Dectron DS Series – Outdoor OMM 24 September 2020
Piping schematic for compressor circuit is shown on Pic. E.1-L.
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, the pump down
solenoid valve opens and once pressure stabilizes, the compressor starts.
- Reheat valve diverts portion of hot gas into the reheat coil. Remainder of the hot gas goes into outdoor
condenser and (if applicable) pool water heat exchanger.
o Dehumidifier with pool heating option: pool valve diverts portion of hot gas into pool water heat
exchanger, based on pool water heating demand.
o Outdoor condenser fan is engaged only if hot gas is diverted outdoors and compressor pressure is
higher than pre-set level (see Outdoor Condenser and Fluid Cooler Operation below).
- Once demand for the compressor’s operation is removed (respective call is satisfied), the pump down solenoid
valve closes; once the compressor suction pressure reaches the pre-set pressure, the compressor stops.
Outdoor Condenser and Fluid Cooler Operation.
Based on the type of the outdoor condenser or fluid cooler fans’ type (two-speed fans or EC-type/modulating
fans), respective signal(s) are sent by control system to engage said fan(s): for two-speed fans - on/off signals
(switching speeds, based on compressor head pressure level), for EC-type fans - variable 0-10VDC signal
(proportional to the compressor head pressure level). Refer to the fans’ type and wiring diagram if/when needed.
If the fluid cooler is equipped with the built-in pump package (to establish cooling fluid flow between dehumidifier
and the fluid cooler or to serve as additional/booster pump), the said pump is also engaged along with fluid cooler
fans – pump would stay engaged while fans are engaged (regardless of the fans’ speed).
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