VIII Check-out procedure — troubleshooting
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
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.
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.
Open
Closed
Damper blade indicator
Figure 13
Temporary manual opening of vent damper — refer also to vent damper manufacturer’s instructions.
| Wrench or pliers |
Effikal damper | Johnson Controls damper |
26 | Part Number |