Copper-fin II/IIE Boiler, Water Heater and Pool Service Manual

3 Troubleshooting (continued)

Checking temperature sensors

The appliance temperature sensors (inlet water, outlet water, system water, tank 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/Tank Sensor Resistance vs. Temperature

 

S1a

 

 

 

S1b

 

 

(Wire Color - W and Y)

 

 

 

(Wire Color - W/Y and 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 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

 

 

 

 

33

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Lochinvar 502 - 2072, 402 - 2072 service manual Checking temperature sensors, Resistance Temperature, Temperature Resistance

502 - 2072, 402 - 2072 specifications

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