7. Install new natural gas valve to manifold.
NOTE:
Use propane-gas-resistant pipe dope to prevent gas leaks. DO NOT use Teflon tape.
8. Reinstall main burners on manifold. Burners should be installed left to right to ensure proper alignment of the burner crossover slot. (See
Fig. 5 for ignitor position.)
9. Reinstall burner hold-down bracket.
10. Reconnect wires to gas valve. See wiring label on furnace to ensure proper location of wires.
11. If a LGPS was removed with propane gas valve, rewire unit low-pressure switch as follows:
a. Disconnect and discard yellow wire and splice connector attached to yellow wire from PL1-5 on control board.
b. Disconnect and discard yellow wire attached to NO terminal of low-pressure switch LPS.
c. Connect yellow wire from PL1-5 on control board to NO terminal of low-pressure switch LPS.
d. Refer to wiring label on furnace to ensure proper location of wires.
12. Reconnect gas supply line to gas valve.
NOTE:
Use propane-gas-resistant pipe dope to prevent gas leaks. DO NOT use Teflon tape.
PROCEDURE 3—CHECK INLET GAS PRESSURE
NOTE:
This kit is to be used only when inlet gas pressure is between 4.5- and 13.6-in. wc.
1. Be sure main gas and electrical supplies to furnace are off.
2. Remove 1/8-in. pipe plug from inlet pressure tap on gas valve. (See Fig. 4.)
3. Attach manometer to inlet pressure tap on gas valve. (See Fig. 17.)
4. Turn on furnace power supply.
5. Jumper R and W2 thermostat connections on control. (See Fig. 6.) This keeps furnace locked in high-heat operation.
CAUTION: DO NOT operate furnace more than 1 minute to check inlet gas pressure as conversion is not complete at
this time.
6. Turn gas supply manual shutoff valve to ON position.
7. Turn furnace gas valve control knob or electric switch to ON position.
8. When main burners have ignited, confirm inlet gas pressure is between 4.5- and 13.6-in. wc.
9. Remove jumper across R and W2 thermostat connections to terminate call for heat.
Fig. 4—Redundant Automatic 2-Stage Gas Valve
A97484
ON
O
F
F
ON/OFF
SWITCH
INLET
PRESSURE
TAP
BURNER ENCLOSURE
REFERENCE PRESSURE TAP
(VARIABLE-SPEED, CONDENSING
FURNACES ONLY)
MANIFOLD
PRESSURE
TAP
LOW-FIRE
ADJUSTMENT
ALLEN SCREW
(UNDER CAP)
HIGH-FIRE
ADJUSTMENT
ALLEN SCREW
(UNDER CAP)
INSERT PLUG
BUTTON FROM
NATURAL GAS
VALVE AFTER
REMOVING
PRESSURE TAP
(2-STAGE AND
VARIABLE–SPEED,
NON–CONDENSING
FURNACES ONLY)
Fig. 5—Position of Ignitor to Burner
A93347
BURNER
IGNITOR
11 32
"
7 8
"
C
L
C
L
IGNITOR
ASSEMBLY
CELL
PANEL
BURNER
13 32
"
HOT
SURFACE
IGNITOR
ASSEMBLY
—11—
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