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EGH-105 to EGH-125 EGH-105 to EGH-125
EGH-105 to EGH-125 EGH-105 to EGH-125
EGH-105 to EGH-125 Control Supplement
Part Number 550-110-677/0299
26
Check-out procedure — troubleshooting
VIII
Verify proper operation after servicing
Never jumper (bypass) any device except for momentary
testing as outlined in Troubleshooting Charts. Substantial
property damage and/or severe personal injury could
occur.
Burner access panel must be in position during boiler
operation to prevent momentary flame rollout on
ignition of main flame. Severe personal injury or
substantial property damage will result.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
Before troubleshooting:
a. Have a voltmeter that can check 120VAC, 24VAC, a microammeter
with minimum scale range of 0–25, and continuity tester.
b. Check for 120VAC (minimum 102 – maximum 132) to boiler.
c. Check for 24VAC at secondary side of transformer.
d. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Check for 24VAC between
thermostat wire nuts and ground.
In event of actuator failure:
Effikal damper:
If troubleshooting chart recommends replacing actuator 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. See Figure 13.
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.
677-14
Effikal damper
Johnson Controls damper
Closed
Open
Damper blade
indicator
Wrench or pliers
Figure 13
Temporary manual opening of vent damper —
refer also to vent damper manufacturer’s
instructions.
2. If Step 1 does not open damper, manually rotate
damper blade to open position using wrench or
pliers on flat shaft between damper and actuator
(Figure 13). Boiler will fire.
Verify that damper service switch is in "HOLD
DAMPER OPEN
" position.
3. Do not leave damper permanently in this position.
Replace actuator immediately. If damper is left in
open position, boiler will not operate at published
efficiencies.
See damper manufacturer's instructions packed
with damper for additional information.
Johnson damper:
If troubleshooting chart recommends replacing
actuator 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 13.
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 damper manufacturer’s instructions for
procedure to fix damper in open position.
3. Turn on power to boiler.
4. Using wrench or pliers on flat shaft section,
manually rotate damper blade until green light
turns on. Boiler will fire.
5. Do not leave damper permanently in this position.
Replace actuator immediately. If damper is left in
open position, boiler will not operate at published
efficiencies.
See damper manufacturer's instructions packed
with damper for additional information.