Specifications

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• The valve start command is delayed by a valve delay counter; a delay of 60 seconds is
used.
• The equipment integrator must select the proper expansion module option and valve end
switch for the unit configuration.
• The condenser water valve is opened by starting the compressor.
Heating & Cooling Operation
The controller will measure the zone temperature and stage the compressor(s) to maintain its
set-point. To prevent short-cycling, there will be a 5 minute delay between compressor stages (if
equipped with 2 compressors). Additionally, there will be a 1 minute delay when transitioning
between heat and cool modes. The compressor will run subject to internal safeties and controls
provided by UPM board.
Heating
Heating will be enabled whenever:
• The fan output is on
• The loop valve is open
• The reversing valve is de-energized in heat mode.
Cooling
Cooling will be enabled whenever:
• The fan output is on.
• The loop valve is open
• AND the reversing valve is energized in cool mode.
HGRH Start/Stop (On/Off)
Once the set-point has been satisfied and the humidity is above set-point, the unit will run until
there is another cooling call, or the humidity set-point has been satisfied. Active humidity
removal will operate the equipment until satisfied.