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Table 20 — Compressor Loading and Unloading Sequences (cont)
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
ON
3
4
ON
5
ON
6
ON
COOLING
STAGE
Comp 1
0
OFF
1
ON
2
ON
3
ON
4
ON
5
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
5
ON
6
ON
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
Lead Circuit
Unloader
Unloader
U1
U2
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
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
Unloader
U1
U2
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
43
SIZE 044 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
ON
ON
SIZE 048 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
SIZE 054 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
SIZE 064 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
SIZE 074, 078 UNITS
Lag Circuit
Comp 2
OFF
OFF
OFF
OFF
ON
ON
ON
Active
Percent
Cylinders
Capacity
0
0
2
25
4
50
6
75
8
100
Active
Percent
Cylinders
Capacity
0
2
19
4
38
6
58
6
62
8
81
10
100
Active
Percent
Cylinders
Capacity
0
2
20
4
40
6
60
10
80
12
100
Active
Percent
Cylinders
Capacity
0
2
17
4
33
6
50
8
67
10
83
12
100
Active
Percent
Cylinders
Capacity
0
2
14
4
29
6
43
8
71
10
86
12
100
0
0
0
0
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