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Table 19 — Compressor Loading and Unloading Sequences (cont)
COOLING
STAGE
SIZE 054 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 20
2 ON ON OFF OFF 4 40
3 ON OFF OFF OFF 6 60
4 ON ON OFF ON 10 80
5 ON OFF OFF ON 12 100
COOLING
STAGE
SIZE 064 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 074, 078 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 29
3 ON OFF OFF OFF 6 43
4 ON ON ON ON 8 71
5 ON ON OFF ON 10 86
6 ON OFF OFF ON 12 100
COOLING
STAGE
SIZE 088 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 16
2 ON ON OFF OFF 4 33
3 ON OFF OFF OFF 6 50
4 ON ON ON ON 8 66
5 ON ON OFF ON 10 83
6 ON OFF OFF ON 12 100
COOLING
STAGE
SIZE 104 UNITS
Lead Circuit Lag Circuit
Active
Cylinders
Percent
Capacity
Comp 1 Unloader U1 Comp 3 Comp 2 Comp 4
0 OFF OFF OFF OFF OFF 0 0
1 ON ON OFF OFF OFF 4 20
2 ON OFF OFF OFF OFF 6 30
3 ON ON OFF ON OFF 10 50
4 ON OFF OFF ON OFF 12 60
5 ON ON OFF ON ON 14 70
6 ON OFF OFF ON ON 16 80
7 ON ON ON ON ON 18 90
8 ON OFF ON ON ON 20 100
43