Thetford NR740 Manual do Utilizador descarregar pdf (Página 7)

Refrigerator Service Manual

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure E

Verifying Thermistor Operation

To measure the resistance of the evaporator thermistor, com-

plete the following procedure.

Turn the temperature control to the "Off" position.1.

Disconnect the 3-pole connector. Refer to Figure 7.2.

Measure the resistance across the two pins. Refer to 3.

Figure 8.

Check the evaporator thermistor by measuring the tem-4.

perature and resistance of the thermistor.

Refer to Table 1 for a listing of acceptable resistance

ranges.

NOTE: In general, 1.6K - 29KΩ = good thermistor.

∞Ω = defective thermistor. An open thermistor

will stop normal compressor operation. Replace

the defective thermistor.

Evaporator Thermistor Resistance

Thermistor Temperature

(°F) (°C)

Resistance Allowable

Resistance

Range

0 -18 9.7 KΩ 8.7 - 10.7 KΩ

10 -12 7.8 KΩ 7.0 - 8.6 KΩ

20 -7 6.4 KΩ 5.7 - 7.0 KΩ

30 -1 5.3 KΩ 4.8 - 5.7 KΩ

40 4 4.5 KΩ 4.0 - 4.9 KΩ

50 10 3.6 KΩ 3.2 - 4.0 KΩ

60 16 2.8 KΩ 2.5 - 3.1 KΩ

70 21 2.1 KΩ 1.9 - 2.3 KΩ

80 27 1.9 KΩ 1.7 - 2.0 KΩ

90 32 1.8 KΩ 1.6 - 1.9 KΩ

Table 1. Evaporator Thermistor Resistance

ART01955

Figure 8. Measure Resistance Across Pins

ART01954

Figure 7. Evaporator Thermistor Connection

(Inside Power Supply)

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