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Part Number 550-142-300/0520
48
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — procedure (continued)
Check the following:
1. Wire connectors to control module are securely
plugged in at module and originating control.
2. 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. minimum natural gas pressure or
11” w.c. propane gas pressure upstream of
gas valve.
• 3.5” w.c. minimum natural gas pressure or
10” w.c. propane gas pressure downstream
tapping on gas valve — Can be adjusted by
regulator on gas valve.
In event of vent damper
failure:
Effikal or Field Controls damper
If troubleshooting chart recommends replacing actua-
tor and actuator is not immediately available, damper
blade can be fixed in an open position to allow boiler
operation. Manually turning blade can cause actuator
damage. Follow these instructions only in case of no
heat or damper actuator malfunction.
1. Move damper service switch to
Hold Damper Open
position. Apply call for heat to boiler. Damper blade
should then rotate to open position and boiler will
fire.
2. If step 1 does not open damper, manually rotate
damper blade to open position using wrench or
• Verify proper operation after servicing. • See vent damper manufacturer’s instructions packed with vent damper
for additional information. Failure to comply could result in severe personal injury, death or substantial property
damage.
Figure 28 Manually
opening the
vent damper
pliers on flat shaft between damper and actuator.
Boiler will fire. Verify that damper service switch is
in Hold Damper Open position. (Figure 28)
3.
Do not leave vent damper permanently in this
position.
Replace actuator immediately. If vent
damper is left in open position, boiler will not oper-
ate at published efficiencies.
If troubleshooting chart recommends replacing actua-
tor and actuator is not immediately available, damper
blade can be fixed in an open position to allow boiler
operation. Follow these instructions only in case of no
heat or damper actuator malfunction. See
Figure 28.
1. Turn off power to boiler.
Failure to turn off power to boiler can
result in severe personal injury, death
or substantial property damage.
2. Refer to vent damper manufacturer’s instructions
for procedure to fix vent damper in open position.
3. Turn on power to boiler.
4. Using wrench or pliers on flat shaft section, manu-
ally rotate damper blade until green light turns on.
Boiler will fire. (
Figure 28)
5. Do not leave vent damper permanently in this posi-
tion. Replace actuator immediately. If vent damper
is left in open position, boiler will not operate at
published efficiencies.
11a
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