20
Table 11. Oil Safety Switch
Pressure
Alarm
Copeland
MFGRS.
Model No. Diff. Psi (bar)
Circuit
Part No.
Cut-In
Cut-Out
Sentronic
7 – 9
12 - 14
Yes
085-0062-00
Penn
P45NCA-12
No
Ranco
P30-5826
Yes
Robertshaw
PD21-2502
9 (
±
2)
14
No
085-0088-00
Robertshaw
PD21-1006
Yes
Penn
P45NCB-3
Yes
085-0101-00
Robertshaw
LG21-2501
Yes
All controls are Manual Reset type with a 120 second nominal time delay at the rated voltage.
Compressors
The majority of the Heatcraft Parallel systems incorporate the
Copeland compressor. Other brand compressors are
available upon customer request. The compressors are solid
mounted to a base frame or mounted on the refrigerant
receiver. All reciprocating compressors incorporate oil floats.
Crankcase heaters will be installed and wired. Cylinder head
cooling fans will be installed on all low temperature
reciprocating systems or as directed by the specific
compressor manufacturer. A high pressure cutout and oil
failure control are installed and wired for each compressor.
Many compressors are available with unloading for capacity
control. The unloading of a compressor adds many capacity
steps to those normally available to an electronic controller.
Usually, the more steps available the better the load can be
matched.
Copeland Compressors
Table 8. 3D / 4D / 6D Solid State Modules
Control Voltage
Model
Copeland
Copeland
T.I.
Number
Kit
Number
Number
Number
115 - 230 Volts
3D-FSM
4D / 6D
998-0524-00
071-0524-00
31AA-1600E
Table 9. Typical Voltage Ranges
Voltage
60 Hertz Rating
50 Hertz Rating
Code
Rating
Min.
Max.
Rating
Min.
Max.
B
230-1
207
253
-
-
-
C
208/230-3
187
253
200/220-3
180
240
D
460-3
414
506
380/420-3
342
462
E
575-3
518
633
500-3
450
550
K
208/230/460-3
187
506
200/380/400-3
180
440
M
-
-
-
380/420-3
342
462
N
230/460-3
207
506
200/400-3
180
440
U
200-3
180
220
-
-
-
Refer to voltage rating of specific models.
Table 10. Unloader Factors
Model
Factors
3D
See Copeland Application Bulletin Number AE 21-1278
Moduload - Capacity Control for 3D Compressors
Full Load
One Bank
Two Bank
Unloading
Unloading
Performance
HT
MT
LT
HT
MT
LT
HT
MT
LT
CAPACITY
1.00
1.00
1.00
.50
.50
.50
-
-
-
4D
POWER
1.01
1.03
1.02
.56
.56
.56
-
-
-
AMPS
1.01
1.03
1.02
.60
.60
.74
-
-
-
CAPACITY
1.00
1.00
1.00
.70
.70
.70
.36
.36
.36
6D
POWER
1.01
1.03
1.02
.70
.71
.72
.40
.42
.43
AMPS
1.03
1.04
1.02
.75
.77
.84
.55
.60
.72
Multiply compressor rating data by above factors when used with blocked suction unloading.
Refer to Copeland AE 17-1287 for Demand Cooling Restrictions on unloading.
