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CIRCULATING AIR AND FILTERS
A
C
IRFLOW
ONVERSION
Units can easily be converted from horizontal to down-discharge airflow
delivery. In down-discharge or high static installations, the installer should
measure the total external static and review the blower performance
charts before performing the installation. In some installations it will be
necessary to change the blower speed to provide proper air flow.
Horizontal Air Flow
Single phase models are shipped without horizontal duct covers. If needed,
these kits may be ordered through Goodman's Service Parts department.
Down Discharge Applications
Cut insulation around bottom openings and remove panels from the bottom
of the unit, saving the screws holding the panels in place.
NOTE: Single phase models require installation of horizontal duct kit
#20464501PDGK (medium chassis) and #20464502PDGK (large chassis).
D
UCTWORK
Duct systems and register sizes must be properly designed for the C.F.M.
and external static pressure rating of the unit. Ductwork should be
designed in accordance with the recommended methods of Air
Conditioning Contractors of America Manual D (Residential) or Manual Q (Commercial). 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 down-discharge applications, the ductwork should be attached to the roof curb prior to installing the unit. Ductwork dimensions
are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may
be made with flexible connections to reduce possible unit
operating sound transmission.
F
ILTERS
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 self-contained. Do not modify or block.
I
- F
H
NSTALLATION
LUE
OOD
1. Locate the flue hood assembly box in the unit.
2. Slide screen over flanges on the lower flue hood.
3. Slide screen and lower flue hood 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.
E
XHAUST
LOWER
FLUE
HOOD
LIP
11
Duct Cover Installation
HOOD
SCREEN
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