3.4E Installation in an Attic with an
Existing Forced Air HVAC System
ALWAYS install a catch pan with a drain or float interrupt for
condensate under the UA-150H in an attic or condensate may drip
down on the ceiling of the living space below.
Locate a separate return for the UA-150H in a central area of the
structure. Duct the supply of the UA-150H to the air supply of the
existing HVAC system Connect an insulated duct from outside to
the 6” collar of the UA-150H if you wish to provide fresh make-up
air. Adjust a damper in the duct to provide the desired amount of
fresh air.
3.4F Installation in a Structure with
Two Forced Air HVAC Systems
Attach the UA-150H return to an independent return from the upper
level. Attach the UA-150H supply to the supply of the basement
HVAC system. This will promote circulation of air through the whole
structure from the upper level to the lower level through the UA-
150H. If the UA-150H is not connected to both HVAC systems, it
will not control the humidity and ventilation of the entire structure.
Connect an insulated duct from outside to the 6” collar of the UA-
150H if you wish to provide fresh make-up air.
3.4G Installation in a Structure with No Existing Forced
Air HVAC System
When installing the UA-150H in a structure that does not have a
forced air HVAC system, a single return for the UA-150H should be
installed in central open area of the structure. DO NOT locate the
return in a bathroom or a kitchen. The supply of the UA-150H should
be located in the remote areas of the structure (such as bedrooms,
den, etc..). By ducting this way, the air inside the structure will
circulate through the UA-150H to be filtered and dehumidified. 4"
diameter duct is recommended for branches to the bedrooms, 6"
diameter duct is recommended for branches to larger areas. Refer to
section 3.4B for branch duct sizing. Connect an insulated duct from
outside to the 6” collar of the UA-150H if you wish to provide fresh
make-up air.
3.5 Quiet Installation
The compressor is attached to the cabinet with two cable ties to
secure it during shipment. This rigid attachment is not necessary
once the unit is installed and may cause noise from compressor
vibration. After installation, cut the cable ties to free the compressor
from the cabinet.
REMOVE THE HORIZONTAL CABINET SUPPORT TO WHICH THE
COMPRESSOR IS ATTACHED. The ends of the support are notched
so that the support can easily be removed. Cut the strips of metal on
each end and remove the support section from the cabinet. This will
prevent the compressor from transmitting vibration to the cabinet.
Make sure none of the compressor tubes are pressed against the
cabinet or access panel. Check that the compressor tubes are
centered in the holes where they pass through the drain pan.
A length of 10 feet or more of acoustical flex ducting on the outlet of
the UA-150H will reduce air noise from the impeller fan. A length of
flexible ducting on all UA-150H duct connections is recommended
to reduce noise and vibration transmitted to rigid ductwork in the
structure.
Install an external insulation kit.
4. Controls
The UA-150H can be equipped with various accessories to enhance
its operation. A remote control panel must be used with the UA-
150H. There are three remote control from which to choose. The
humidity/fan control panel is used to control humidity and the
impeller fan. Fresh air is introduced when the impeller fan operates.
The impeller fan operates when dehumidifying or the fan switch
is on. The ventilation timer and humidity control panel are used to
control humidity, the impeller fan, and preset ventilation schedules.
The quantity of fresh air should be 10 ft3/min of fresh air per person
plus 1 ft3/min per 100 ft2 of floor space.
4.1 Humidity/Fan Control Panel
See Figure 1: 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. 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
FOR HVAC INSTALLER ONLY
7
Ultra-Aire 150H Installer’s & Owner’s Manual
Figure 1:
Humidity/Fan Control Panel
Part No. 4024155
Figure 2:
Ventilation Timer
and Humidity Control Panel
Part No. 4024125
