All ductwork exposed to the outdoors must include a weatherproof barrier and adequate insulation.
A duct system should be installed in accordance with Standards of the National Board of Fire Underwriters for the Installation of Air Conditioning, Warm Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B.
The supply duct from the unit through a wall may be installed without clearance. However, minimum unit clearances as shown in the appendix must be maintained. The supply duct should be provided with an access panel large enough to inspect the air chamber downstream of the heat exchanger. A cover should be tightly attached to prevent air leaks.
For duct flange dimensions on the unit refer to the Unit Dimension illustration in the appendix.
For
If desired, supply and return duct connections to the unit may be made with flexible connections to reduce possible unit operating sound transmission.
FILTERS
Even though a return air filter is not supplied with this unit, there must be a means of filtering all return air. All units may be externally filtered.
Refer to the unit filter size chart in the appendix for filter size information.
Filters installed external to the unit should be sized in accordance with their manufacturer recommendations. A throwaway filter must be sized for a maximum face velocity of 300 feet per minute.
Filter Installation
IMPORTANT NOTE: When installing a filter, the air flow arrows on the filter must point toward the circulator blower.
VENTING
NOTE: Venting is
INSTALLATION - FLUE HOOD EXHAUST
1.Locate the flue hood assembly box from the blower compartment.
2.Slide screen over flanges on the lower flue hood.
3.Slide screen into hood.
4.Using the three screws provided, attach the hood (with the opening facing down) over the flue exhaust opening in the utility panel.
HOOD
LOWER |
|
FLUE |
|
HOOD | SCREEN |
|
LIP
INSTALLATION - COMBUSTION AIR INTAKE HOOD
1.Locate the second hood.
2.Using the three screws provided, attach the hood (with the opening facing down) to the heat exchanger access door.
CONDENSATE DRAIN
CONDENSATE DRAIN CONNECTION
A 3/4” NPT drain connection is supplied for condensate piping. An external trap must be installed for proper condensate drainage.
DRAIN |
|
CONNECTION |
|
UNIT | 2" MINIMUM |
FLEXIBLE |
|
3" MINIMUM | |
OR PIPE |
|
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
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