3. Attach manometer to inlet pressure tap on gas valve. (See Fig. 17.)
CAUTION: DO NOT operate furnace more than 1 minute to check inlet gas pressure as conversion is not complete at
this time.
4. Turn on furnace power supply.
5. Turn gas supply manual shutoff valve to ON position.
6. Turn furnace gas valve switch to ON position.
7. Jumper R-W/W1 and R-W2 thermostat connections on control. (See Fig. 6.) This runs the furnace in high heat.
8. When main burners ignite, confirm inlet gas pressure is between 11.0-in. wc and 13.6-in. wc.
9. Remove jumper across R-W/W1 and R-W2 thermostat connections to terminate call for heat.
10. Turn furnace gas valve switch to OFF position.
11. Turn gas supply manual shutoff valve to OFF position.
12. Turn off furnace power supply.
13. Remove manometer, but do not reinstall gas-valve inlet pressure-tap plug. (See Fig. 3.)
PROCEDURE 4—INSTALL LOW GAS PRESSURE SWITCH (LGPS)
NOTE:
The inlet gas pipe must be disconnected from valve so pressure switch can be installed.
NOTE:
Use propane-gas-resistant pipe dope on all connections to prevent gas leaks. DO NOT use Teflon tape.
Fig. 1—Upflow and Upflow/Horizontal, 2-Speed and Variable-Speed, Non-Condensing Furnace Components and Conversion
Label Location
A99219
CONVERSION
RESPONSIBILITY
LABEL
CONVERSION
RATING
PLATE
BURNERS
CLEARANCE LABEL
FURNACE
RATING
PLATE
BURNER
HOLD–DOWN
BRACKET
MANIFOLD
GAS VALVE
GAS CONTROL
CONVERSION LABEL
Fig. 2—Downflow and Downflow/Horizontal, 2-Speed, Non-Condensing Furnace Components and Conversion Label
Location
A99220
CLEARANCE LABEL
GAS VALVE
BURNER
HOLD–DOWN
BRACKET
CONVERSION
RESPONSIBILITY
LABEL
CONVERSION
RATING
PLATE
MANIFOLD
BURNERS
FURNACE
RATING
PLATE
GAS CONTROL
CONVERSION LABEL
—4—
