Weil-McLain GOLD CGt Manual page 46

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — components
Check pressure switch
setting
1. See Figure 33.
. Remove both air pressure switch hoses from air
pressure switch.
3. Install tees and tubing as shown in Figure 33 to
inclined manometer.
4. Turn off gas valve and set thermostat to call for heat.
Inducer will run but burners will not ignite.
5. Check for 4 VAC between both air pressure switch
terminals.
6. If manometer reading is above the setpoint of the
switch, but there is not 4 VAC between both air
pressure switch terminals — replace air pressure
switch.
Pressure switch setpoint
1. The air pressure switch should drop out when the
pressure across switch is less than 1.53 inches w.c.
Figure 33 Manometer connections
46
Troubleshooting air pressure
reading
1. If manometer reading is lower than the setpoint of
the switch — check for possible causes:
• blockage in hoses
• obstruction in inducer housing outlet
• loose inducer wheel on motor shaft
• inducer motor not in proper rpm
• inducer back plate not sealed properly
• blockage in block assembly
• blockage in flue pipe or termination
• incorrect 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.
The boiler will not operate correctly
unless pressure switch hoses are cor-
rectly located. The red hose connects
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 33
Ambient temperature switch
The ambient temperature switch wires into the boiler
limit circuit. If the temperature in the vicinity of the
switch exceeds 135°F, the switch will shut down the
boiler.
If the switch shuts down the boiler, check the reason for
the high temperature in the space. Increase the size of
the ventilation air openings if necessary.
Part Number 550-110-290/0107
.