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.
Table 2 (page 3), provides the manifold pressure for altitudes
above 2,000 feet.
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 1) 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 a low NOx furnace from natural gas
to LP/Propane gas, it is necessary to remove the NOx
Baffles from the furnace.
• 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.
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 Box
Door
Screws
(X4)
ON/OFF
Switch
Screws
(X4)
Burners
