Dectron DS Series – Outdoor OMM 16 September 2020
Dehumidifier Main Components - BX
• Main Blower (1) is in the main blower compartment behind or next to the Compressor Compartment (3) and
Main Electric Panel (2). Some models could be equipped with two main blowers.
• Min Outdoor Air (OA) Opening (4) is optionally equipped with a motorized damper and filter(s). The Manual
OA Damper (5) is usually used to set proper amount of outdoor air intake; in some cases, it could be equipped
with modulating actuator for automatic adjustment of outdoor air intake.
o Outdoor-installed dehumidifier would have louver(s) (76) installed at the OA opening.
• Optional Min Exhaust Fan (EF) Assembly (6) (fan and motorized damper) is located on the dehumidifier’s
return air side; Exhaust Air opening in outdoor-installed dehumidifier is equipped with louver(s) (76) also.
o Min Exhaust Fan Assembly is hinged and could be opened for better access to the fan electric box.
• Dehumidifier, equipped with Heat Recovery (HR) option, would have HR glycol coils (71), installed at the Min
Exhaust (EF) and Min Outdoor Air (OA) openings, and HR pump (72), installed in return air compartment.
o If HR option is present, Min Exhaust Fan Assembly would normally be equipped with a filter rack.
• If dehumidifier is equipped with Purge option, additional Purge-exhaust fan (PF) (73) with motorized damper
would be installed on dehumidifier’s return air side, as well as additional (“Purge”) Outdoor Air (POA) (74)
opening(s), equipped with motorized dampers, would be located directly upstream of Main Filter Rack (9).
Motorized Return Air (RA) damper (75) would be located between return air side and POA opening(s).
o Outdoor- installed dehumidifier would have louvers (76) installed at the Purge-exhaust fan and Purge
Outdoor Air openings.
• Refrigeration coils - Evaporator (7) and Reheat (internal condenser) (8) - are located directly downstream of
the Main Filter Rack (9).
o Evaporator Bypass Damper (10) is located next to the evaporator coil. It helps to control compressor
suction pressure by adjusting the amount of air, bypassing the evaporator.
• Space heater (11a and 11b) location, if the dehumidifier is equipped with one, may vary:
o Hot water coil or Electric heater (11a) is usually located directly downstream of the reheat coil;
o Gas heater (11b) is usually located between main blower(s) and compressor compartment, however,
in some cases it could be installed externally.
o Gas Boiler package (not shown), if provided, either installed remotely or mounted externally on the
dehumidifier end wall (return air side).
• Compressor (13), Receiver (14) and other components are located within the Compressor Compartment (3).
o If the dehumidifier has the standard pool water heating option, the compressor circuit additionally
includes the coaxial pool water heat exchanger (15) and refrigeration pool water heating valve.
o If the dehumidifier has the water-cooled air conditioning option (equipped with fluid cooler or
connected to external water-cooling source), the compressor circuit also includes the plate heat
exchanger (16). Some models may have refrigeration suction accumulator (13a).
o Single-deck two-compressor dehumidifier would have two refrigeration circuits and two sets of
respective refrigeration devices (compressors, receivers etc.).
• Main Electric Panel contains Main Control Board (17), Operator Panel (18) and other electrical components.
Disconnect (77), if one is installed, usually located on the Compressor Compartment outer wall, opposite to
Main Electric Panel.
• Packaged Outdoor Air-Cooled Condenser (19), if dehumidifier is equipped with it, is normally mounted on the
roof or on the end wall (return air side).
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