Ultra-Aire 98H Installation & Operation Instructions page 13

Control Connections
The control and the Ultra Aire Dehumidifier are labeled to prevent confusion. Depending on the control,
some of the screw terminals on the Ultra Aire Dehumidifier may not be used. Be sure to consult the
electrical schematic in this manual or inside the access panel of the Ultra Aire Dehumidifier before
making control connections.
A low voltage control must be used with the Ultra Aire Dehumidifier.
Ultra Aire 98H Terminal Block Control Operation:
COM
FAN
24V
DEHU
DMPR
*
Ultra Aire 120H Terminal Block Control Operation:
COM
FAN
24V
DEHU
FLOAT
FLOAT
Between the COM lead and the 24V TERMINAL is a 40VA transformer. This low voltage power source
powers the relay coils which control the fan and compressors. This 24VAC transformer can also be
used to power HVAC accessories external to the dehumidifier.
Compressor ON / Fan ON
Compressor OFF / Fan ON
Power HVAC Accessory
NOTE: 18 gauge wire needed between the Ultra Aire Dehumidifier and the external control.
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CONTROLS
24VAC Power Transformer Neutral Side
Fan Control
Transformer High Side
Dehumidification (Fan and Compressor) Control
24VAC Power Transforme Neutral Side
Spare Terminal (Open)
24VAC Power Transformer Neutral Side
Fan Control
Transformer High Side
Dehumidification (Fan and Compressor) Control
External Low Voltage Float Switch or Water Sensor
(Use Normally Closed Switch)
External Low Voltage Float Switch or Water Sensor
(Use Normally Closed Switch)
Make contact between 24V and DEHU terminals
Make contact between 24V and FAN terminals
Connect the accessory to the DMPR (OR COM) and 24V terminals
Ultra Aire 98H / 120H Installation Instructions
13