Carrier 48FP - Page 68

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