FOR HVAC INSTALLER ONLY
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
