LP & HIGH ALTITUDE LP GAS CONVERSION KIT
FOR INSTALLATIONS IN CANADA
INSTALLATION INSTRUCTIONS
IMPORTANT: Please read all instructions before converting
the furnace. 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.
These conversion instructions are only to be used to convert
natural gas furnaces to LP/Propane gas in Canada. This kit may
only be used in furnaces installed in altitudes between zero and
4,500 feet above sea level. For U.S. installations, the United
States conversion instructions must be used.
Table 1 is a detailed listing of the components in the LP gas
conversion kit. Please check the contents of the conversion kit
with that of the parts listing, and familiarize yourself with each
component.
For MG2S Series Furnaces & Appliances Using Honeywell Gas Valves
The installer performing this work assumes all responsibility for this conversion. These instructions are primarily intended to assist qualified
individuals experienced in the proper installation of these components. Some local codes require licensed installation/service personnel for this
type of equipment. Safety should always be the deciding factor when installing this product and using common sense plays an important role as
well. Improper installation of the components or failure to follow safety warnings could result in serious injury, death, or property damage. After
completing the installation, return these instructions to the Homeowner’s Package for owner-user’s future reference.
Table 1. LP Gas & High Altitude Conversion Kit
DESCRIPTION QTY
Honeywell Conversion Kit 50033841
(to convert VR9205Q1127)
1
#48 Drill Size Burner Orifice Kit (661048)
Included with 60,000 Btu Models (Contains 3)
1
#49 Drill Size Burner Orifice Kit (661049)
Included with 72,000 Btu Models (Contains 4)
1
#51 Drill Size Burner Orifice Kit (661051)
Included with 45,000 Btu Models (Contains 3)
1
#59 Drill Size Burner Orifice Kit (661059)
Included with 45,000 Btu Models (Contains 3)
1
1.1mm Burner Orifice Kit (661078)
Included with 45,000 Btu Models (Contains 3)
1
1.1 mm Burner Orifice Kit (661078)
Included with 60,000 Btu Models (Contains 3)
1
1.1mm Burner Orifice Kit (661078)
Included with 72,000 Btuh Models (Contains 4)
1
1.2mm Burner Orifice Kit (661079)
Included with 72,000 Btuh Models (Contains 4)
1
1.25 mm Burner Orifice Kit (661082)
Included with 60,000 Btu Models (Contains 3)
1
Conversion Warning Label
1
Conversion Information Label
1
Installation Instructions
1
DO NOT DESTROY THIS MANUAL. KEEP IN A
SAFE PLACE FOR FUTURE REFERENCE.
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.
WARNING:
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.
AVERTISSEMENT
2
CONVERTING TO LP / PROPANE GAS
(AT ALTITUDES BETWEEN ZERO & 4,500 FT.)
Converting 2 - stage valves to LP/Propane requires the
replacement of the burner orifices and/or the stem/spring
assembly in the pressure regulator. All furnace models need to
be derated when converted to LP.
Table 2 (page 3), provides the manifold pressure for altitudes
above 2,000 feet as well as the derated inputs.
WARNING:
Shut off the gas supply at the manual gas shutoff
valve, before disconnecting the electrical power.
A fire or explosion may result causing property
damage, personal injury or loss of life. Failure to
follow the safety warnings exactly could result in
serious injury, death or property damage.
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
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.
Before You Convert the Gas Valve
1. Set the thermostat to the OFF position, or its lowest temperature
setting.
2. Shut OFF the gas supply at the manual shutoff valve located
outside of the appliance.
3. Turn off all electrical power to the appliance.
Converting the Gas Valve
1. STOP! Read steps 1 thru 3 in the “Before you Convert the
Gas Valve” section above.
2. Remove the door from the burner compartment.
3. Move the gas valve ON/OFF switch (see Figure 3) to the OFF
position.
4. Remove the wires from the terminals of the gas valve.
5. Remove the supply gas piping from the gas valve inlet.
6. Carefully remove 4 screws securing the gas manifold assembly
to the burner assembly.
7. Set the screws aside and remove the gas manifold assembly
from the appliance.
IMPORTANT NOTES:
• When converting to LP/Propane gas from natural gas, the
springs from gas valve must be replaced by the larger
springs from the kit. The LP/Propane springs for both
HIGH & LOW fire are the same size, shape and color.
• Use only a Torx-25 (included with this kit) or 3/16” flathead
screwdriver when removing adjustment screws or during
pressure adjustment.
8. Remove the HIGH fire cap screw. See Figure 2 (page 3).
9. Remove and discard the HIGH fire adjustment screw from
the gas valve.
10. Remove the spring from the gas valve and discard.
11. Install a larger spring from the conversion kit.
12. Install a new adjusting screw from the kit.
13. Repeat steps 8 thru 12 for replacement of the LOW fire spring
and adjustment screw.
14. Check and adjust the regulator setting. See Gas Pressure
Adjustment Section.
15. Reinstall the cap screws on the HIGH and LOW regulators.
Replacement cap screws are provided in the conversion kit.
16. Affix the label from the conversion kit to the gas valve.
Removing The Burner Orifices
1. Carefully remove the burner orifices from the gas manifold
assembly.
2. Read the rating plate affixed to the appliance to determine
its rated input (Btu/hr) and the size of the factory installed
orifices.
IMPORTANT NOTE: Before installing an orifice, check the
side or face of the orifice for the drill number to ensure that
it is the appropriate size.
3. Install the appropriate LP/Propane gas burner orifices into
the gas manifold assembly.
WARNING:
All gas piping must conform with local building
codes, or in the absence of local codes, with the
most recent edition of CGA B149.1. DO NOT attempt
to modify, or tap into existing gas lines yourself. Fire
or explosion may result causing property damage,
personal injury or loss of life. Failure to follow the
safety warnings exactly could result in serious injury,
death or property damage.
WARNING:
All electrical wiring must comply with the latest
edition of the Canadian Electrical Code (CSA
C22.1 and/or local codes). Failure to follow these
instructions could result in possible damage to
equipment, serious personal injury, or death.
Figure 1. Burner & Manifold Assembly
Burner
Box
Orifice
(X4)
Gas
Valve
Gas
Manifold
Burner Bo
x
Door
Screws
(X4)
ON/OFF
Switch
Screws
(X4)
Burners
3
NOTE: To prevent cross threading, hand tighten the orifices into
the gas manifold assembly until snug, then tighten with a wrench.
WARNING:
Do not use Teflon tape or pipe joint compound
on the orifice threads. The hole in the orifice may
become blocked and cause fire, explosion, property
damage, carbon monoxide poisoning, personal
injury, or death.
4. Reinstall the gas manifold assembly to the burner assembly
with the 4 screws, that were removed earlier. NOTE: It is
important that the center of the orifices are aligned with the
center of the burners.
5. Reconnect the gas piping to the gas valve inlet.
6. Reconnect the wires to the gas valve terminals.
HIGH ALTITUDE CONVERSION
(FOR NATURAL GAS INSTALLATIONS AT
ALTITUDES BETWEEN 2,000 & 4,500 FT)
When converting to high altitude with natural gas, conversion
requires replacement of the burner orifices and/or adjustment
of the manifold pressure. For detailed instructions, refer to the
“High Altitude Application” section of the Installation Instructions
supplied with the furnace.
GAS PRESSURE ADJUSTMENT
Measuring the Supply Gas Pressure
1. Turn OFF the gas supply at the manual valve located on the
outside of the unit.
2. Using a 3/16“ Allen wrench, remove the plug from the inlet
pressure tap (INLET side of gas valve). See Figure 3.
3. Install an 1/8” NPT pipe thread fitting, which is compatible
with a Manometer or similar pressure gauge.
4. Connect the Manometer or pressure gauge to the Inlet Pressure
Ta p.
5. Turn ON the main gas supply at the manual valve.
6. Check and adjust the incoming gas line pressure to 11.0-14.0
inches Water Column for LP/Propane gas.
7. Turn OFF the gas supply at the manual valve.
8. Disconnect the Manometer or pressure gauge.
9. Remove the NPT fitting and reinstall the INLET pressure tap
plug. Hand tighten the plug first to prevent cross-threading.
Tighten with 3/16” Allen wrench.
High Fire
Cap Screw
High Fire
Adjustment Scre
w
Low Fire
Cap Screw
Low Fire
Adjustment Scre
w
Spring
Spring
Figure 2. Gas Valve Conversion
Figure 3. Inlet & Manifold Pressure Tap Locations
Inlet
Pressure
Ta p
Manifold
pressure
Ta p
Model VR9205Q1127
ON/OFF
Switch
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.
WARNING:
RISQUE D’INDENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité
pourrait d’entraîner des blessures graves, la mort
ou des dommages matériels.
Ne jamais utiliser une flamme nue por
vérifier la présence des fuites de gaz. Pour la
vérification de tous les joints, utiliser plutôt une
solution savonneuse commerciale fabriquée
spécifiquement pur la détection des fuites de gaz.
Un incendie ou une explosion peut entraîner des
dommages matériels, des blessures ou la mort.
AVERTISSEMENT:
Lighting & Adjustment of the Appliance
1. Turn ON the manual gas valve, located on the outside of the
unit to the ON position.
2. Check all gas connections for leaks with a soap and water
solution. If the solution bubbles there is a gas leak which must
be corrected.
3. Turn on the electrical power to the appliance.
4. Place the gas valve ON/OFF switch/knob to the ON position.
See Figure 3.
5. Set the thermostat above room temperature to begin the
heating cycle of the furnace.
6. Check that the furnace ignites and operates properly. Refer
to the installation instructions provided with the unit for the
normal operating sequence.
7. After ignition, visually inspect the burner assembly to ensure
that the flame is drawn directly into the center of the heat
exchanger tube. In a properly adjusted burner assembly, the
flame color should be blue with some light yellow streaks near
the outer portions of the flame.
NOTE: The ignitor may not ignite the gas until all air is bled
from the gas line. If the ignition control locks out, turn the
thermostat to its lowest setting and wait one minute then turn
the thermostat above room temperature and the ignitor will
try again to ignite the main burners. This process may have
to be repeated several times before the burners will ignite.
After the burners are lit, check all gas connections for leaks
again with the soap and water solution.
Measuring the Manifold Pressure
The manifold pressure must be measured by installing a pressure
gauge (Manometer, Magnehelic Meter, etc.) to the outlet end of
the gas valve as follows:
1. Turn off all electrical power to the appliance.
2. Shut OFF the gas supply at the manual shutoff valve located
outside of the appliance.
3. Using a 3/16” Allen wrench, remove the manifold pressure tap
plug located on the outlet side of the gas valve. See Figure
3 (page 3).
4. Install an 1/8” NPT pipe thread fitting, that is compatible with
a Manometer or similar pressure gauge.
5. Connect the Manometer or pressure gauge to the manifold
pressure tap.
6. Set the room thermostat above room temperature to start the
furnace.
7. Allow the furnace to operate for 3 minutes and then check
the manifold pressure. Compare the measured value with the
value shown in Table 2 (page 3). If the manifold pressure is
not set to the appropriate pressure, then it must be adjusted.
Adjusting the Manifold Pressure
NOTE: Adjustments must be made to both LOW & HIGH fire
settings when converting two-stage gas valves. Refer to Table
2 for manifold pressures.
1. Using the supplied Torx-25 Wrench, slowly turn the adjustment
screw till the appropriate manifold pressure listed in Table 2
is achieved. See Figure 2.
NOTE: Turning the screw clockwise increases the pressure,
turning the screw counter-clockwise decreases the pressure.
To prevent the screw from backing all the way out from the
valve, turn the screw slowly.
2. Replace and tighten the cap screw over the adjustment screw.
Removing the Manometer / Pressure Gauge
After the manifold pressure is properly adjusted, the Manometer
or pressure gauge must be removed from the gas valve.
1. Turn the thermostat to its lowest setting.
2. Turn OFF the main gas supply to the unit at the manual shut-
off valve, which is located outside of the unit.
3. Turn OFF all of the electrical power supplies to the unit.
4. Remove the pressure gauge adapter from the gas valve and
replace it with the 1/8” NPT manifold pressure plug that had
been removed earlier. NOTE: Make sure the plug is tight and
not cross-threaded.
5. Turn ON the electrical power to the unit.
6. Turn ON the main gas supply to the unit at the manual shut-
off valve.
COMPLETING THE CONVERSION
WARNING:
Do not alter or remove the original rating plate from
the furnace.
1. Attach the following labels:
• The conversion warning label (P/N 703935) should be
affixed to the outside of the unit door.
• The conversion information label (P/N 711298) should be
affixed near the rating plate on the inside of the control
area.
• The gas valve conversion label should be affixed on the
gas valve.
NOTE: Each label should be prominently visible after installation.
2. Reinstall the appliance door.
3. Run the appliance through 3 complete cycles to assure proper
operation.
Table 2. Liquid Propane Conversion Chart
INPUT
(BTU)
ALTITUDE ABOVE SEA LEVEL
0 to 1,999 FT 2,000 to 4,500 FT
Orifice
Size
ManifOld PreSSure
Orifice
Size
ManifOld PreSSure
HigH lOw HigH lOw
39,000
1.1
(mm)
10.0 In.
W.C.
4.2 In.
W.C.
1.1
(mm)
8.5 In.
W.C.
3.8 In.
W.C.
57,000
1.25
(mm)
10.0 In.
W.C.
4.2 In.
W.C.
1.25
(mm)
8.5 In.
W.C.
3.8 In.
W.C.
63,000
1.2
(mm)
10.0 In.
W.C.
4.2 In.
W.C.
1.2
(mm)
8.5 In.
W.C.
3.8 In.
W.C.
Specifications & illustrations subject to change without notice or incurring obligations (12/20).
O’Fallon, MO, © Nortek Global HVAC LLC 2020. All Rights Reserved.
10349120
(Replaces 10229100)
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dans d''autres langues
- English: Miller MG2S Installation guide
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