Standing Pilot Boilers — Control Supplement
Troubleshooting
Burner access panel must be in posi- tion during boiler operation to prevent momentary flame rollout on ignition of main flame. Severe personal injury or substantial property damage will result.
Never jumper (bypass) any device ex- cept for momentary testing as outlined in Troubleshooting Charts. Substantial property damage and/or severe personal injury could occur.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous opera- tion.
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.
Before troubleshooting
1.Have a voltmeter that can check 120 VAC, 24 VAC, and a continuity tester.
2.Check for 120 VAC (minimum 102 to maximum 132) to boiler.
3.Be sure pilot is lit. See “Lighting instructions” on pages
4.Make sure thermostat is calling for heat and contacts (including appropriate zone controls) are closed. Check for 24VAC between thermostat wire nuts and ground.
Part Number
In event of vent damper failure:
Effikal vent 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.
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 actua- tor. Boiler will fire. Verify that damper service switch is in Hold Damper Open position (Figure 9).
3.Do not leave vent damper permanently in this position. Replace actua- tor immediately. If vent damper is left in open position, boiler will not operate at published efficiencies.
Johnson Controls vent 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 9.
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, manually rotate damper blade until green light turns on. Boiler will fire (Figure 9).
5.Do not leave vent damper permanently in this position. Replace actua- tor immediately. If vent damper is left in open position, boiler will not operate at published efficiencies.
Figure 9 Manually opening vent damper
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