

Table 2 (page 11) and Table 11 (page 27) (or the unit

rating label) for proper high voltage wiring requirements.

√ Verify factory wiring is in accordance with the unit wiring

diagram. See Figure 11 (page 26). Make sure the

connections didn’t loosen during shipping or installation.

Grounding

WARNING:

The unit cabinet must have an uninterrupted or

unbroken electrical ground to minimize personal

injury if an electrical fault should occur. Do not use

gas piping as an electrical ground!

This unit must be electrically grounded in accordance with

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

Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical

Code. Grounding of the unit is accomplished by using the

grounding lug provided in the control box.

Line Voltage

• The line voltage to the unit should be supplied from a

dedicated branch circuit containing the correct fuse or circuit

breaker for the unit.

• An electrical disconnect must be located within sight

of and readily accessible to the unit. This switch shall be

capable of electrically de-energizing the outdoor unit. See

unit data label for proper incoming ﬁeld wiring. Any other

wiring methods must be acceptable to authority having

jurisdiction.

• Use only copper wire for the line voltage power supply to

this unit as shown in Table 2. Use proper code agency listed

conduit and a conduit connector for connecting the supply

wires to the unit. Use of rain tight conduit is recommended.

• Provide power supply for the unit in accordance with the

unit wiring diagram and the unit rating plate.

• Overcurrent protection must be provided at the branch circuit

distribution panel and sized as shown on the unit rating

label and according to applicable local codes. See Table

11 (or the unit rating plate) for minimum circuit ampacity

and maximum overcurrent protection limits.

• A wiring diagram is located on the inside cover of the control

access panel of the outdoor unit. The installer should become

familiar with the wiring diagram before making any electrical

connections to the outdoor unit. See Figure 11.

• Units are shipped from the factory wired for 240 volt

transformer operation. For 208V operation, remove the lead

from the transformer terminal marked 240V and connect it

to the terminal marked 208V.

• Connect the line-voltage leads to the terminals on the

contactor inside the control compartment.

Thermostat / Low Voltage Connections

• This unit is designed to operate from a 24 VAC Class II

control circuit. A single stage cooling / single stage heating

thermostat should be used with this unit. A 2-stage cooling /

2-stage heating thermostat is recommended for economizer

operation. See Figure 6 (page 12) for typical thermostat

connection.

• The control circuit wiring must comply with the current

provisions of the NEC (ANSI/NFPA 70) and with applicable

local codes having jurisdiction. Thermostat connections

should be made in accordance with the instructions supplied

with the thermostat and the indoor equipment.

• The low voltage wires must be properly connected. Route 24V

control wires through the sealing grommet near the power

entrance. Recommended wire gauge and wire lengths for

typical thermostat connections are listed in Table 3 (page

12).

• Several thermostat options are available depending on the

accessories installed with the unit. Select a thermostat that

operates in conjunction with the installed accessories.

• The thermostat should be mounted about 5 feet above the

ﬂoor on an inside wall. DO NOT install the thermostat on

an outside wall or any other location where its operation

may be adversely affected by radiant heat from ﬁreplaces,

sunlight, or lighting ﬁxtures, and convective heat from warm

air registers or electrical appliances. Refer to the thermostat

manufacturer’s instruction sheet for detailed mounting

information.

Checking Heat Anticipator Settings

• Add the current draw of the system heating components.

• Measure the current ﬂow on the thermostat R-W circuit

after the circulating blower motor has started. Set the heat

anticipator according to the thermostat manufacturer’s

instructions for heat anticipator settings.

COPPER WIRE SIZE — AWG

(1% VOLTAGE DROP)

SUPPLY WIRE LENGTH-FEET

SUPPLY CIRCUIT

AMPACITY

200 150 100 50

6 8 10 14 15

4 6 8 12 20

4 6 8 10 25

4 4 6 10 30

3 4 6 8 35

3 4 6 8 40

2 3 4 6 45

2 3 4 6 50

2 3 4 6 55

1 2 3 4 60

NOTE: Wire Size based on N.E.C. for 60° type copper conductors.

Table 2. Copper Wire Size

Table 3. Thermostat Wire Gauge

THERMOSTAT

WIRE GAUGE

RECOMMENDED T-STAT WIRE

LENGTH (UNIT TO T-STAT)

2-WIRE

(HEATING)

5-WIRE

(HEATING / COOLING)

24 55 25

22 90 45

20 140 70

18 225 110

Figure 6. Typical Thermostat Connection

(Field Supplied) for 1-Stage Cool / 1-Stage Heat

TERMINAL BLOCK

FURNACE

BOARD

Optional, Refer to

Thermostat Instructions

INDOOR THERMOSTAT

SUB-BASE (TYPICAL)

Blower Speed

The blower speed is preset at the factory for proper fan only,

heating, and cooling operation. These factory settings are listed

in Table 8 (page 22). For optimum system performance and

comfort, it may be necessary to change the factory set speed.

CAUTION:

To avoid personal injury or property damage, make

sure the motor leads do not come into contact with

any uninsulated metal components of the unit.

5-Speed ECM Motor

1. Shut off all electrical power to the unit and remove the blower

panel. Locate the orange, red and blue wires terminated to

the blower motor. NOTE: The orange wire controls cooling

operation while the red wire controls heating operation. The

blue wire controls fan-only operation.

2. Verify the required speed from the airﬂow data found in

Table 8. Place appropriate wire on the correct motor speed

tap for the required airﬂow point.

3. The integrated furnace control can be set to a 2 or 3 speed

mode.

NOTE 1: When a G only call is received from the thermostat

(indicating a continuous fan mode), the blower will run the

HEAT speed when the 2-SPD mode is selected using the

jumper on the control board (factory setting).

NOTE 2: When 3-SPD mode is selected, the FAN speed is

energized and may be different than the heating or cooling

speed. If no jumper is present, the control defaults to the

2-SPD HEAT speed mode of operation. A call for heating

or cooling takes priority over fan only mode.

Optional Furnace Control Board Connections

Electronic Air Cleaner

The furnace control board provides output terminals for an

optional electronic air cleaner (EAC) that can be installed in the

return air duct of your system. THE EAC output is energized

any time the HEAT or COOL blower speed is energized.

Control ratings are 1.0 Amp. @ 240 VAC. Output connections

are made via board terminals labeled EAC and NEUTRAL.

Humidiﬁer

The furnace control board provides output terminals for

an optional humidiﬁer (HUM) that can be installed on your

system. The HUM output is energized any time the furnace

inducer motor is energized. Control ratings are 1.0 Amp. @

240 VAC. Output connections are made via board terminals

labeled HUM and NEUTRAL.

Check all factory wiring to the units wiring diagram. Inspect the

factory wiring connections to be sure none loosened during

shipping or installation.

GAS SUPPLY & PIPING

WARNING:

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly could

result in serious injury or property damage.

• Installation and service must be performed by

a qualiﬁed installer, service agency or the gas

supplier.

• Do not store or use gasoline or other ﬂammable

vapors and liquids in the vicinity of this or any

other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use

any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

• If you cannot reach your gas supplier, call the ﬁre

department.

AVERTISSEMENT:

RISQUE D’INCENDIE OU D’ EXPLOSION

• Le non-respect des avertissements de sécurité

pourrait entraîner des blessures graves, la mort

ou des dommages matériels.

• L’installation et l’entretien doivent être effectués

par un installateur qualiﬁé, un organisme de

service ou le fournisseur de gazstaller, service

agency or the gas supplier.

• Ne pas entreposer ni utiliser de l’essence ni

d’autres vapeurs ou liquides inﬂammables dans le

voisinage de cet appareil, ni de tout autre appareil.

QUE FAIRE S’IL Y A UNE ODEUR DE GAZ

• Ne pas tenter d’allumer aucun appareil.

• Ne toucher à aucun interrupteur électrique;

n’utiliser aucun téléphone dans le bâtiment.

• Évacuer l’immeuble immédiatement.

• Appeler immédiatement le fournisseur de gaz en

employant le téléphone d’un voisin. Respecter à

la lettre les instructions du fournisseur de gaz.

• Si personne ne répond, appeler le service des

incendies.

• All gas piping must be installed in compliance with

local codes and utility regulations. In the absence of

local codes the gas line installation must comply with

the latest edition of the National Fuel Gas Code ANSI

Z223.1 or CAN/CGA B149 Installation Codes.

• Some local codes require the installation of a manual

main shut-off valve and ground joint union external to the

unit. The shut-off valve should be readily accessible for

service and/or emergency use. Consult the local utility

or gas supplier for additional requirements regarding

placement of the manual main gas shut-off. See Figure

7 (page 14).

• The manifold pressure must be set to the appropriate

value for your installation. Refer to the Manifold

Pressure Adjustment section (page 16) for adjustment

instructions.

• Gas piping must never run in or through air ducts,

chimneys, gas vents, or elevator shafts.

• Compounds used to seal joints on gas piping must be

resistant to the actions of LP propane gas.

• The main gas shutoff valve and main power disconnect

to the unit must be properly labeled by the installer in

case emergency shutdown is required.

• An 1/8 inch NPT plugged tap must be installed in

the gas line immediately upstream of the gas supply

connection to the unit for use when measuring the gas

supply pressure. The plug should be readily accessible

for service use.

• A drip leg should be installed in the vertical pipe run

to the unit. See Figure 7.

This unit only has right side gas entry. When connecting the

gas, provide clearance between the gas supply line and the

entry hole in the unit’s casing to avoid unwanted noise and/

or damage to the unit. A typical gas service hookup is shown

in Figure 7.

Table 9 (page 24) lists gas pipe capacities for standard pipe

sizes as a function of length in typical applications based on

nominal pressure drop in the line.

Leak Check

WARNING:

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly could

result in serious injury or property damage.

Never test for gas leaks with an open ﬂame. Use

a commercially available soap solution made

speciﬁcally for the detection of leaks to check all

connections. A ﬁre or explosion may result causing

property damage, personal injury or loss of life.

AVERTISSEMENT:

RISQUE D’INDENDIE OU D’EXPLOSION

Si les consignes de sécurité ne sont pas suivies à la

lettre, cela peut entraîner la mort, de graves blessures

ou des dommages matériels.

Ne jamais vériﬁer la présence de fuites de gaz au

moyen d’une ﬂamme nue. Vériﬁer tous les raccords

en utilisant une solution savonneuse commerciale

conçue spécialement pour la détection de fuites. Un

incendie ou une explosion risque de se produire,

ce qui peut entraîner la mort, des blessures ou des

dommages matériels.

After the gas piping to the unit is complete, all connections

must be tested for gas leaks. This includes pipe connections

at the main gas valve, emergency shutoff valve and other

gas connectors. A soap and water solution can be applied on

each joint or union using a small paintbrush. If any bubbling

is observed, the connection is not sealed adequately and

must be retightened. Repeat the tightening and soap check

process until bubbling ceases.

• If pressure testing the gas supply lines at pressures

greater than 1/2 psig (14 inches WC), the unit must be

disconnected from the gas supply piping system to

prevent damage to the gas valve.

• If the test pressure is less than or equal to 1/2 psig

(14 inches WC), the unit must be isolated from the gas

supply line by closing the manual shut-off valve.

High Altitude Conversion - Natural Gas

Conversion of this unit must be performed by qualiﬁed service

personnel, using only approved parts. All installations must be

made in accordance with the National Fuel Gas Code and/or

local jurisdiction codes.

WARNING:

The reduction of input rating necessary for high

altitude installation may only be accomplished with

factory supplied oriﬁces. Do not attempt to drill out

oriﬁces in the ﬁeld. Improperly drilled oriﬁces may

cause ﬁre, explosion, carbon monoxide poisoning,

personal injury or death.

High altitude conversion can be ﬁeld performed by a simple

adjustment of manifold pressure or a change of the oriﬁces (if

necessary) as described on page 16. The changes required

depend on the installation altitude and the heating value of

the gas (based on sea level) which can be obtained from your

local gas utility. The heating value of gas at high altitude is

always lower than the sea level heating value. Natural Gas

heating values listed in Table 4 (page 15) are based on

sea level values.

For altitudes between 5,000 and 10,000 feet above sea level,

the unit can be converted by changing the oriﬁce and adjusting

the furnace manifold pressure. See Table 4 for the correct

oriﬁce and manifold pressure settings. NOTE: Each unit has

speciﬁc oroﬁces.

NOTE: If installing this unit above 2,000 feet, the input rate

must be reduced 4% per 1,000 feet of altitude (Example: 12%

at 3,000 feet, 16% at 4,000 feet, etc). Deration is necessary

to compensate for low atmospheric pressure at high altitudes.

LP / Propane Gas Conversion

WARNING:

This unit was equipped at the factory for use with

natural gas only. A special kit, supplied by the

manufacturer, is required to convert the unit to

operate on LP/propane gas. Failure to use the proper

conversion kit can cause ﬁre, explosion, property

damage, carbon monoxide poisoning, personal

injury, or death.

IMPORTANT NOTE: When converting a low NOx unit

from natural gas to propane (LP) gas, it is necessary to

remove the NOx bafﬂes.

Conversion of this equipment to LP/Propane gas must be

made by qualiﬁed service personnel, using approved factory

parts. Conversion to LP can be accomplished by replacing

the natural gas oriﬁces with the appropriate LP/Propane

oriﬁces and then adjusting the manifold pressure (page

16). Conversion to LP/Propane (sea level and high altitude)

is detailed in the installation instructions provided with the

conversion kit. Please follow the instructions provided in

each kit. Approved conversion kits are listed below:

Ground

Joint

Union

Dripleg

Shut-Off Valve

with

/8 NPT

plugged tap

Burner

Assembly

Manifold

Some utilities

require Shut-Off

Valve to be

4 to 5 feet

above floor

Automatic Gas Valve

(with manual shut-off)

Figure 7. Typical Gas Hookup - Right Side Entry

• The United States LP/Propane Gas Sea Level and High

Altitude Conversion Kit (P/N 904404A) is for LP/propane

conversion in the United States at altitudes between zero

and 10,000 ft. above sea level.

• The Canadian LP/Propane Gas Sea Level and High Altitude

Conversion Kit (P/N 904405A)is for LP/propane conversions

in Canada at altitudes between zero and 4,500 ft. above

sea level.

For installations between zero and 3,999 ft. above sea level,

a #54 drill size oriﬁce should be used. Installations 4,080 ft.

above sea level require a # 55 drill size oriﬁce. Table 5 (page

15) lists the correct oriﬁce size to use at different altitudes.

After changing the oriﬁces, it is required that you measure the

gas input rate by clocking the gas meter and using the local

gas heating value. See Verifying & Adjusting the Firing Rate

section on page 16.

START UP & ADJUSTMENTS

Pre-Start Check List

√ Verify the unit is level and allows condensate to drain.

√ Verify all clearance requirements are met and there is free

airﬂow to and from the outdoor coil.

√ Verify that the duct work is sealed to prevent air leakage

and air ﬁlter is installed.

√ Verify that the line voltage power leads are securely

connected and the unit is properly grounded.

√ Verify that the low voltage wires are securely connected to

the correct terminals in the low voltage area of the control

box.

√ Verify that the gas line service pressure does not exceed

10.0 inches WC (0.36 psig), and is not less than 4.5 inches

WC (0.16 psig) for natural gas. For LP gas the line service

pressure must not exceed 14 inches WC (0.51 psig) and

must not be less than 11.0 inches WC (0.40 psig).

√ Verify that the ﬂame roll-out control is closed. If necessary,

press the red button to reset the control. DO NOT install a

jumper wire across the control to defeat its function. If the

control reopens upon start-up, DO NOT reset the control

without identifying and correcting the fault condition which

caused the control to trip.

√ Verify that the gas line has been purged and all connections

are leak tight.

√ Verify that all exterior panels are replaced and securely

fastened.

√ Verify that the outdoor fan turns freely.

√ Verify that the power supply branch circuit overcurrent

protection is sized properly.

√ Verify that the thermostat is wired correctly. The thermostat

function switch should be set to OFF and the thermostat

fan switch should be set to AUTO.

Start-Up Procedure

WARNING:

If this unit is equipped with crankcase heaters, allow

24 hrs for heating of the refrigerant compressor

crankcase prior to start up or anytime the power

has been removed for more than 12 hrs. Failure to

comply may result in damage or cause premature

failure of the system.

Air Circulation

Leave the thermostat system mode on OFF, and set the fan

mode to ON. Blower should run continuously. Check the air

delivery at the supply registers and adjust register openings

for balanced air distribution. Examine ductwork for leaks or

obstruction if insufﬁcient air is detected. Set the thermostat

fan mode to AUTO. The blower should stop running.

System Cooling

1. Set the thermostat’s system mode to COOL and the fan

mode to AUTO. Gradually lower the thermostat temperature

setpoint below room temperature and verify the compressor,

fan and indoor blower energize.

2. Feel the air being circulated by the indoor blower and verify

that it is cooler than ambient temperature. Listen for any

unusual noises. If unusual sounds occur, determine the

source of the noise and correct as necessary.

3. Allow the cooling system to operate for several minutes and

then set the temperature selector above room temperature.

Table 4. Manifold Pressure Setting (in WC)

for Natural Gas

MANIFOLD PRESSURE (IN W.C.)

FOR NATURAL GAS INSTALLATIONS

ALTITUDE ABOVE

SEA LEVEL

HEATING VALUE BTU/CU. FT

ORIFICE

SIZE

800 TO

899 FT

900 TO

999 FT

1,000 TO

1,100 FT

Zero to 1,999 Ft. 3.5 3.5 3.5 43

2,000 to 2,999 Ft. 3.2 3.2 3.2 43

3,000 to 3,999 Ft. 2.9 2.9 2.9 43

4,000 to 4,999 Ft. 2.7 2.7 2.7 43

5,000 to 5,999 Ft. 3.5 3.5 3.5 46

6,000 to 6,999 Ft. 3.2 3.2 3.2 46

7,000 to 7,999 Ft. 3.0 3.0 3.0 46

8,000 to 8,999 Ft. 2.8 2.8 2.8 46

9,000 to 10,000 Ft. 2.6 2.6 2.6 46

Table 5. Manifold Pressure Setting (in WC)

& Oriﬁce Size for LP Gas

MANIFOLD PRESSURE (IN W.C.) AND ORIFICES

FOR LP/PROPANE GAS INSTALLATIONS

ALTITUDE ABOVE

SEA LEVEL

MANIFOLD

PRESSURE

ORIFICE

SIZE

Zero to 1,999 Ft. 10 54

2,000 to 2,999 Ft. 9.2 54

3,000 to 3,999 Ft. 8.5 54

4,000 to 4,999 Ft. 9.8 55

5,000 to 5,999 Ft. 9 55

6,000 to 6,999 Ft. 8.2 55

7,000 to 7,999 Ft. 8 55

8,000 to 8,999 Ft. 10 56

9,000 to 10,000 Ft. 9 56

Verify the fan and compressor cycle off with the thermostat.

NOTE: The blower will also stop after a 40 second delay.

System Heating

1. Set the thermostat to the lowest setting.

2. Follow the procedures given on the operating instruction

label, this manual or attached inside the louvered control

access panel.

3. Set the thermostat above room temperature and verify the

Operating Sequence. See page 17.

4. Verify that the compressor and outdoor fan motor are not

energized.

5. After the unit has run for approximately ﬁve minutes, set the

thermostat below room temperature and verify the shutdown

sequence; steps 10, 11, & 12 in the Operating Sequence

section on page 17.

Verifying & Adjusting Temperature Rise

Verify the temperature rise through the unit is within the range

speciﬁed on the unit data label. Temperature rises outside

the speciﬁed range could result in premature heat exchanger

failure.

1. Place thermometers in the return and supply air stream as

close to the unit as possible. The thermometer on the supply

air side must be shielded against direct radiation from the

heat exchanger to avoid false readings.

2. Adjust all registers and duct dampers to the desired

position. Run the unit for 10 to 15 minutes before taking any

temperature readings. The temperature rise is the difference

between the supply and return air temperatures.

NOTE: For typical duct systems, the temperature rise will fall

within the range speciﬁed on the data label (with the blower

speed at the factory recommended setting) shown in Table

8 (page 22). If the measured temperature rise falls outside

the speciﬁed range, it may be necessary to change the blower

speed. Lowering the blower speed increases the temperature

rise and a higher speed decreases the temperature rise.

The unit is equipped with a multi speed motor. On units with

ECM type motors, speed selection is made by moving the

leads on the blower motor terminal block. The speed taps

for adjusting the motor speed are shown in Table 8 (page

22). Refer to the Blower Speed section (page 12) for

additional information.

The integrated control starts the circulating air blower 30

seconds after the gas valve is opened. The control is factory

wired to turn the blower motor off 90 - 135 seconds after the

gas valve is closed.

ECM Motors: The heating blower off delay is factory set at 90

seconds. An additional 45 second off delay is programmed

into the ECM blower motor for a total of 135 seconds.

Verifying & Adjusting Firing Rate

CAUTION:

Do not re-drill the burner oriﬁces. If the oriﬁce size

must be changed, use only new oriﬁces.

The ﬁring rate must be veriﬁed for each installation to prevent

over-ﬁring of the unit. The ﬁring rate must not exceed the

rate shown on the unit data label. To determine the ﬁring

rate, follow the steps below:

1. Obtain the gas heating value (HHV) from the gas supplier.

2. Shut off all other gas ﬁred appliances.

3. Start the unit in heating mode and allow it to run for at least

3 minutes.

4. Measure the time (in seconds) required for the gas meter

to complete one revolution.

5. Convert the time per revolution to cubic feet of gas per hour

using Table 10 (page 24).

6. Multiply the gas ﬂow rate in cubic feet per hour by the

heating value of the gas in Btu per cubic foot to obtain the

ﬁring rate in Btu per hour. See Example.

Example:

• Time for 1 revolution of a gas meter with a 1 cubic foot

dial = 40 seconds.

• From Table 10, read 90 cubic feet gas per hour.

• Local heating value of the gas (obtained from gas supplier)

= 1,040 Btu per cubic foot.

• Input rate = 1,040 x 90 = 93,600 Btuh.

7. Adjust the manifold pressure if necessary. See Manifold

Pressure Adjustment below. For additional information

about elevations above 2,000 feet, see page 14.

Manifold Pressure Adjustment

The manifold pressure must be set to the appropriate value

for your installation. To adjust the manifold pressure:

1. Obtain the required manifold pressure setting using Table

4 (page 15) for natural gas or Table 5 for LP/propane

gas.

NOTE: The values listed in the tables are based on sea

level values. At higher altitudes, the heating value of gas

is lower than the sea level heating value.

2. Remove the regulator capscrew (Figure 8) from the INLET

side of the regulator.

3. Slowly turn the adjustment screw inside the regulator to

obtain the appropriate manifold pressure.

Capscrew

Inlet

Pressure

Tap

Manifold

Pressure

Tap

Figure 8. Regulator Capscrew & Tap Locations

NOTE: Turning the screw clockwise increases the pressure

and turning the screw counter-clockwise decreases the

pressure. To prevent backing the screw all the way out from

the valve, turn the screw slowly.

4. Replace and tighten the regulator capscrew over the

adjustment screw.

Verifying Over-Temperature Limit Control

Operation

1. Verify the louvered control access panel is in place and that

there is power to the unit.

2. Block the return airﬂow to the unit by installing a close-off

plate in place of or upstream of the ﬁlter.

3. Set the thermostat above room temperature and verify the

units operating sequence on page 17.

NOTE: The over-temperature limit control should turn off

the gas valve within approximately four minutes (exact time

depends on the efﬁciency of the close-off when blocking the

return air). The circulating air and combustion blowers should

continue to run when the over-temperature limit control switch

opens.

4. Remove the close-off plate immediately after the over-

temperature limit control opens. If the unit operates for more

than four minutes with no return air, set the thermostat below

room temperature, shut off power to the unit, and replace

the over-temperature limit control.

Verifying Burner Operation

WARNING:

Uninsulated live components are exposed when

louvered control access panel is removed.

1. Remove the louvered control access panel and verify there

is power to the unit.

2. Set thermostat above room temperature and observe the

ignition sequence. NOTE: The burner ﬂame should carry

over immediately between all burners without lifting off,

curling, or ﬂoating. The ﬂames should be blue, without

yellow tips. Make sure the ﬂame is drawn into the center

of the heat exchanger tube. In a properly adjusted burner

assembly, the ﬂame bends down and to the right at the end

of the heat exchanger tube. The end of the ﬂame will be

out of sight around the bend.

3. After validating ﬂame characteristics, set the thermostat

below room temperature and verify the burner ﬂame

extinguishes completely.

OPERATING SEQUENCE

The operating sequences for the heating, cooling, and fan

modes are described below. Refer to the ﬁeld and unit wiring

diagram. See Figure 11 (page 26).

Heating Mode

1. On a call for heat, the thermostat closes and applies 24

VAC to the W terminal of the control board.

2. The control board checks for continuity on the 24 VAC limit

control circuit through the over-temperature limit switch and

ﬂame rollout switch in series. If an open limit is detected,

the control board will energize the inducer blower. All other

system functions will be inoperable until the limit circuit

closes. While the limit is open, the red LED will pulse at a

rate of 1 blink per unit time.

3. The furnace control checks for continuity (24 VAC) across

the pressure switch. If the pressure switch is closed, the

heat mode sequence will not continue. If it remains closed

for 10 seconds, the red LED will ﬂash 3 times repetitively

until the fault condition clears.

4. The inducer energizes (if pressure switch is open).

5. The pressure switch will close. If the pressure switch does

not close after 10 seconds, the fault LED will ﬂash 2 times

and the inducer will continue to run until the switch is closed.

6. The inducer will pre-purge for 30 seconds and then the

igniter will start its warm-up as follows:

Initial Power up: After 30 seconds of igniter warm-up, the

gas valves (24 VAC) will open. The igniter circuit will stay

energized for 3 seconds after the gas valve opens.

After Initial Power up: The control has a programmed

adaptive ignition feature which varies the warm-up period

as follows: If ignition is successful the warm-up is reduced

by 3 seconds on each subsequent call for heat until

ignition failure occurs. Upon ignition failure, the warm-up

is increased by 3 seconds on the next try. If successful,

the timing remains ﬁxed at this level. In general, whenever

ignition failure occurs the warm-up interval is increased

by 3 seconds on the next try. And if successful, it remains

there. Minimum and maximum warm-up time limits are set

at 6 and 54 seconds.

7. The furnace control must prove ﬂame via the ﬂame sensor

5 seconds after the gas valves open. If ﬂame is sensed,

burners are on and the igniter cools off. If no ﬂame is sensed,

the gas valve closes immediately and the inducer continues

to run. A second trial for ignition (step 6) begins. If no ﬂame

is sensed on the ﬁfth try for ignition, the furnace control is

locked and the red LED will blink 4 times repetitively. The

thermostat must be opened for at least ten seconds to reset

the furnace control after a lock out. Otherwise, the furnace

will attempt another ignition sequence in 1 hour.

8. After the gas valve opens (30 seconds), the blower will

ramp to the selected airﬂow and continues to run.

9. When the thermostat has been satisﬁed, the W terminal on

the integrated control is de-energized.

10. The gas valve circuit is de-energized and the gas valve

closes.

11. The inducer motor will continue to run for the post purge

period of 25 seconds.

12. The main blower will continue to run for the BLOWER OFF

delay of 90 - 135 seconds.

13. After the BLOWER OFF timer has been satisﬁed, the

integrated control de-energizes the main circulating blower

circuit.

Cooling Mode

1. On a call for cooling, the thermostat closes applying 24 VAC

to the G & Y terminals on the low voltage terminal strip.

2. The G terminal applies 24VAC to the G terminal of the

integrated control, energizing the main circulating blower

circuit at the cooling speed.

3. The Y terminal applies 24VAC to the contactor.

4. When the thermostat is satisﬁed, the contactor and integrated

control de-energize. Compressor and outdoor fan will stop

running.

5. The circulating blower motor de-energizes after a 40 second

delay.

Fan Mode

1. On a call for fan only operation, the thermostat applies 24

VAC to the G terminal connected to the G terminal of the

integrated control.

NOTE: If a call for heat occurs, the circulating blower de-

energizes prior to normal heating cycle.

REPLACEMENT PARTS

Replacement parts are available through your distributor.

Please have the complete model and serial number of the

unit when ordering replacement parts.

ELECTRICAL:

• Capacitors • Pressure Switches

• Compressors • Relays

• Contactors • Temperature Limit Switches

• Gas Valves • Thermostats

• Ignition Controls • Time Delay Relays

• Ignitors/Flame Sensors • Transformers

MOTORS:

• Blower Motor

• Fan Motor

• Inducer Blower Motor

COMPONENTS:

• Blower Assembly • Fan Grille

• Burner Manifold • Filter/Driers

• Burners/Oriﬁces • Gaskets

• Cabinet Panels • Heat Exchanger

• Expansion Valves

EQUIPMENT MAINTENANCE

WARNING:

ELECTRICAL SHOCK, FIRE OR

EXPLOSION HAZARD

Failure to follow safety warnings exactly could

result in serious injury or property damage.

Improper servicing could result in dangerous

operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical power

to furnace.

• When servicing controls, label all wires prior to

disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

AVERTISSEMENT:

RISQUE D’ÉLECTROCUTION, D’INCENDIE

OU D’EXPLOSION

Si les consignes de sécurité ne sont pas suivies

à la lettre, cela peut entraîner la mort, de graves

blessures, un fonctionnement dangereux ou des

dommages matériels.

Un entretien inadéquat peut entraîner la mort, de

graves blessures, un fonctionnement dangereux

ou des dommages matériels.

• Avant de faire l’entretien de l’appareil de

chauffage, le débrancher de l’alimentation

électrique.

• Avant l’entretien des commandes, étiqueter tous

les ﬁls avant de les déconnecter. Rebrancher

correctement les ﬁls.

• Vériﬁer que l’appareil fonctionne correctement

après l’entretien.

CAUTION:

Use care when removing parts from this unit.

Personal injury can result from sharp metal edges

present in all equipment of sheet metal construction.

Proper maintenance is important to achieve optimum

performance from the system. The ability to properly perform

maintenance on this equipment requires certain mechanical

skills and tools. If you do not possess these skills, contact your

dealer for maintenance. Consult your local dealer about the

availability of maintenance contracts. Routine maintenance

should include the following:

CAUTION:

The unit should never be operated without a ﬁlter

in the return air system. Replace disposable ﬁlters

with the same type and size.

• Inspect, clean or replace air ﬁlters at the beginning of each

heating and cooling season, or more frequently if required.

Refer to Table 1 (page 8) for recommended external

ﬁlter sizes

• Inspect the condensate drain and outdoor coil at the

beginning of each cooling season. Remove any debris.

Clean the outdoor coil and louvers as necessary using a

mild detergent and water. Rinse thoroughly with water.

• Inspect the electrical connections for tightness at the

beginning of each heating and cooling season.

• The blower compartment should be cleaned monthly during

the heating and cooling seasons to remove any dirt and lint

that may have accumulated in the compartment or on the

blower and motor. Buildup of dirt and lint on the blower and

motor can create excessive loads on the motor resulting in

higher than normal operating temperatures and possible

shortened service life.

• Maintain heat exchanger and burners. The unit should

operate for many years without excessive scale buildup in

the heat exchanger, however, the heat exchanger, the vent

system, and the burners should be inspected and cleaned

(if required) by a qualiﬁed serviceman annually to ensure

continued safe operation. Particular attention must be given

to identify deterioration from corrosion or other sources.

• The motors for the circulating air blower, outdoor fan, and

combustion blower are pre-lubricated at the factory. No

further oiling is required for the life of this product.

• Inspect and clean the screen of the vent cover assembly at

the beginning of each heating and cooling season.

Cleaning of Heat Exchanger

WARNING:

Holes in the heat exchanger can cause products

of combustion to enter the home. Replace the heat

exchanger if leaks are found. Failure to prevent

products of combustion from being circulated into

the living space can create potentially hazardous

conditions including carbon monoxide poisoning

that could result in personal injury or death.

If the heat exchanger must be cleaned due to soot or scale

build up, follow the steps below.

1. Shut off the gas supply to the unit at the meter or at the

manual valve in the gas supply piping.

2. Turn off all power to the unit and set the thermostat to the

lowest temperature setting.

3. Remove the louvered access panel from the unit.

4. Turn the gas control knob (gas valve) to the OFF position.

See Figure 10 (page 25) for gas valve shut off instructions.

5. Disconnect the wires from the gas valve, ignitor, ﬂame

sensor, combustion air motor, ﬂame roll-out control, over-

temperature limit switch, and pressure switch.

6. Remove the silicone rubber tube from the collector pan to

the pressure switch.

7. Remove 4 nuts securing the combustion blower to the

collector pan. Remove the combustion blower.

8. Remove all screws securing the collector pan to the unit.

Remove the collector pan from the unit.

CAUTION:

To prevent damage to the unit or internal components,

it is recommended that two wrenches be used when

loosening or tightening nuts. Do not over tighten!

9. Using 2 wrenches, separate the ground-joint union in the

gas supply piping at the unit.

10. Remove the piping between the gas valve and the ground-

joint union, if necessary.

11. Remove the screws that secure the burner assembly in place

and the burner assembly. BE EXTREMELY CAREFUL

NOT TO DAMAGE THE IGNITOR WHILE REMOVING

THE BURNER ASSEMBLY.

12. Attach a round wire brush to a length of high grade stainless

steel cable, such as drain clean-out cable. Attach the other

end of the spring cable to a variable speed reversible drill.

Slowly insert and rotate the cable into the top portion of

the heat exchanger. Operate the drill alternating between

forward and reverse, working the cable in and out several

times to obtain sufﬁcient cleaning. Repeat this process at

each exchanger tube.

13. Remove all loosened debris from the heat exchanger tubes

using high pressure air and vacuum cleaner.

14. Using a light, check the condition of the upper and lower

sections of the heat exchanger tube.

15. Inspect the burners and if necessary, clean them carefully

with a soft wire brush and/or the nozzle of a vacuum cleaner.

DO NOT DAMAGE THE IGNITOR OR FLAME SENSOR

WHILE CLEANING THE BURNER.

16. Replace all the parts in reverse order from which they were

removed.

17. Follow the operating instructions found on the right side

door and the User’s Information Manual to return the unit

to operation.

Cleaning of Burners

If the burners must be cleaned, follow the steps below.

1. Shut off the gas supply to the unit either at the meter or at

a manual valve in the supply piping.

2. Turn off all power to the unit and set the thermostat to the

lowest temperature setting.

3. Remove the louvered control access panel from the unit.

4. Turn the gas control knob to the OFF position. See Figure

10 (page 25) for gas valve shut off instructions.

5. Disconnect the wires from the gas valve, ignitor, and ﬂame

sensor.

CAUTION:

To prevent damage to the unit or internal components,

it is recommended that two wrenches be used when

loosening or tightening nuts. Do not over tighten!

6. Using two wrenches, separate the ground-joint union in the

gas supply piping at the unit.

7. Remove the piping between the gas valve and the ground-

joint union (if applicable).

Table 6. Diagnostic Codes

STATUS LIGHT

(RED LED)

FAULT CONDITION

On Power On

1 Flash Limit Circuit Open

2 Flashes Pressure Switch Stuck Open with Inducer ON

3 Flashes Pressure Switch Stuck Closed with Inducer OFF

4 Flashes Ignition Failure (Check Ground)

5 Flashes

230 VAC & Neutral Reversed or

no ground

Continuous Flash False Flame or Gas Relay Shorted

Off Power Off

STATUS LIGHT

(YELLOW LED)

FAULT CONDITION

Continuous Flash Low Flame Sensor Signal

On Flame Present

8. Remove all screws securing the burner assembly to the

unit.

9. Carefully remove the burner assembly from the unit. DO

NOT DAMAGE THE IGNITER WHILE REMOVING THE

BURNER ASSEMBLY.

10. Inspect the burners for accumulated dust or debris. If

necessary carefully clean them with a soft wire brush and

a vacuum cleaner. DO NOT DAMAGE THE IGNITER

WHILE CLEANING THE BURNER.

11. Replace all the parts in reverse order from which they were

removed.

12. Follow the lighting instructions found on the lower unit

door to return the unit to operation.

13. Verify proper operation after servicing.

COMPONENT FUNCTIONS

Flame Roll-Out Control - The ﬂame roll-out control acts

to verify that the burner ﬂame is being drawn into the heat

exchanger tubes. If the burner ﬂame is not being drawn into

the heat exchanger tubes, the roll-out control will open within

several seconds and the integrated control diagnostic light

will ﬂash one time. The circulating air blower and combustion

blower will continue to operate if the ﬂame roll-out control opens.

Flame Sensor - The ﬂame sensor acts to prove that ﬂame

has carried over from the ignitor to the right-most burner. If

no ﬂame is sensed, the unit will be shut down automatically.

Gas Valve - The gas valve controls the ﬂow of gas to the

burners. When the gas valve is energized it automatically

opens and regulates the gas pressure in the manifold.

Pressure Switch - The pressure switch veriﬁes that the

inducer motor is drawing the combustion gases through the

heat exchanger tubes and venting the gases through the

vent system.

Over-Temperature Limit Control - The over-temperature

limit control prevents the air temperature leaving the unit from

exceeding the maximum outlet air temperature. If the limit

opens, the integrated control diagnostic will ﬂash one time.

The circulating air blower and combustion blower will continue

to operate if the over-temperature limit control opens.

TROUBLESHOOTING

If the unit does not operate in the cooling mode, check the

following:

• The thermostat is operating properly

• Electrical power to the unit is turned on

• The ﬁlters are not dirty

• The service doors are in place

• The 3 amp fuse is operational

• The anti-short cycle timer’s 5 minute cycle has ﬁnished.

If the unit does not operate in the heating mode, check the

following:

• The thermostat is operating properly

• Electrical power to the unit is turned on

• The ﬁlters are not dirty

• The gas is turned on and the manual shut-off valve is open

• The service doors are in place

• The ﬂame roll-out control is closed

• The diagnostic codes listed in Table 6 or on the wiring

diagram, Figure 11.

• The 3 amp fuse is operational

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