Therma-Stor Products Group 90H - Manual (Page 4)

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4.1B Space
Location should have enough clearance to handle the unit’s overall
dimensions as well as the necessary return/supply ductwork to the
unit.
n 4.1C Low Voltage Wiring
Unit location should be in an area where field wiring the remote
controls (low voltage) to the unit will be possible.
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4.1D Back-Draft Damper
It is recommended that a back draft damper be used in the
discharge duct of the UA-90H, especially when connecting to the
supply ducting system. The backdraft damper prevents supply air
from counter flowing through the UA-90H when it is not operating.
The unit location should be chosen to allow installation of this
accessory if requested by the end user.
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4.1E Support Structure and Suspension
Place the UA-90H on supports to raise the base of the unit. Do not
place the UA-90H directly on structural building members without
vibration absorbers or unwanted noise may result.
The UA-90H may be suspended with steel hanger straps (plumbers
tape) or a suitable alternative from structural members, as long
as the suspending assembly supports the UA-90H’s base in its
entirety. Do not hang the UA-90H from the cabinet. Remember to
place a drain pan under the unit if it is suspended above a finished
area or above an area where water leakage could cause damage.
4.2 Electrical Requirements
WARNING!
Do not allow the yellow lead from the ultra-aire to
contact the red lead from the ultra-aire or damage to
the transformer will result.
The UA-90H plugs into a common grounded 115VAC outlet. The
device draws 6.3 Amps under normal operating conditions. If used
in an area which may become wet, a ground fault interrupter (GFI)
protected circuit is recommended. Please, consult local electrical
codes for any further information.
Therma-Stor LLC offers a family of control devices for use with the
UA-90H. The controls are to be located remotely from the unit and
located in the space to be conditioned. The controls are low voltage
(24 volt) and should be connected to the UA-90H with low voltage
wire (thermostat or other appropriate).
CAUTION!
Do not install the control panel where it may not accurately
sense the relative humidity such as near HVAC supply
registers, near exterior doors, on an outside wall, near a
window, or near a water source.
The installer must supply the wiring between the UA-
90H and the control panel. Be sure to safely route the
control wiring to prevent damage during installation.
CAUTION!
Do not cross wires when connecting the UA-90H and the remote
control panel or damage to the transformer may result. The remote
controls of the UA-90H are powered by a low voltage circuit
(24VAC) and must NEVER contact or be connected to a high voltage
circuit.
The control wires leaving the UA-90H and the remote control
panels are numbered and color-coded to prevent confusion. Some
of the control wires leaving the UA-90H may not be used with
certain control panels and should be left unconnected with wire
nuts taped onto the stripped ends for safety. Be sure to consult the
electrical schematic in this manual or inside the access panel of
the UA-90H before making control connections.
4.3 Condensate (Water) Removal
CAUTION!
A trap in the drain line is preferred, but not required for the unit to
drain properly. Local codes may require a trap. Use care to keep the
pipe assembly as flat to the floor as possible. Kinks and/or humps
will prevent proper drainage. The UA-90H generates condensate.
Install a 3/4" male nominal pipe thread adapter to the drain pan.
It is necessary to assemble your own drain pipe assembly utilizing
3/4" PVC pipe to get the condensate to a floor or other drain. Pipe is
commonly available in 10’ lengths from building supply, plumbing
or hardware stores. Grade of pitch should be 1" per 10'.
4.3A Lifting Condensate
An optional condensate pump kit may be installed if a lift is
required to dispose of the condensate. The condensate pump can
be ordered direct from the factory. See the optional parts list in
Section 8 for information on the kit.
4.3B Condensate Pump Kit
An optional condensate pump kit is available from the factory for
use with the UA-90H. Condensate is automatically pumped to a
remote location when the water level in the pump’s reservoir rises
to close the float switch. The pump also contains a safety float
switch. The white leads from this switch extend from beneath the
FOR HVAC INSTALLER ONLY
4 Ultra-Aire 90H Installer’s & Owner’s Manual 5 Ultra-Aire 90H Installer’s & Owner’s Manual