Weil-McLain GOLD DV WATER BOILER, 550-141-850/0599 manual XIc Troubleshooting air pressure switch

Page 68

GOLD GV Water boiler series 3 — manual

XIc Troubleshooting — air pressure switch

Checking the air pressure switch

Do not use manometer as shown in Figure 33 to test gas valve outlet pressure. Where instructed in this manual to check gas valve outlet pressure, follow instructions carefully, particularly regarding connection of manometer. Manometer fluid will cause permanent damage to gas valve. Severe personal injury, death or substantial property damage can result.

	Check switch pressure setting		Figure 33 Connecting a manometer to
	1.	See Figure 33.	check air pressure switch. DO
	1.	See Figure 33.	NOT use this arrangement to
			NOT use this arrangement to
	2.	Remove both air pressure switch hoses from air	check gas valve.

pressure switch.

3.Install tees and tubing as shown in Figure 33 to inclined manometer.

4.	Turn off gas valve and set thermostat to call for heat.	Suction	Pressure
	Blower will run but burner will not ignite.
5.	Check for 24 VAC between both air pressure switch
	terminals and ground.
6.	If manometer reading is at least 1.4" w.c., but there is	Inclined tube
	not 24 VAC between both air pressure switch	manometer
	terminals and ground, replace air pressure switch.

Troubleshooting air pressure reading

1.If manometer reading is lower than 1.4" w.c. check for possible causes:

•blockage in hoses.

•loose blower wheel on motor shaft.

•blower motor not at proper rpm.

•blockage in air inlet or hose.

•blockage in flue pipe or termination.

•condensate trap filled w/condensate.

Return to normal operation

1.When pressure reading is proper and air pressure switch is operating properly, remove tees and reinstall hoses to air pressure switch.

Red

White

Shown with Robertshaw 7200DERN gas control

85027

68	Part number 550-141-850/0699

Image 68

Contents Gold GV How it works Gold GV Water boiler Series Hazard definitions Installer User Please read before proceedingBoiler water When servicing boilerBoiler operation Contents Contents Ia Prepare boiler location overview Overview of this sectionInstallations must follow these codes Ib Prepare boiler location codes & altitudeIc Prepare boiler location clearances Clearance optionsLarge space Small spaceResidential garage installation PrecautionsFlooring and foundation FlooringGV special vent system Id Prepare boiler location vent systemRemoving from existing vent Ie Prepare boiler location contamination Air contaminationIf Prepare boiler location air openings Special considerations GV in small space less than aloneIIa Prepare boiler overview IIb Prepare boiler vent starter tee & drainScrew hole Base rail Insert Cpvc elbow Plate installation IIc Prepare boiler orifice plateNatural gas PropaneBottom side of boiler front section When required IId Prepare boiler high altitude kitAltitudes above 5,500 feet only White Hose RedIIe Prepare boiler place in position Rotate IIf Prepare boiler pressure test Perform hydrostatic pressure testPrepare boiler for test Fig Fill and pressure testPiping connections for hydrostatic test IIIa Water piping overview For heating system with See pages 27 30Install relief valve IIIb Water piping relief valveIIIc Water piping boiler connections Supply & return connectionsAir separator Expansion tankPiping closed IIId Water piping all systems Zoning with circulatorsIIIe Water piping baseboard system Baseboard system pipingIIIf Water piping radiator system Radiator system pipingIIIg Water piping single-zone radiant or heat pump system Multi-zone radiant heating system piping Outdoor reset controlIIIh Water piping multi-zone radiant system IIIi Water piping snow melt system Manual bypass valves for fixed temp operation onlyIIIj Water piping water chiller systems Water chiller systemsIV Venting and combustion air Propane Gas Connecting gas supply piping to boilerGas piping Feet VI Field wiring Electrical installation must comply withWiring connections ThermostatsField wiring Factory wiring Freeze protection when used VIIa Start-up overviewVIIb Start-up preparation Verify water chemistryVIIb Start-up preparation Verify gas/air orifice plateCheck for gas leaks Fill the system with waterVIIc Start-up read Section VIId Start-up to operate boilerPerform final checks before starting boiler Start the boilerVIId Start-up operate boiler VIIe Start-up if boiler doesn’t startCheck Gas Control Set Point Connect and adjust manometerVIIf Start-up altitude over 5,500 feet only At Least Inches VIIIa Check-out procedure overview Check-out procedure checklistVIIIb Check-out procedure checklist Shows the ladder wiring diagram for the GV series 3 boiler IXa Operation overviewIXb Operation sequence StepsIXb Operation wiring diagrams Ladder diagram legendGCM For Your Safety Read Before Operating IXc Operation lighting instructionsWhite-Rodgers gas valve model 36E Xa Service and maintenance overview Xb Service and maintenance schedule Service technicianXc Service & maintenance annual start-up Annual start-up only by qualified service technicianStart-up Xc Service & maint. annual start-upcont Annual start-up check/testIgniter Expansion tankGauges Review with owner Annual start-up owner reviewBoiler relief valve Condensate drain line Check valve assembly To remove the blower assembly Igniter XIa Troubleshooting overview Check the following XIb Troubleshooting proceduresBefore troubleshooting XIc Troubleshooting air pressure switch Checking the air pressure switchXId Troubleshooting servicing tips Blower HousingIgniter Gas ValveXIe Troubleshooting control module Control ModulePower XIf Troubleshooting common problems Symptom Common Causes Possible CorrectionsSymptom Common Causes Possible Corrections XIg Troubleshooting GCM lights Chart 1 Troubleshooting Power light statusChart 2 Tstat Circ & Power lights flashing Chart 3 Limit & Power lights flashing Chart 4 Pres Switch & Power lights flashing Chart 5 Flame & Power lights flashing Chart 6 Tstat Circ light flashing and Power light on steady Chart 7 Limit light flashing and Power light on steady Is thermostat circuit closed continuity across wires? XIIa Replacement parts overview XIIb Replacement parts accessory bag Water trim bag assembly #1XIIc Replacement parts section assembly Description Model Weil-McLain Number Part number85041 XIId Replacement parts jacket assembly 422-200-22885042 XIIe Replacement parts Blower assembly 382-200-340Vent starter tee not included XIIf Replacement parts trim assembly Description Weil-McLain Number Part number85048 XIIg Replacement parts interior panel Interior panel Xiii Dimensions and ratings NumberDOE Gold GV Water boiler Series