B Remote Control Electrical Connection; C Condensing Unit Electrical Power Connection; D Field Wiring The Condensing Unit - Ultra-Aire SD12 Installer's & Owner's Manual

FOR HVAC INSTALLER ONLY

3.2B Remote Control Electrical Connection

The remote controls of the Ultra-Aire SD12 are powered by a low
voltage circuit (24Vac) and must NEVER contact or be connected
to a high voltage circuit. The control wires leaving the Ultra-Aire
SD12 dehumidifier are numbered and color-coded to prevent con-
fusion. Some of the control wires leaving the Ultra-Aire SD12 may
not be used and should be left safely disconnected with wire nuts
taped onto the stripped ends. Consult the electrical schematic in
this manual (FIGURE 3) or inside the access panel of the Ultra-Aire
SD12 dehumidifier before making the control connections.
The SD12 dehumidifier is controlled using seven color-coded wires.
Green = Fan control
Blue = Dehumidification (fan and compressor) control
Red = 24volt AC power transformer neutral side (common with white)
White = 24volt AC power transformer neutral side (common with red)
Yellow = 24volt AC power transformer high side
WARNING: Allowing yellow wire to contact red or white wire
Black = control to condensing unit
Between the red/white lead and the yellow leads is a 40VA trans-
former. This low voltage power source powers the relay coils which
control the fans and compressor. This 24VAC transformer can also
be used to power HVAC accessories external to the dehumidifier.
• To turn the dehumidifier ON, make contact between yellow and
blue wires.
Dehumidifier on : Connect yellow and blue wires.
• To turn the fan ON, make contact between yellow and green wires.
Fan only on : Connect yellow and green (or brown) wires.
• To power a 24Vac HVAC accessory, connect the accessory to the
white (or red) wire and the yellow wire.
Accessory power : 24volt AC power supply available for HVAC accessories between yellow and
• Connect the Green, Blue, Red, and Yellow control wires to the
white(and/or red) wire. Red and white wires are common with each other.
remote control (See FIGURE 4).
• Connect the black wires to terminals 3 & 4 on the condensing unit
terminal block (see FIGURE 6).
• Connect the White wire to an optional 24Vac accessory such as a
power damper if used. Wire nut and tape the White wire if it is not Ultra-Aire DEH 3000 dehumidification & ventilation control
used for an accessory.
FIGURE 4: ULTRA-AIRE
DH3000 DEHUMIDIFIER
& VENTILATION CONTROL
OPTIONAL
DAMPER
Internal Connections
will destroy the transformer.
Ultra-Aire
Dehumidifier
DMP COMP FAN
6
Install the remote control in a central area of the structure where it will
sense the relative humidity of the structure accurately. Do not install the
control where it may not accurately sense the relative humidity such as
near HVAC supply registers, exterior doors, in direct sunlight, or near a
pool or spa. The installer must supply the control wiring between the
Ultra-Aire SD12 dehumidifier, the condensing unit, the remote control,
and any electrical accessories. Carefully route the control wiring to
prevent damage during installation. Be careful not to cross the wires
when connecting the Ultra-Aire SD12 Dehumidifier and the remote
control or damage to the transformer may result.

3.2C Condensing Unit Electrical Power Connection

The condensing unit requires a dedicated 120Vac 20A branch
circuit. Install a properly sized branch circuit disconnect (20A) within
sight of the unit. The Installer must supply the power wiring for the
condensing unit. The power wiring must have a Minimum Circuit
Ampacity of 20A and be run within a rain-tight conduit. The condensing
unit must be grounded as required by applicable code(s).

3.2D Field Wiring the Condensing Unit

1. Take off the panel (top), by removing the 5 screws that secure it to
the condensing unit.
2. Remove the plastic hole plugs from the conduit plate.
3. Insert the power and control wires through the conduit plate.
4. Connect the power supply wires and control wires to the correspond-
ing terminals on the terminal board.
5. Ground the condensing unit in accordance with local and national
electrical codes.
6. Secure the conduit to the conduit plate with locking nuts.
7. Install the panel (top) over the conduit plate by inserting the 5 screws
that secure it to the condensing unit.
Condensing unit electrical control connections:
Connect the black control wire (8) from the dehumidifier to terminal 4 on
(P/N 4028539; with remote: P/N 4028407)
the condensing unit terminal block.
Connect the black control wire (9) from the dehumidifier to terminal 3 on
the condensing unit terminal block.
FIGURE 5
Ultra-Aire SD12 Installer's & Owner's Manual