Bryant 310JAV Installation, start-up, operating, and service and Instruction Manual download pdf (Page 8)

PROCEDURE 4—CHECK INLET GAS PRESSURE

NOTE: This kit is to be used only when inlet gas pressure is between 11.0-in. w.c. and 13.6-in. w.c.

Verify manometer is connected to the open end of the brass tee installed in the gas valve. (See Fig. 7A and 7B.)

CAUTION:

UNIT DAMAGE HAZARD

Failure to follow this caution may result in flame rollout, overheating the heat exchangers, etc. and reduce unit life.

DO NOT operate furnace more than 1 minute to check inlet gas pressure, as conversion is not complete at this time.

For Two-Stage furnaces, perform the following on the control board:

Turn LHT switch on furnace control to ON (See. Fig. 8C.)

For Variable Speed furnaces, perform the following on the control board:

Turn Setup Switch SW1-2 on furnace control ON (See Fig. 8D.)

1. Turn on furnace power supply.

2. Turn gas supply manual shutoff valve to ON position.

3. Turn furnace gas valve switch to ON position.

4. Jumper R-W thermostat connections on the Single Stage furnace control (See Fig. 8A or 8B.) or

Jumper R-W/W1 and R-W2 thermostat connections on the 2-Stage and Variable Speed furnace control (See Fig. 8C or 8D.) The two-stage

algorithm must be removed to force furnace to high heat operation.

5. When main burners ignite, confirm inlet gas pressure is between 11.0-in. w.c. and 3.6-in. w.c.

6. Remove jumper across thermostat connections to terminate call for heat.

7. Turn furnace gas valve switch to OFF position.

8. Turn gas supply manual shutoff valve to OFF position.

9. Turn off furnace power supply.

10. Remove manometer.

11. Apply pipe dope sparingly to end of inlet gas pipe plug and install in unused end of 1/8″ tee. Use a small back-up wrench on tee when

tightening gas inlet pipe plug. (See Fig. 7A or 7B.)

PROCEDURE 5—MODIFY PRESSURE SWITCH WIRING (REFER TO FURNACE WIRING DIAGRAM)

A. Single Stage

1. Disconnect yellow wire from the N.O. contact of the pressure switch PRS and connect it to the N.O. terminal on the low gas pressure switch,

LGPS.

2. Connect the insulated straight terminal of the 16-in. yellow wire (provided in kit) to the C terminal on the low gas pressure switch, LGPS.

3. Connect insulated flag terminal of 16-in. yellow wire to the N.O. terminal to pressure switch PRS.

Fig. 7A—Gas Valve Inlet Pressure Trap

A02198

1/8” brass coupling

Brass tee . . .

install LPGS

Fig. 7B—LGPS Installed

A02211

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Bryant 310JAV Installation, start-up, operating, and service and Instruction Manual Page 8