Weil-McLain GOLD CGS 550-110-260/0508 - Manual (Page 43)

Part number 550-110-260/0508
43
GOLD CGs Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — procedure
11a
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
Never jumper (bypass) rollout thermal fuse element or any other
device except for momentary testing as outlined in Troubleshooting
Charts . Severe personal injury, death or substantial property damage
can result.
Before troubleshooting:
1. Have the following items:
a. Voltmeter that can check 120 VAC and 24 VAC.
b. Microammeter with a minimum scale range of 0-25.
c. Continuity checker.
d. U-tube manometer.
2. Check for 120 VAC (minimum 102 VAC to maximum 132 VAC) to boiler.
3. Make sure thermostat is calling for heat and contacts (including appropriate zone
controls) are closed. Check for 24 VAC between thermostat wire nuts and ground.
Check the following:
1. Wire connectors to control module are securely plugged in at module and originating
control.
2. Air pressure switch hoses are properly and securely plugged in and are not dam-
aged.
3. Gas pressures:
a. With boiler off — 13” w.c. maximum natural or propane gas pressure up-
stream of gas valve.
b. With boiler on:
• 5” w.c. minimum natural gas pressure or 11” w.c. propane gas pressure
upstream of gas valve.
• 3 ½” w.c. minimum natural gas pressure or 10” w.c. propane gas pressure
downstream of gas valve — Can be adjusted by regulator on gas valve.