Therma-Stor Products Group 90H - Manual (Page 7)

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.
To determine how each control operates the UA-90H, it must
first be determined which control is being used and whether
or not the 90H is ducted for fresh air ventilation. Refer to
appropriate section.
Humidity/Fan Control Panel (P/N 4024155) (Figure 1, p.7)
4.6A
Humidity/Fan Control Panel WITHOUT Fresh Air
Ventilation or Damper
4.6B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
4.6C Humidity/Fan Control Panel WITH Fresh Air
Ventilation AND Damper
Ventilation Timer/Humidity Control Panel (P/N 4024125)
(Figure 2, p.7)
4.6D
Ventilation Timer and Humidity Control WITH Fresh Air
AND Motorized Damper
DEH 3000 Digital Control (P/N 4028539 )
4.6E Digital Controller WITH Fresh Air AND Damper
4.6F Digital Controller WITHOUT Fresh Air
4.6A Humidity/Fan Control Panel WITHOUT Fresh Air
Ventilation or Damper
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. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. When the fan switch is in the “ON”
position, air will be continually filtered and circulated throughout
the home. For humidity control operation refer to section 4.7.
4.6B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
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. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. Outside air is continually introduced
whenever fan is “ON.” Manual operation of fan filter switch controls
outside air ventilation. Since the fan operates whenever the UA-90H
is dehumidifying outside air will also be introduced. For humidity
control operation refer to section 4.7.
4.6C Humidity/Fan Control Panel WITH Fresh Air
Ventilation AND Damper
In this configuration, a motorized damper has been installed
in the fresh air duct. When the fan/filter switch is in the “OFF”
position, the damper is closed. The UA-90H will then circulate and
dehumidify air to provide humidity control.
FOR HVAC INSTALLER ONLY
6 Ultra-Aire 90H Installer’s & Owner’s Manual 7 Ultra-Aire 90H 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