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The induced draft blower on some models is equipped
with a low speed 240V lead (blue) and a low speed 208V
lead (black). If the unit is to operate on 208V, connect the
induced draft blower low speed 208V lead (black) in place
of the low speed 240V lead (blue). Place the unused 240V
lead on the "PARK" terminal located on ignition control.
NOTE: Units are equipped with a single pole con-
tactor. Caution must be exercised when servicing
as only one leg of the power supply is broken with
the contactor.
Connect incoming power leads to terminals L1 & L2 on
contactor in the electrical control section, using wire sizes
specified in wiring table.
BRANCH CIRCUIT AMPACITY 15 20 25 30 35 40 45 50
SUPPLY WIRE LENGTH -
FEET
200
150
100
50
Wiring Table
CIRCULATING AIR AND FILTERS
Airflow Conversion
Units can easily be converted from horizontal to down-dis-
charge 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.
Duct Cover Installation
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4
4
4
3
3
2
8
6
6
4
4
4
3
10
8
8
6
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6
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14 12 10 10
8
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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 chas-
sis) and #20464502PDGK (large chassis). See "Unit
Dimensions" section for chassis sizes.
Ductwork
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 (Commer-
cial). All ductwork exposed to the outdoors must include a
weatherproof barrier and adequate insulation.
A duct system should be installed in accordance with
2
Standards of the National Board of Fire Underwriters for
3
the Installation of Air Conditioning, Warm Air Heating and
4
Ventilating Systems. Pamphlets No. 90A and 90B.
6
The supply duct from the unit through a wall may be
installed without clearance. However, minimum unit clear-
ances 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 installa-
tion manual.
If desired, supply and return duct connections to the unit
may be made with flexible connections to reduce possible
unit operating sound transmission.
Filters
To prevent property damage due to fire and loss of
equipment efficiency or equipment damage due to dust and
lint build-up on internal parts, never operate the unit
without an air filter installed in the return air system.
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 recommended filter size chart for filter size
information.
12
CAUTION
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