Comfort-Aire HTH Series - Manual (Page 29)

29
Installation, Operation & Maintenance HTV/HTD/HTH SERIES Heat Controller, Inc.
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.
CXM Controls
T-stat signal
TT TS TS
ECM fan ECM fan PSC fan
G Fan only Fan only Fan only
G, Y or Y1 Stage 1 heating 1 Stage 1 heating 3 Stage 1 heating 5
G, Y1, Y2 Stage 2 heating 1 Stage 2 heating 3 Stage 2 heating 5
G, Y1, Y2, W Stage 3 heating
1
Stage 3 heating
3
N/A
G, W Emergency heat Emergency heat Emergency heat
G, Y or Y1, O Stage 1 cooling 2 Stage 1 cooling 4 Cooling 6
G, Y1, Y2, O Stage 2 cooling 2 Stage 2 cooling 4 N/A
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
HT
Table 6b: Unit Operation