FOR HVAC INSTALLER ONLY
Crawlspace Installation: Install a separate return for the UA-90H
in a central area of the structure. Optional: Duct the supply of the UA-90H to a 10" x 10" x 10" tee/damper that is 20% open to the crawlspace if desired. Duct the other side of the tee to the air supply of the existing HVAC system with a backdraft damper. Connect an insulated duct from outside to the 6" collar of the UA- 90H if you wish to provide optional ventilation air.
Instead of installing a separate return to the UA-90H, and if the existing system has multiple returns, it is possible to select one to disconnect from the existing forced air system and use it for the dedicated 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.
4.4D Installation in an Attic with an Existing Forced Air HVAC System
IMPORTANT
ALWAYS install a catch pan with a drain or float interrupt for condensate under the UA-90H in an attic or condensate may damage the living space below.
The interrupt switch should be installed in series with the field wire that connects the blue (#5) lead from the UA-90H to the blue (#5) lead on the control panel. If overflow occurs, this switch opens the compressor control circuit and stops water production before the catch pan overflows. The UA-90H will continue to ventilate or circulate air as normal, but will not dehumidify until this switch closes.
The preferred method of installation is to create a separate return for the UA-90H in a central area of the structure. Duct the supply of the UA-90H to the air supply of the existing HVAC system. Connect an insulated duct from outside to the 6" collar of the UA-90H if you wish to provide fresh make-up air. Adjust a damper in the duct to provide the desired.
4.4E Installation in a Structure with No Existing Forced Air HVAC System
When installing the UA-90H in a structure that does not have a forced air HVAC system, a single return for the UA-90H 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-
90H 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-90H to be filtered and dehumidified. 6" diameter duct is recommended for branches to the bedrooms, 8" diameter duct is recommended for branches to larger areas. Connect an insulated duct from outside to the 6" collar of the UA-90H if you wish to provide ventilation. See Figure 4.
4.4F Ducting for High Efficiency Filtration
The standard filter included with the UA-90H is a very effective MERV 11 media filter. Additional filtering options, including charcoal filtration and 95% efficient filtration, are available with an optional external filter housing that may be installed with the UA-90H. The filter box is ducted to the intake of the UA-90H, and the intake ducting is then connected to the intake side of the filter box. See the optional accessories list or call the factory for details.
4.5 Noise Abatement
A length of 10 feet or more of acoustical flex ducting on the outlet of the UA-90H will reduce air noise from the fan. A length of flexible ducting on all UA-90H duct connections is recommended to reduce noise transmitted to rigid ductwork in the structure.
4.6 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.
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Figure 1: | Figure 2: Ventilation Timer |
Humidity/Fan Control Panel | and Humidity Control Panel |
Part No. 4024155 | Part No. 4024125 |
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