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68
Table 55 — Compressor Loading and Unloading Sequences (60 Hz Units)
COOLING
STAGE
SIZE 034 UNITS
Lead Circuit
Lag Circuit
Active
Cyls
Percent
Capacity
Comp
1
Unload
U1
Unloader
U1A
Comp
2
Unloader
U2
Unloader
U2A
0
OFF
OFF
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
OFF
OFF
2
17
2
ON
ON
OFF
OFF
OFF
OFF
4
33
3
ON
OFF
OFF
OFF
OFF
OFF
6
50
4
ON
OFF
OFF
ON
ON
ON
8
67
5
ON
OFF
OFF
ON
ON
OFF
10
83
6
ON
OFF
OFF
ON
OFF
OFF
12
100
COOLING
STAGE
SIZE 038 UNITS
Lead Circuit
Lag Circuit
Active
Cyls
Percent
Capacity
Comp 1
Unloader
U1
Unloader
U1A
Comp 2
Unloader
U2
0
OFF
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
OFF
2
14
2
ON
ON
OFF
OFF
OFF
4
28
3
ON
OFF
OFF
OFF
OFF
6
42
4
ON
OFF
OFF
ON
ON
8
71
5
ON
OFF
OFF
ON
OFF
10
100
COOLING
STAGE
SIZE 044 UNITS
Lead Circuit
Lag Circuit
Active
Cyls
Percent
Capacity
Comp 1
Unloader
U1
Comp 2
Unloader
U2
0
OFF
OFF
OFF
OFF
0
0
1
ON
ON
OFF
OFF
2
25
2
ON
OFF
OFF
OFF
4
50
3
ON
OFF
ON
ON
6
75
4
ON
OFF
ON
OFF
8
100
COOLING
STAGE
SIZE 048 UNITS
Lead Circuit
Lag Circuit
Active
Cyls
Percent
Capacity
Comp 1
Unloader
U1
Unloader
U1A
Comp 2
Unloader
U2
0
OFF
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
OFF
2
19
2
ON
ON
OFF
OFF
OFF
4
38
3
ON
OFF
OFF
OFF
OFF
6
58
4
ON
OFF
OFF
ON
ON
8
79
5
ON
OFF
OFF
ON
OFF
10
100
COOLING
STAGE
SIZE 054 UNITS
Lead Circuit
Lag Circuit
Active
Cyls
Percent
Capacity
Comp 1
Unloader
U1
Unloader
U1A
Comp 2
Unloader
U2
0
OFF
OFF
OFF
OFF
OFF
0
0
1
ON
ON
ON
OFF
OFF
2
20
2
ON
ON
OFF
OFF
OFF
4
40
3
ON
OFF
OFF
OFF
OFF
6
60
4
ON
OFF
OFF
ON
ON
8
80
5
ON
OFF
OFF
ON
OFF
10
100