Therma-Stor Products Group 90H Condensate Water Removal, 3A Lifting Condensate, Ducting

FOR HVAC INSTALLER ONLY

IMPORTANT

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.

4.3Condensate (Water) Removal

IMPORTANT

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 pump cover. This switch should be installed in series with the field wire that connects the blue (#5) lead from the UA-90H to the the control panel. If the pump fails, this switch opens the compressor control circuit and stops water production before the reservoir overflows. The UA-90H will continue to ventilate or circulate air as normal, but will not dehumidify until this switch closes.

4.4 Ducting

IMPORTANT

Attention: For ventilation only! Remove label and 6’’ round insulation from the duct prior to installing ducting for outside ventilation. For all other applications leave in place.

For the ideal installation, draw air from the central part of the home and return it to the isolated areas of the home like the bedrooms, den, utility room, or family room. The ductwork of the existing heating system can be used to supply air to the home. If the existing supply goes to isolated areas of the home, discharge the supply of the UA-90H into the supply of the existing heating system. Installation of a separate supply duct to the UA-90H from a central area is recommended.

4.4A Fresh Air/Supply Air

IMPORTANT

DO NOT draw air directly from the kitchen, laundry, or isolated basement.

You may draw air from a basement that is open to the home. All flexible ducting connected to the UA-90H should be UL listed.

A short piece of flexible ducting on all UA-90H duct connections is recommended to reduce noise and vibration transmitted to rigid ductwork in the structure. Ducting the UA-90H as mentioned requires consideration of the following points:

Duct Sizing: For total duct lengths up to 25’, use a minimum 10" diameter round or equivalent rectangular. For longer lengths, use a minimum 12" diameter or equivalent. Grills or diffusers on the duct ends must not excessively restrict airflow.

5 Ultra-Aire 90H Installer’s & Owner’s Manual