September 2020
17
Quest IQ Compressor Wall OMM
Compressors
Whenever the compressor operates, the evaporator is always dehumidifying and cooling the return air. The heat
removed from the air at the evaporator, as well as the heat from the compressor's action, must be rejected to one
of three heat sinks: grow room (premise) air or outdoors. The control system will direct the heat to where it is
needed based on grow room air temperatures:
•
If room air is needed to be warmed up
–
more heat is diverted towards reheat coil;
•
Rest of the heat (if any) is diverted towards outdoors (dry cooler)
Compressor Circuit Operation
Piping schematic for compressor circuit is shown on Pic. E.2.
•
Schematic shows single compressor module (additional compressor modules schematic is the same) and
common to all compressor modules’ glycol cooling circuit.
•
Compressor operation below applies to all modules; compressors are staged
–
if first compressor’s capacity is
not enough to satisfy the call, second compressor will be engaged after certain time delay.
When a demand requires the compressor to operate, the following sequence occurs:
•
Once blower operation, related safeties and timers are confirmed by the control system, following occurs:
o
Compressor glycol pump starts, establishing cooling glycol/water flow through the compressor fluid
circuit - plate heat exchanger(s) and fluid cooling coils (reheat and/or dry cooler or external cooling
source).
o
Pump down solenoid valve opens and once pressure stabilizes, the compressor starts.
Pic. E.2