Bryant 310JAV Installation, start-up, operating, and service and Instruction Manual download pdf (Page 6)

B. Pre-Adjust 2-Stage Gas Valve

NOTE: The following furnaces with Fig. 6D type valves, DO NOT need to have the regulator spring replaced in the gas valve, but the valve

MUST be pre-adjusted for propane applications. The following furnaces with Fig. 6C type valves must have both springs replaced and the valve

MUST be pre-adjusted:

CAUTION:

UNIT DAMAGE HAZARD

Failure to follow this caution may result in excess underfire and flashback.

The gas valve must be pre-adjusted before operating on propane gas. If left this way sooting and corrosion will occur leading to early

heat exchanger failure.

FOR FIG. 6C

1. Be sure gas and electrical supplies to furnace are off.

2. Remove caps that conceal adjustment screws for high- and low-heat stage gas-valve regulators. (See Fig. 6C.)

3. Turn low-heat stage adjusting screw clockwise (in) 9.5 turns. This will increase the manifold pressure closer to the propane low-heat set

point.

4. Turn high-heat stage adjusting screw clockwise (in) 13.5 turns. This will increase the manifold pressure closer to the propane high-heat

set point. Replace caps that conceal gas-valve regulator adjustment screws. Go to Procedure 3.

FOR FIG. 6D

1. Be sure gas and electrical supplies to furnace are off.

2. Remove caps that conceal adjustment screws for high- and low-heat stage gas-valve regulators. (See Fig. 6C.)

3. Turn low-heat stage adjusting screw (3/32-in. hex allen wrench) clockwise (in) 1 full turn. This will increase the manifold pressure closer

to the propane low-heat set point.

Fig. 5—NOx Device Location

A02195

REGULATOR SPRING

(PROPANE – WHITE, 6 TURNS

NATURAL – SILVER, 10 TURNS)

REGULATOR

ADJUSTMENT

SCREW

REGULATOR

SEAL CAP

GAS PRESSURE

REGULATOR

ADJUSTMENT

INLET

PRESSURE TAP

ON AND

OFF SWITCH

MANIFOLD

PRESSURE TAP

A01073

Fig. 6A—Single-Stage Gas Valve

REGULATOR

SEAL CAP

REGULATOR

ADJUSTMENT

SCREW

REGULATOR SPRING

(PROPANE - WHITE, 8.5 TURNS

NATURAL - SILVER, 8.5 TURNS)

GAS PRESSURE

REGULATOR

ADJUSTMENT

MANIFOLD

PRESSURE TAP

NLET

RESSURE TAP

ON/OFF SWITCH

A04112

→ Fig. 6B—Single-Stage Gas Valve

58CTA 312AAV 58CVA 315AAV

58CTX 312JAV 58CVX 315JAV

—6—

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Bryant 310JAV Installation, start-up, operating, and service and Instruction Manual Page 6

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