Troubleshooting - Weil-McLain GOLD CGI 550-110-710/0107 User Manual

GOLD CGi Gas-Fired Water Boiler — Boiler Manual
11a
Troubleshooting — procedure
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and danger-
ous operation.
Never jumper (bypass) rollout thermal fuse element
or any other device except for momentary testing as
outlined in
injury, death or substantial property damage can re-
sult.
Before troubleshooting:
1. Have the following items:
a. Voltmeter that can check 10 VAC and 4 VAC.
b. Microammeter with a minimum scale range of 0-5.
c. Continuity checker.
d. U-tube manometer.
. Check for 10 VAC (minimum 10 VAC to maximum 13 VAC) to
boiler.
3. Make sure thermostat is calling for heat and contacts (including appro-
priate zone controls) are closed. Check for 4 VAC between thermostat
wire nuts and ground.
11b
Troubleshooting — components
Air pressure switch
Make sure boiler water temperature is 100 °F or cooler
before starting procedure to obtain appropriate read-
ings.
The boiler will not operate correctly unless pressure
switch hoses are correctly located. The red hose con-
nects from the right side (negative) hose barb to the
flue collector. The white hose connects from the left
side (positive) hose barb of the switch to the connector
box (between flue collector and inducer) as shown in
Figure 36
Check pressure switch setting
1. See Figure 36 page 49, and
,
. Remove both air pressure switch hoses from air pressure switch.
3. Install tees and tubing as shown in
eter.
4. Turn off gas valve and set thermostat to call for heat. Inducer will run but burn-
ers will not ignite.
5. Check for 4 VAC between both air pressure switch terminals.
Troubleshooting air pressure reading
1. If manometer reading is lower than the setpoint of the switch (see
— check for possible causes:
• blockage in hoses
• obstruction in inducer housing outlet
48
Troubleshooting Charts
, page 49.
Table 9 .
Figure 36 , page 49, to inclined manom-
Check the following:
1. Wire connectors to control module are se-
curely plugged in at module and originating
control.
. Air pressure switch hoses are properly and
. Severe personal
securely plugged in and are not damaged.
3. Gas pressures:
a. With boiler off — 13" w.c. maximum
b. With boiler on:
• loose inducer wheel on motor shaft
• inducer motor not in proper rpm
• inducer back plate not sealed properly
• blockage in block assembly
6. If manometer reading is above the setpoint of the switch
(see Table 9
pressure switch terminals — replace air pressure switch.
Return to normal operation
When pressure reading is correct and air pressure switch is
operating properly — remove tees and reinstall hoses to air
pressure switch.
Table 9
Table 9
)
natural or propane gas pressure up-
stream of gas valve.
• 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.
), but there is not 4 VAC between both air
Pressure switch setpoint (for elevations
above 2,000 ft, contact your local Weil-
McLain sales office for details.)
Part Number 550-110-710/0107