Carrier PC 111 - Page 43

43
Table 20 — Compressor Loading and Unloading Sequences (cont)
COOLING
STAGE
SIZE 044 UNITS
Lead Circuit Lag Circuit
Active
Cylinders
Percent
Capacity
Comp 1
Unloader
U1
Comp 2
0
OFF OFF OFF 0 0
1
ON ON OFF 2 25
2
ON OFF OFF 4 50
3
ON ON ON 6 75
4
ON OFF ON 8 100
COOLING
STAGE
SIZE 048 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 19
2
ON ON OFF OFF 4 38
3
ON OFF OFF OFF 6 58
4
ON ON ON ON 6 62
5
ON ON OFF ON 8 81
6
ON OFF OFF ON 10 100
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