Boiler Manual - Weil-McLain

More documents

Recommendations

Info

GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)CHART 6TSTAT CIRC light flashing and POWER light on steadyElectrical shock hazard — Wherever you see TURN OFF POWER, follow the instructions. Failure to followinstructions could result in severe personal injury, death or substantial property damage.• This is NOT a lockout mode.• The IBC is signaling that the return water temperature sensoris detecting a temperature less than 40 °F.• While the temperature at the boiler return water temperaturesensor is less than 40 °F, both of the internal boiler circulatorswill run continuously, even if there is no call for heat(though the boiler will not fire until the thermostat calls forheat). This operation is intended to reduce chances of freezingduring system down times by keeping water flowing.• Attach sensor to pipe with clampprovided.• If problem persists, replace returnwater temperature sensor.• Retest.Is return water temperature sensor clampedsecurely to the return pipe in the boiler?NoYesAre both boiler internal circulators operating?• Remove CIRCULATORS plug (Figure 93, page 78, Item 4)from plug receptacle of IBC.• Place voltmeter leads across the 120 VAC Nand120 VAC H pins of the CIRCULATORS receptacle onthe side corresponding to the circulator not operating.Does the voltmeter indicate 120 VAC?NoYesNoYesIs there a call for heat?• Verify by removing thermostat wirings at boiler and checkingcontinuity across external wires.NoYes• Replace the IBC (IBC).• Retest.• Replace circulator harness.• Retest.• Test wire continuity ofcirculator wire harness.Is harness ok?NoYes• This is normal operation forwater less than 40 °F at boilerinternal return pipe.• Condition should change aftera call for heat, when the boilerwill heat up the water.• Wait 10 minutes to allowheat from the boiler toraise the water temperature.Does LIMIT light quit flashing(and pipes begin to heat up)?NoYes• Reconnect circulator harness to the IBC.• Attempt to get the circulator started by giving it a sharp rap on theend of the circulator motor (to release a possibly locked impeller).• If the circulator begins to operate, allow it to operate for a fewminutes to see if the problem clears.• If problem persists, replace the bypass circulator.• Retest.• Boiler is not heating.• Troubleshoot boiler usingCHART 8, page 88.• Boiler should now operate normally.• Verify correct sequence of operation (Figure 75, page 65).86Part number 550-142-054/1211
GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)CHART 7LIMIT light flashing and POWER light on steadyElectrical shock hazard — Wherever you see TURN OFF POWER, follow the instructions. Failure to followinstructions could result in severe personal injury, death or substantial property damage.• This is NOT a lockout mode. The IBC should only be signalingthat the water temperature sensor is either shorted orthere is an open circuit across the sensor terminals.• This situation is usually corrected by replacing the sensor,as described below.• Remove SENSOR plug from receptacle on IBC (Figure 93, page 78, Item 6).• Then re-insert.Does LIMIT light still flash?NoYes• Replace sensor and harness.Does LIMIT light still flash?NoYes• Boiler may now be operating correctly. Verify per normalsequence of operation (Figure 75, page 65).• Replace IBC (IBC).• Retest.Part number 550-142-054/1211 87
Page 1 and 2:
®Gas-Fired Water BoilersBoiler Man
Page 3 and 4:
GV90+ gas-fired water boiler — Bo
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31:
Page 34:
Page 37 and 38: GV90+ gas-fired water boiler — Bo
Page 85: GV90+ gas-fired water boiler — Bo
show all

Boiler Manual - Weil-McLain

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?