Carrier 50FK User Manual
Page 43
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