4. Route yellow wires along wire harness. Secure with wire tie provided in kit. Go to Procedure 6.
B.
2-Stage and Variable Speed
1. Disconnect yellow wire from the N.O. contact of the low-heat pressure switch LPS and connect it to the N.O. terminal on the low gas
pressure switch, LGPS.
2. Connect insulated straight terminal of 16-in. yellow wire (provided in kit) to C terminal on low gas pressure switch LGPS.
3. Connect insulated flag terminal of 16-in. yellow wire to N.O. terminal to low pressure switch LPS.
4. Route yellow wires along wire harness. Secure with wire tie provided in kit. Go to Procedure 6.
PROCEDURE 6—CHECK FURNACE OPERATION AND MAKE NECESSARY ADJUSTMENTS
1. Be sure main gas and electric supplies to furnace are off.
2. Remove 1/8-in. pipe plug from manifold pressure tap on downstream side of gas valve. (See Fig. 6A or 6B.)
3. Attach manometer to manifold pressure tap on gas valve.
NOTE:
The 1/8 inch NPT street ell included in the kit may be attached to the gas valve manifold pressure tap or a field supplied 90 degree 1/8
inch NPT barbed fitting may be simplify manometer connection to gas valve when vent connector passes inside furnace casing. (See Fig 9.) The
street ell may be left in place on gas valve when plug from manifold pressure tap in installed in street ell.
4. Turn gas supply manual shutoff valve to ON position.
5. Turn furnace gas valve switch to ON position.
6. Check all threaded pipe connections for gas leaks.
7. Turn on furnace power supply.
WARNING: FIRE, EXPLOSION, INJURY OR DEATH HAZARD
Failure to follow this warning could result in fire, explosion, personal injury, or death.
NEVER use matches, candles, flame, or other sources of ignition to check for gas leakage. Use a soap-and-water solution to check
for leaks.
PROCEDURE 7—SET GAS INPUT RATE
The gas-input rate for propane is the same as for natural gas. See furnace rating plate for input rate. The input rate for propane is determined by
manifold pressure and orifice size. On two-stage furnace models, the gas-valve regulator must be set for high heat and set for low heat. (See kit
rating plate 327697-204 Rev. B, Fig. 10.)
Gas input rate on furnace rating plate is for installations at altitudes up to 2000 ft. In the U.S.A., the input rating for altitudes above 2000 ft must
be reduced by 4 percent for each 1000 ft above sea level.
In Canada, the input rating must be derated by 10 percent for altitudes of 2000 ft to 4500 ft above sea level.
The Conversion Kit Rating Plate accounts for high altitude derate.
A.
Single Stage Furnaces
1. Jumper R and W thermostat connections to call for heat. (See Fig. 8A or 8B.)
2. Check manifold orifices for gas leaks when main burners ignite.
3. Adjust gas manifold pressure.
NOTE:
Gas valve regulator seal cap MUST be in place when checking input rate.
a. Turn adjusting screw counterclockwise (out) to decrease manifold pressure or clockwise (in) to increase manifold pressure. (See Fig. 6A
or 6B.)
NOTE:
Gas valve regulator seal cap MUST be in place when checking input rate.
b. When correct input is obtained, main burner flame should be clear blue, almost transparent. Be sure regulator seal cap is in place when
finished.
4. Remove jumper across R and W thermostat connections to terminate call for heat.
5. Turn furnace gas valve control switch or control knob to OFF position.
6. Turn off furnace power supply.
7. Remove manometer and replace manifold pressure tap plug. (See Fig. 6A or 6B.)
NOTE:
Use propane-gas-resistant pipe dope to prevent gas leaks. DO NOT use Teflon tape.
8. Turn furnace gas valve control switch or control knob to ON position.
9. Turn on furnace power supply.
10. Set room thermostat to call for heat.
11. Check manifold pressure tap plug for gas leaks when main burners ignite.
12. Observe unit operation through 2 complete heating cycles. See sequence of operation in furnace Installation, Start-up and Operating
Instructions.
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