10
Ultra-Aire 90H Installer’s & Owner’s Manual
11
Ultra-Aire 90H Installer’s & Owner’s Manual
FOR HVAC INSTALLER ONLY
WARNING:
TO AVOID TRANSFORMER DAMAGE ONLY
CONNECT THE WHITE WIRE TO THE CONTROL IF A DAMPER IS
USED.
The white wire controls the optional motorized damper that
can be installed into a fresh air duct. This provides the ability
to control when fresh air is introduced into the building by
using the ventilation timer function labeled “DMP” on the
control (See Section 3.7).
IF THE MOTORIZED DAMPER IS
NOT USED,
DO NOT CONNECT THE WHITE WIRE TO THE
CONTROL OR DAMAGE TO THE TRANSFORMER MAY
RESULT.
Simply leave the (DMP) terminal unused if the
damper is not used, and cap off the white lead from the Ultra-
Aire dehumidifier.
2.3 Auxiliary relay operation
At times it may be desirable to coordinate fan operation
of the central heating/cooling system with dehumidifier
operation. The DEH 3000 features a relay that provides
this ability. The relay terminals labeled NC, COM and NO
operate according to the following chart:
Dehumidification
Operation
COM/NO
COM/NC
ON
CLOSED
OPEN
OFF
OPEN
CLOSED
Common uses (assuming standard thermostat wiring color
schemes as noted):
Disengage A/C during dehumidification
Redirect the yellow thermostat wire to the NC terminal. Wire
the yellow wire from the A/C to the COM terminal.
Engage the A/C central fan during dehumidification
1. Disconnect the green wire that runs to the fan relay from the
screw on the thermostat.
2. Connect the green wire that runs to the fan relay to the COM
screw on the DEH3000 board.
3. Run a wire from the red wire screw on the thermostat to the NO
(Normally Open) screw on the DEH3000 board.
4. Run a wire from the green wire screw on the thermostat to the
NC (Normally Closed) screw on the DEH3000 board.
The central fan should run when the Thermostat fan switch
is turned to ON and when the dehumidifier is operating.
2.4 Dehumidifier lockout/activation:
AC sensor feature
The control has the ability to activate the dehumidifier or
deactivate the dehumidifier when the air conditioner is running.
Standard wire colors for thermostats are as follows:
Description
Color
Terminal code
24VAC Return
Red
R
Call for Heat
White
W or W1
Force Fan On
Green
G
Compressor
Call for Cooling
Yellow
Y or Y1
