APC DX Service Manual download pdf (Page 7)

Scalable Solution for Critical Environments

APC NetworkAIR™ FM-DX 3

Dedicated Dehumidification Cycle

A dedicated dehumidification cycle allows the system to increase latent capacity without overcooling, lowering the

requirement for reheat and humidification. This is accomplished by operating one compressor, isolating a portion of

the coil from the refrigerant flow and lowering the evaporator temperature when dehumidification is required. Two

compressor operation during dehumidification mode may be enabled through the microprocessor for humid environ-

ments where more latent capacity is required.

Demand Fighting

In rooms with multiple units, return temperature and humidity may vary a small percentage. This variance may result

in units operating in conflicting modes. For example, one unit may be dehumidifying while another, within close

proximity, is humidifying. This results in demand fighting and lower overall efficiency.

Cooling Coils

Distributor

Expansion Valve

Distributor

Flow Regulator

NORMAL COOLING MODE DEHUMIDIFICATION MODE

Solenoid Closed

Sub-Floor

Raised Floor

Heat Load

Cooling Units

73°F(23.9°C)/33%

70°F(21.0°C)/55%

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APC DX Service Manual Page 7