Lochinvar 1 service manual Checking temperature sensors, Temperature Resistance

Page 45

Service Manual

3 Troubleshooting (continued)

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.

Table 3B - Inlet/Outlet 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

 

 

 

 

 

 

 

 

 

 

 

122

 

3,893

 

 

--

--

 

 

 

 

 

 

 

 

 

 

 

140

 

2,760

 

 

--

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3C - Flue Temperature Sensor Resistance vs. Temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature

 

 

Resistance

 

 

Temperature

 

Resistance

 

 

 

 

 

 

 

 

 

 

 

68

 

14,773

 

 

176

1,707

 

 

 

 

 

 

 

 

 

 

 

86

 

9,804

 

 

194

1,266

 

 

 

 

 

 

 

 

 

 

 

104

 

6,652

 

 

212

952

 

 

 

 

 

 

 

 

 

 

 

122

 

4,607

 

 

230

726

 

 

 

 

 

 

 

 

 

 

 

140

 

3,252

 

 

248

560

 

 

 

 

 

 

 

 

 

 

 

158

 

2,337

 

 

--

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3D - 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

 

 

 

 

 

 

 

 

 

 

45

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Contents
Models 1.0, 1.3, Contents Niosh stated First Aid Handling ceramic fiber materialsService MaintenanceTroubleshooting Near boiler piping ServiceSync display Board Control inputsControl outputs Secondary Smart Touch Control Module PrimaryHow the boiler operates General OperationHow the control module operates Sequence of operationSequence of operation space heating and HW Sequence of operationParameter table This table lists the parameters and where to access themOutdoor Reset Status Screen Viewable and changeable control parametersService Details Screen Service Main Screen Setup Screen Service/Setup Parameters Screen Service Set Point Parameters Screen Outdoor Reset Parameters Screen Service Night Setback Parameters Screen Cascade Operation Cascade Parameters ScreenPumps Parameters Screen 10Vdc Operation 10Vdc BMS Parameters ScreenService Cascade Screen Service Temps Screen Burners Screen Graph Select Screen History Screen Service Mode Screen Maintenance Maintenance and annual startup Clean condensate trap Address reported problemsInspect boiler area Inspect boiler interiorFlue vent system and air piping Check water systemCheck expansion tank Check boiler relief valve Check all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner Test low water flow conditions Test procedureAlarm Screen TroubleshootingBefore troubleshooting Check the followingCheck control module fuses No Burner No DisplayOperation Unit DoesTemperature Resistance Checking temperature sensorsNo Pump NoisyOperation Boiler Pump System PumpCondensate Flow SwitchDrain Blocked Flame outLight cont’d Flame LostWhile Running Troubleshooting High Limit / HEX Automatic ResetTemp SW Blower RPM’sToo High Louver Proving SwitchSensor Open Sensor ShortedAir Flow Too Resets Try LaterLow Flap ValveNo Error Stored Internal FaultWriting to MemosGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureGas valve adjustment procedure ModelModels 1.3
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