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Spring coil
Figure 17: NTC-sensor in top cap and resistance values for compressors ZHI18K1P and ZHI23K1P tandem ready
BOM 477 and ZHI27K1P to ZHI46K1P
In case the NTC top cap sensor shown in Figure 17 has to be replaced please refer to the Spare
parts catalogue available at
parts.
Please follow instructions hereunder:
Figure 18: Replacement of the NTC top cap sensor
NOTE: For more information, please refer to Technical Information C7.8.6 "Discharge Gas
Temperature Protection for Copeland™ Heat Pump compressors".
4.5
Motor protection
4.5.1 Internal line break motor protection
For the ZH04K1P to ZH19K1P and ZHI05K1P to ZHI40K1P range of compressors, conventional
inherent internal line break motor protection is provided.
4.5.2 External protection with Kriwan
The electronic motor protection system used in ZHI46K1P is identified by a "W" as the centre
letter in the motor code. This system utilizes the temperature-dependent resistance of the
thermistors (also called PTC-resistance) to read the winding temperature. A chain of four
thermistors connected in series is embedded in the motor windings so that the temperature of
the thermistors can follow the winding temperature with little inertia. An electronic module is
required to process the resistance values and trip a control depending on the thermistor
resistance.
Kriwan module
For protection in case of blocked rotor one thermistor for each phase is embedded in the winding
heads on the upper (suction gas) side of the compressor motor. A fourth thermistor is located in
C6.2.26/1013-1116/E
Temperature
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Remove the existing thermally conductive compound
from the thermal well.
Dispense
0.75-1
compound into the bottom of the thermal well.
Clean any debris, grease or dirt from the upper cap
surface outside the thermistor tube opening along with the
inside tube surface. If the areas shown are not clean, the
silicone sealant will not adhere to the compressor.
Apply a 5 mm bead of silicone sealant (99-5170-66)
on the thermistor in areas indicated.
After installation, the thermistor must be flushed with
the top cap on, and the seal must be water tight.
Resistance
Temperature
in °C
in KΩ
in °C
-40
2889.60
80
-30
1522.20
90
-20
834.72
100
-10
475.74
110
0
280.82
120
10
171.17
130
20
107.44
140
25
86.00
150
30
69.28
160
40
45.81
170
50
30.99
180
60
21.40
190
70
15.07
-
for the replacement kit with all needed
3
cm
of
thermally
Resistance
in KΩ
10.79
7.87
5.85
4.45
3.35
2.58
2.02
1.59
1.25
1.01
0.83
0.68
-
conductive
19
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