Boiler Manual - Weil-McLain

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GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)CHART 8Insufficient heat or no heat to system (POWER light on steady)Electrical 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.• Has it been at least 5 minutes since setting thermostat tocall for heat? If not, wait 5 minutes. Is system heating?• Is thermostat set to call for heat? Remove thermostatwires at boiler and check continuity across the two wires. Ifcircuit isn't closed, check external thermostat (zone valve,relay, etc.) wiring. Correct problems and retry.• Reconnect external thermostat wiring at boiler.Is thermostat circuit closed (continuity across wires)?NoAre all red lights off?NoYes• Wait 30 seconds.Are all red lightsoff?No• Replace IBC.• Retest.Yes• Wait for cast ironblock to cool to roomtemperature.Are block switchcontacts closed?Yes• Boiler is in standby.• Set thermostat to call for heatand recheck operation.• Verify sequence of operation,Figure 75, page 65.• Check block switch on top ofboiler with continuity checker.Are contacts closed?• Check across limitswitch contacts withcontinuity checker.Are contacts closed?YesNo Yes • Check across thermal fuseleads with continuity checker.Is circuit closed?• Replaceswitch.NoYes• Retest.• Replacethermal fuse.• Retest.No• Replace IBC.• Retest.• Excessive block temperature has been reduced to safe operatinglevel. Check for low water level or mineral depositsin sections. Correct before proceeding.• Restart boiler and check sequence of operation (Figure75, page 65).NoYesIs boiler System circulator operating?No• Replace IBC.• Retest.• Wait 5 minutes.NoIs FLAME light on?Yes• Remove system circulator harness plug from CIR-CULATORS plug receptacle (long harness) (seeFigure 93, page 78, Item 4). Check with voltmeteracross left-side 120 VAC N and 120 VAC H pins ofreceptacle.Does voltmeter show 120 VAC across pins?NoYes• If you have sufficient heat — boiler should follow normaloperating sequence (Figure 75, page 65).• If you have less than sufficient heat —Is vent or combustion air piping free of blockage?No• Correct conditions andrecheck operation. Seesequence of operation, Figure75, page 65.Yes• Wait for boiler water to cool to temperature 20 to 30 °Flower than temperature set on limit switch.Are limit switch contacts closed?No• Replace limit switch.• Retest.Yes• Repair/replace circulator.Retest.• Repair/replace wiring.Retest.• Contact your Weil-McLain sales representative.Yes• Boiler water temperature exceeded setting on limit switchwith thermostat calling for heat. Boiler is OK. (See sequenceof operation, Figure 75, page 65)• Also check operation of setting on limit switch (should beabove 140°F.).88Part number 550-142-054/1211
GV90+ gas-fired water boiler — Boiler ManualReplacement partsFigure 96 Miscellaneous partsDescription Model Weil-McLainpart numberVent Termination Kit for 3" PVC All 383-500-397Vent Termination Kit for 3" Stainless Steel All 382-200-430Vent Termination Bird Screen 3" PVC (1 pc) All 383-500-1053" PVC Concentric Vent Kit All 383-500-350Adapter 3-inch AL29-4C Vent Starter, FasNSeal All 560-907-717Adapter 3-inch AL29-4C Vent Starter, Z-Vent All 560-907-723Adapter 3-inch AL29-4C Vent Starter, Saf-T-Vent All 560-907-724Adapter 3-inch AL29-4C Vent Starter, CORR/GUARD All Contact Weil-McLainChemicals:Antifreeze, aluminum-safe, Sentinel X500 . . . . . . . . . . . . . . . . . . . . . . .Corrosion inhibitor, Sentinel X100 . . . . . . . . . . . . . . . . . . . . . . . . . .(one tube is shipped with boiler)Sentinel X100 Inhibitor Test Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . .(one kit is shipped with boiler)Cleaner, Sentinel X400. . . . . . . . . . . . . . . . . . . . . . . . . . . .All592-900-004592-900-002592-900-005592-900-003Condensate neutralizer kit All 383-500-631Oil Lubricant 3 Oz Andersol 465 All 592-900-015Part number 550-142-054/1211 89
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Boiler Manual - Weil-McLain

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