Therma-Stor Products Group UA-150H - Manual (Page 8)

panel has a cover that must remain open to the air within the living
space for accurate humidity sensing. Position the fan switch on
when the home is occupied. The impeller fan blends fresh air with
the inside air. It also filters and circulates the blended air throughout
the home.
The humidity/fan control panel can be used in conjunction with the
optional fresh air damper. When used with the optional fresh air
damper, the fan/filter switch will act as a fresh air ventilation control.
When the switch is ON (in this configuration), the impeller fan will
run, the fresh air damper will open, and fresh air will be filtered
and brought into the structure. When the switch is OFF, the fresh air
damper will close and the impeller fan will operate only when the
humidity control calls for dehumidification. Contact the factory for
instructions on this type of installation.
4.2 Ventilation Timer and Humidity Control Panel
See Figure 2: The ventilation timer and humidity control panel
automatically controls both the ventilation and the humidity of
the living space. The ventilation timer and humidity control panel
contains an adjustable humidity control, a fan switch, and a
ventilation timer. This panel will control the humidity and allow
programmed ventilation of the living space. This panel works in
conjunction with the optional fresh air damper to provide ventilation.
The minimum fresh air ventilation schedule recommended is “on”
when occupied two or more people.
This panel should be mounted in a central area of the structure
where it can accurately sense the humidity of the air in the living
space. The panel has a cover that must remain open to the air within
the living space for accurate humidity sensing.
4.3 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 unit's
dehumidification rate; the unit will simply run
longer to reduce the area's RH to the setting. The UA-150H unit
(and refrigerant-based dehumidifiers in general) will reduce a warm
space's RH to a lower level than that of a cool space. It is therefore
pointless 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.
Quality humidity meters are available from the factory and are
recommended to accurately monitor humidity levels.
4.4 Fan/Filter Switch
Turning ON the fan/filter switch will cause the
the UA-150H impeller fan to run continuously,
whether the UA-150H 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
UA-150H and circulated throughout the house.
When the switch is OFF the impeller fan will operate only when the
humidity control calls for dehumidification or when the ventilation
timer calls for ventilation.
4.5 Ventilation Timer
The ventilation timer controls the impeller fan and the motorized
fresh air damper. When the ventilation timer is activated, the UA-
150H 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. Minimally, ventilate when
occupied by plus two people.
In cold climates or areas where the outdoor dew point is low at
times, ventilation can be used to dehumidify the structure. This is
accomplished by bringing the dry, low dew point air into the structure
during these times. This approach is often more economical than
running the dehumidifier to remove excess moisture from the
structure. For example; in a house that experiences condensation
on the interior surface of the windows during the winter, increasing
the amount of ventilation will often cure the problem. To avoid
condensation on windows and in walls, increase the ventilation
rate and duration immediately. Call the factory for assistance if
condensation is not eliminated.
The ventilation timer is an electronic timer that displays the current
time. This timer has a 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.
The ventilation timer has six programs with each program having
one “on” and one “off” event. A program allows the user to turn the
ventilation on at a certain day and time, then it allows them to turn
the ventilation off at a certain day and time. Each of these programs
can be repeated daily or weekly or during a specified block of days.
All six of the programs operate independently of each other.
FOR HVAC INSTALLER ONLY
8 Ultra-Aire 150H Installer’s & Owner’s Manual
Figure 4
Fan/Filter Switch
Figure 3:
Humidity Control
Adjustment Knob