Lochinvar Power-fin 1701 - Manual (Page 33)

3
Troubleshooting
(continued)
Service Manual
33
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
Temperature Resistance Temperature Resistance
68 125,500 158 16,870
77 100,000 176 12,000
86 80,220 194 8,674
104 52,590 212 6,369
122 35,270 230 4,744
140 24,160 248 3,581
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
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
Table 3C Flue Temperature Sensor Resistance vs. Temperature
Table 3D Outdoor Air Sensor Resistance vs. Temperature