Weil-McLain GOLD CGS 550-110-260/02002 - Manual (Page 41)

Part number 550-110-260/0200
41
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.
VERIFY PROPER OPERATION AFTER SERVICING.
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. Inclined manometer with 0 – 2" w.c. range.
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 damaged.
3. Gas pressures:
a. With boiler off — 13" w.c. maximum natural or propane gas
pressure upstream of gas valve.
b. With boiler on:
• 5" w.c. natural gas pressure or 11" w.c. propane gas pressure
upstream of gas valve.
• 3 ½" w.c. natural gas pressure or 10" w.c. propane gas pressure
downstream tapping on gas valve — Can be adjusted by
regulator on gas valve.
Before troubleshooting: