Carrier 50YDV Installation, Operation And Maintenance Instructions page 31

CXM Control Start-up Operation
The control will not operate until all inputs and safety controls
are checked for normal conditions. The compressor will
have a 5 minute anti-short cycle delay at power-up. The fi rst
time after power-up that there is a call for compressor, the
compressor will follow a 5 to 80 second random start delay.
After the random start delay and anti-short cycle delay,
the compressor relay will be energized. On all subsequent
compressor calls, the random start delay is omitted.
Table 6b: Unit Operation
T-stat signal
G
G, Y or Y1
G, Y1, Y2
G, Y1, Y2, W
G, W
G, Y or Y1, O
G, Y1, Y2, O
1 Stage 1 = 1st stage compressor, 1st stage fan operation
Stage 2 = 2nd stage compressor, 2nd stage fan operation
Stage 3 = 2nd stage compressor, auxiliary electric heat, 2nd
or 3rd stage fan operation (depending on fan settings)
2 Stage 1 = 1st stage compressor, 1st stage fan operation, reversing valve
Stage 2 = 2nd stage compressor, 2nd stage fan operation, reversing valve
3 Stage 1 = compressor, 1st stage fan operation
Stage 2 = compressor, 2nd stage fan operation
Stage 3 = compressor, auxiliary electric heat, 2nd or 3rd stage fan operation (depending on fan settings)
4 Stage 1 = compressor, 1st stage fan operation, reversing valve
Stage 2 = compressor, 2nd stage fan operation, reversing valve
5 Stage 1 = compressor, fan
Stage 2 = compressor, auxiliary electric heat, fan
6 Cooling = compressor, fan, reversing valve
R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n
GT-PX
ECM fan
Fan only
1
Stage 1 heating
1
Stage 2 heating
1
Stage 3 heating
Emergency heat
2
Stage 1 cooling
2
Stage 2 cooling
Safety Features – CXM Control
GT-PG/GT-G
ECM fan
Fan only
3
Stage 1 heating
3
Stage 2 heating
3
Stage 3 heating
Emergency heat
4
Stage 1 cooling
4
Stage 2 cooling
®
R e v. : 4 J a n . , 2 0 1 2
CXM Controls
GT-PG/GT-G
PSC fan
Fan only
5
Stage 1 heating
5
Stage 2 heating
N/A
Emergency heat
6
Cooling
N/A
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