Therma-Stor Products Group UA-135H - Manual (Page 7)

Ultra-Aire return. Always select a return from a central location in the
structure in an area that is always open to the rest of the structure.
Do not use a return from a room that may have its door closed much
of the time or, alternatively, install a separate return from the open
part of the house.
4.5F 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-135H in an attic or condensate may
damage the living space below.
The preferred method of installation is to create a separate return
for the UA-135H in a central area of the structure. Duct the supply of
the UA-135H to the air supply of the existing HVAC system. Connect
an insulated duct from outside to the 6" collar of the UA-135H if you
wish to provide fresh make-up air. Adjust a damper in the duct to
provide the desired amount of fresh air. See Figure 7.
4.5G Installation in a Structure with
Two Forced Air HVAC Systems
When installing the UA-135H in a space with two HVAC systems, the
outlet air of the UA-135H may be ducted into the supply ducting of
each system. The 10" outlet of the UA-135H may be split into two
separate ducts by using a “T” or “Y” adapter. It is recommended to
install a manual damper (balancing damper) and a backdraft damper
in each duct, then connect to the supply ducting of each HVAC
system. The balancing dampers provide the ability to control airflow
into each system. The backdraft dampers prevent cross flow of air
from one system to the other when only one system is active. See
Figure 8.
4.5H Installation in a Structure with
No Existing Forced Air HVAC System
When installing the UA-135H in a structure that does not have a
forced air HVAC system, a single return for the UA-135H should be
installed in central open area of the structure. DO NOT locate the
return in a bathroom or a kitchen. The supplies of the UA-135H
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-135H 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. Connect
an insulated duct from outside to the 6" collar of the UA-135H if you
wish to provide fresh make-up air.
4.6 Compressor Release & Noise Abatement
The compressor is attached to the partition with one cable tie and a
1.5" x 1.5" x 4.5" foam pad to secure it during shipment. This rigid
attachment must be removed once the unit is installed and may
cause noise from compressor vibration. After installation, remove the
service panel, cut and remove the cable tie and foam pad securing
the compressor's accumulator to the partition. This will prevent the
compressor from transmitting vibration to the cabinet.
For further noise abatement, make sure none of the refrigeration
tubes are pressed against the cabinet or access panel. Check
that the refrigeration tubes are centered in the holes where they
pass through the partition. For additional noise control, attach
3⁄4" plywood surround.
A length of 10 feet or more of acoustical flex ducting on the outlet of
the UA-135H will reduce air noise from the impeller fan. A length of
flexible ducting on all UA-135H duct connections is recommended
to reduce noise and vibration transmitted to rigid ductwork in the
structure.
4.7 Controls
All control panels should be mounted in a central area of the
structure where it can accurately sense the humidity of the air in the
living space and be accessed. All controls require field wiring from
the unit location to the panel mount location.
To determine how each control operates the UA-135H it must first be
determined which control is being used and whether or not the 135H
is ducted for fresh air ventilation.
Humidity/Fan Control Panel (P/N 4024155)
4.7A Humidity/Fan Control Panel WITHOUT Fresh Air Ventilation or
Damper
4.7B Humidity/Fan Control Panel WITH Fresh Air Ventilation and
WITHOUT Damper
4.7C Humidity/Fan Control Panel WITH Fresh Air Ventilation AND
Damper
Ventilation Timer/Humidity Control Panel (P/N 4024125)
4.7D Ventilation Timer and Humidity Control WITH Fresh Air AND
Motorized Damper
DEH 2000 Digital Control (P/N 4024539)
4.7E Digital Controller WITH Fresh Air AND Damper
4.7F Digital Controller WITHOUT Fresh Air
FOR HVAC INSTALLER ONLY
7 Ultra-Aire 135H Installer’s & Owner’s Manual