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Compressors ZRD61KRE to ZRD92KRE: These compressors are equipped with a discharge
temperature sensor (NTC thermistor) embedded in the top cap of the compressor. The output of
the NTC thermistor is used in the protection module of the digital Scroll controller. The resistance
curve for the NTC thermistor is provided in Table 6 hereunder.
Temperature
Resistance
(°C)
(kOhm)
-40
2889.60
-35
2087.22
-30
1522.20
-25
1121.44
-20
834.72
-15
627.28
-10
475.74
-5
363.99
0
280.82
5
218.41
10
171.17
15
135.14
20
107.44
25
30
35
40
45
50
55
60
65
70
Table 6: Digital Scroll thermistor temperature / resistance values
4.5
High potential testing
WARNING
Conductor cables! Electrical shock! Shut off power supply before high-
potential testing.
CAUTION
Internal arcing! Motor destruction! Do not carry out high-voltage or
insulation tests if the compressor housing is under vacuum.
Emerson subjects all scroll compressors to a high-voltage test after final assembly. Each motor
phase winding is tested, according to EN 0530 or VDE 0530 part 1, at a differential voltage of
1000V plus twice the nominal voltage. Since high-voltage tests lead to premature ageing of the
winding insulation further additional tests of that nature are not recommended.
If it has to be done for any reason, a lower voltage must be used. Disconnect all electronic devices,
eg, motor protection module, fan speed control, etc prior to testing.
C6.2.44/0219/E
Temperature
(°C)
75
80
85
90
95
100
105
110
115
120
125
130
135
86.00
140
69.28
145
56.16
150
45.81
155
37.58
160
30.99
165
25.68
170
21.40
175
17.91
180
15.07
Resistance
(kOhm)
12.73
10.79
9.20
7.87
6.77
5.85
5.09
4.45
3.87
3.35
2.92
2.58
2.28
2.02
1.80
1.59
1.39
1.25
1.12
1.01
0.92
0.83
19
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