Manuals / Lochinvar / Household Appliance / Boiler

Lochinvar 2.5, 1.5, 3.5 service manual Checking temperature sensors, Troubleshooting

Models: 3.5 2.5 1.5

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Checking temperature sensors

Service Manual

3 Troubleshooting

Checking temperature sensors

The boiler temperature sensors (inlet water, outlet water, system water, flue, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature. If the resistance of the sensor does not closely match its corresponding table, replace the sensor

It is important to note that the flue and outlet inlet air - S11/S13 #1 and S12/S14 #2 water sensors have two temperature sensing devices in one housing. These devices are designated as S1/S9, outlet sensor and S3/S10, flue sensor. Please reference the wiring diagram in the Crest Installation and Operation Manual for correct terminal location.

Table 3B - Inlet Water/System Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

50	18,780	158	1,990
68	12,263	176	1,458
86	8,194	194	1,084
104	5,592	212	817

1223,893

1402,760

Table 3C - Outdoor Air Sensor Resistance vs. Temperature

Temperature	Resistance	Temperature	Resistance
-50	490,813	20	46,218
-40	336,606	30	34,558
-30	234,196	40	26,099
-20	165,180	50	19,900
10	118,018	60	15,311
0	85,362	70	11,883
10	62,465	80	9,299

Table 3D - Outlet Water Sensor Resistance vs. Temperature

	Outlet		S1			R/Y			Outlet		S9		RW/Y
	Pre-Mix Air 1		S11			GY/Y			Pre-Mix Air 1		S13		BR/Y
	Pre-Mix Air 2		S12			BK/Y			Pre-Mix Air 2		S14		T/Y
	Temperature		Resistance		Temperature			Resistance	Temperature		Resistance		Temperature		Resistance
	50	19,553		158			2,004		50	40,030		158		3,478
	68	12,690		176			1,464		68	25,030		176		2,492
	86	8,406		194			1,084		86	16,090		194		1,816
	104	5,715		212			816		104	10,610		212		1,344
	122	3,958							122	7,166
	140	2,786							140	4,943


	Table 3E - Flue Sensor Resistance vs. Temperature

	Flue		S3			GY/Y			Flue		S10		W/Y
	Temperature		Resistance		Temperature			Resistance	Temperature		Resistance		Temperature		Resistance
	50		40,030		158			3,478	50		258,500		158		16,870
	68		25,030		176			2,492	68		125,500		176		12,000
	86		16,090		194			1,816	86		80,220		194		8,674
	104		10,610		212			1,344	104		52,590		212		6,369
	122		7,166						122		35,270
	140		4,943						140		24,160

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Image 38

Lochinvar 2.5, 1.5, 3.5 Checking temperature sensors, Troubleshooting, E - Flue Sensor Resistance vs. Temperature

Contents

Models Contents Hazard definitionsDANGER REMOVAL OF COMBUSTION CHAMBER LINING Please read before proceedingHandling ceramic fiber materials NIOSH stated First AidBoiler water When servicing boilerBoiler operation Freeze protection fluidsMaintenance What is in this manual?Service Troubleshooting1 Service Boiler piping1 Service continued Home ScreenSMART CONTROL MODULE Control inputs1 Service LOW VOLTAGE CONNECTION BOARD Control outputsSMART CONTROL MODULE LINE VOLTAGEAccess modes General Operation1 Service Figure 1-3 Password ScreenTo adjust and save parameters reference FIG Figure 1-4 Setup ScreenFigure 1-5 Initial Setup Screen Table 1A Sequence of Operation Sequence of operation1 Service Parameter table Parameter table 1 ServiceDELAY RAMPSETBACK SETUPParameter table SH NIGHTSETBACK 1 ServiceParameter table HWG NIGHTParameter table PUMPSA Initial Setup Viewable and changeable control parameters1 Service B Set PointsC Outdoor Reset Figure 1-6 Outdoor Air Reset CurveShift OA Reset Curve 1 ServiceD Ramp Delay Boost TemperatureF Advanced Setup E BMS1 Service G/H SH/HWG Night SetbackCascade Offset I ModBusJ Cascade Minimum On/Off Time1 Service K PumpsService Notification Running Hours L Service NotificationService Notification in Months Service Notification Cycles1 Service Cascade Screen Figure 1-8 Cascade ScreenFigure 1-10 Graph Screen Graph ScreenFigure 1-9 Graph Screen Parameter Selection Figure 1-12 Graph Screen Blocking Faults 1 Service History ScreenFigure 1-11 History Screen Lockout Faults History Screen Figure 1-13 History Screen Runtime HistoryService Screen Figure 1-14 Service ScreenOwner maintenance 2 Maintenance Maintenance and annual startupService technician see the following pages for instructionsClean condensate trap 2 MaintenanceAddress reported problems Inspect boiler areaCheck water system 2 Maintenance continuedFlue vent system and air piping Check expansion tankCheck control settings Check ignition ground wiringCheck all boiler wiring Check flame signal2 Maintenance continued Cleaning boiler heat exchangerReview with owner Handling ceramic fiber materialsCheck the following 3 TroubleshootingBefore troubleshooting Check control module fusesCAUSE 3 Troubleshooting continuedFAULT CORRECTIVE ACTIONTable 3E - Flue Sensor Resistance vs. Temperature Checking temperature sensors3 Troubleshooting Table 3F Troubleshooting Chart - Noisy System 3 Troubleshooting continuedFAULT CAUSECORRECTIVE ACTION FAULTDESCRIPTION 3 TroubleshootingDESCRIPTION 3 Troubleshooting continuedFAULT CORRECTIVE ACTIONDESCRIPTION 3 TroubleshootingFAULT CORRECTIVE ACTIONDESCRIPTION 3 Troubleshooting continuedFAULT CORRECTIVE ACTIONDESCRIPTION 3 TroubleshootingFAULT CORRECTIVE ACTIONFAULT Troubleshooting continuedDESCRIPTION CORRECTIVE ACTIONDESCRIPTION 3 TroubleshootingFAULT CORRECTIVE ACTIONDESCRIPTION 3 Troubleshooting continuedFAULT CORRECTIVE ACTIONDESCRIPTION 3 TroubleshootingFAULT CORRECTIVE ACTIONDESCRIPTION 3 Troubleshooting continuedFAULT CORRECTIVE ACTIONDESCRIPTION 3 TroubleshootingFAULT CORRECTIVE ACTIONDESCRIPTION 3 Troubleshooting continuedFAULT CORRECTIVE ACTION3 Troubleshooting Combustion Analysis ProcedurePOSSIBLE CAUSE CORRECTIVE ACTIONFigure 3-2 Gas Valve Adjustment Models 1.5 and Gas valve adjustment procedure3 Troubleshooting continued Figure 3-3 Gas Valve Adjustment ModelPage Page FB-SERRev B 7/11