Ventilation Timer/Humidity Control Panel
(P/N 4024125)
(Figure 2, p.7)
4.6D
Ventilation Timer and Humidity Control WITH Fresh Air
AND Motorized Damper
DEH 3000 Digital Control
(P/N 4028539; with remote: P/N 4028407)
4.6E
Digital Controller WITH Fresh Air AND Damper
4.6F
Digital Controller WITHOUT Fresh Air
4.1A Humidity/Fan Control Panel WITHOUT Fresh Air
Ventilation or Damper
The humidity/fan control panel automatically controls the humidity
of the living space. The humidity/fan control panel contains an
adjustable humidity control and a fan switch. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. When the fan switch is in the “ON”
position, air will be continually filtered and circulated throughout
the home. For humidity control operation refer to section 4.2.
4.1B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
The humidity/fan control panel automatically controls the humidity
of the living space. The humidity/fan control panel contains an
adjustable humidity control and a fan switch. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. Outside air is continually introduced
whenever fan is “ON.” Manual operation of fan filter switch controls
outside air ventilation. Since the fan operates whenever the Ultra-
Aire XT150H is dehumidifying outside air will also be introduced.
For humidity control operation refer to section 4.2.
4.1C Humidity/Fan Control Panel WITH Fresh Air
Ventilation AND Damper
In this configuration, a motorized damper has been installed in the
fresh air duct. When the fan/filter switch is in the “OFF” position,
the damper is closed. The Ultra-Aire XT150H will then circulate and
dehumidify air to provide humidity control.
When the fan/filter switch is in the “ON” position, the motorized
damper will open and the fan will run, introducing outside air. The
unit may or may not be dehumidifying in the ventilation mode,
depending on the humidity control setting. See Section 4.2 for
humidity control operation.
4.1D Ventilation Timer and Humidity Control WITH
Fresh Air AND Motorized Damper
Refer to sections 4.7 through 4.9C.
4.1E DEH 3000 Digital Control WITH Fresh Air
AND Damper
Refer to Section 5.
4.1F DEH 3000 Digital Control WITHOUT Fresh Air
Refer to Section 5.
4.2 Humidity Control Adjustment
Set the humidity control to the desired humidity level for the home.
Turning the knob clockwise results in a drier setting. See the back
of the control panel cover for set points.
The dehumidifier will run continuously until
the relative humidity (RH) is reduced to the
humidity control dial setting. Setting the
humidity control to lower RH levels will NOT
increase the dehumidification rate; the unit
will simply run longer to reduce the RH to
the setting. The Ultra-Aire XT150H unit (and
refrigerant-based dehumidifiers in general) will reduce a warm
space’s RH to a lower level than that of a cool space. Therefore
there is no benefit to set the humidity control to excessively
low levels in cool rooms; doing so will result in long periods of
ineffective dehumidifier run time. Settings below 45% are not
recommended.
4.3 Fan/Filter Switch
Turning ON the fan/filter switch will
cause the Ultra-Aire XT150H fan to run
continuously, whether the Ultra-Aire XT150H
is dehumidifying or not. This function is
desirable if the unit is used for air circulation
and filtration to achieve maximum indoor air
quality. When the switch is ON; air will be
constantly filtered through the Ultra-Aire XT150H and circulated
throughout the house. When the switch is OFF the fan will operate
only when the humidity control calls for dehumidification or when
the ventilation timer calls for ventilation.
4.4 Ventilation Timer
The ventilation timer controls the fan and the motorized fresh
air damper. When the ventilation timer is activated, the Ultra-
Aire XT150H will circulate the indoor air, and bring in fresh air
from outside. The ventilation timer should be set for the required
ventilation of the residence. The home should be ventilated with
fresh air as suggested by applicable codes and standards or as
required by the homeowner. The ventilation timer is an electronic
timer that displays the current time. This timer has battery backup,
so it will not require resetting after a power outage. Following
a prolonged power outage the display of the timer will flash on
and off indicating a power outage has occurred. The one-minute
time increments of the ventilation timer allow you to program the
ventilation of your home to fit your schedule.
FOR HVAC INSTALLER ONLY
8
Figure 4
Fan/Filter Switch
Figure 3:
Humidity Control
Adjustment Knob
Humidity/Fan Control Panel
P/N 4024155
Ventilation Timer & Humidity
Control Panel • P/N 4024125
Ultra-Aire XT150H Installer’s & Owner’s Manual
