Carrier PC 111 User Manual
Page 42
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42
Table 20 — Compressor Loading and Unloading Sequences
COOLING
STAGE
SIZE 034 UNITS
Lead Circuit
Lag Circuit
Active
Cylinders
Percent
Capacity
Comp 1
Unloader
U1
Unloader
U2
Comp 2
0
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
2
17
2
ON
ON
OFF
OFF
4
33
3
ON
OFF
OFF
OFF
6
50
4
ON
ON
ON
ON
8
67
5
ON
ON
OFF
ON
10
83
6
ON
OFF
OFF
ON
12
100
COOLING
STAGE
SIZE 038 UNITS
Lead Circuit
Lag Circuit
Active
Cylinders
Percent
Capacity
Comp 1
Unloader
U1
Unloader
U2
Comp 2
0
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
2
14
2
ON
ON
OFF
OFF
4
28
3
ON
OFF
OFF
OFF
6
42
4
ON
ON
ON
ON
6
72
5
ON
ON
OFF
ON
8
86
6
ON
OFF
OFF
ON
10
100
ACCESS DOOR
PE VFD
EXHAUST
AIR
LARGE ECONOMIZER
HOOD LOCATION
AUXILIARY
CONTROL BOX
POWER EXHAUST
ACCESS DOOR
SMALL ECONOMIZER
HOOD LOCATION
Fig. 48 — Modulating Power Exhaust Return End Sheet Metal Skin Detail; 48FM and 50FM,FS Units
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