Bryant 580J D17 Service And Maintenance Instructions page 42

Gas Valve
All unit sizesare equipped with 2−stage gas valves. See
Fig. 55 for locations of adjustment screws and features.
ON/OFF
SWITCH
NPT INLET
INLET
PRESSURE TAP
Fig. 55 − Gas Valve
Fig. 54 − Unit Control Box/IGC Location
REGULATOR
COVER SCREW (2)
PLASTIC ADJUST
SCREW (2)
REGULATOR SPRING (2)
(PROPANE - WHITE
NATURAL - SILVER)
LOW STAGE
GAS PRESSURE
REGULATOR
ADJUSTMENT
NPT OUTLET
MANIFOLD
PRESSURE TAP
C12066A
42
IGC Board
Adjusting Gas Valve Pressure Settings
IMPORTANT: Leak check (using a mixture of soapy
water or leak detection fluid) all gas connections
including the main service connection, gas valve, gas
spuds, and manifold pipe plug. All leaks must be repaired
before firing the unit.
Check Unit Operation and Make Necessary
Adjustments
NOTE: Gas supply pressure at the gas valve inlet must
be within specified ranges for the fuel type and unit size.
See Tables 8, 9, 10, and 11.
1. Shut off all electrical power supply to the unit and in-
stall a lockout tag.
2. Close the manual gas shutoff valve located on the gas
supply line.
3. Remove the manifold pressure tap plug from the man-
ifold and connect a pressure gauge or manometer. See
Fig. 54.
4. Turn on the electrical supply.
IGC Board
C10337