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Table 19 — Compressor Loading and Unloading Sequences
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
5
ON
6
ON
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
5
ON
6
ON
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
5
ON
6
ON
Lead Circuit
Unloader
Unloader
U1
U2
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
Unloader
U1
U2
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
OFF
ON
OFF
Lead Circuit
Unloader
Unloader
U1
U2
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
42
SIZE 034 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
SIZE 038 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
SIZE 044 UNITS
Lag Circuit
Cylinders
Comp 2
OFF
OFF
OFF
ON
ON
SIZE 048 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
Active
Percent
Cylinders
Capacity
0
0
2
17
4
33
6
50
8
67
10
83
12
100
Active
Percent
Cylinders
Capacity
0
0
2
14
4
28
6
42
6
72
8
86
10
100
Active
Percent
Capacity
0
0
2
25
4
50
6
75
8
100
Active
Percent
Cylinders
Capacity
0
0
2
19
4
38
6
58
6
62
8
81
10
100
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