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Internal Wiring
A diagram detailing the internal wiring of this unit is located
on the Goodman labeled access panel. If any of the original
wire supplied with the appliance must be replaced, the
wire gauge and insulation must be the same as the original
wiring.
1. For branch circuit wiring (main power supply to unit
disconnect), the minimum wire size for the length
of run can be determined using the circuit ampacity
found on the unit rating plate and the table below.
From the unit disconnect to the unit, the smallest wire
size allowable may be used for the ampacity, as the
disconnect must be in sight of the unit.
2. Wire size based on 60°C rated wire insulation and
30°C Ambient Temperature (86°F).
3. For more than three conductors in a raceway or
cable, see the N.E.C. for derating the ampacity of
each conductor.
To avoid property damage or personal injury due to fire,
use only copper conductors.
To avoid electrical shock, wiring to the unit must be
polarized and grounded.
For unit protection, use a fuse or hacr circuit breaker that
is in excess of the circuit ampacity, but less than or equal
to the maximum overcurrent protection device. DO NOT
EXCEED THE MAXIMUM OVERCURRENT DEVICE SIZE
SHOWN ON UNIT DATA PLATE.
All line voltage connections must be made through
weatherproof fittings. All exterior power supply and ground
wiring must be in approved weatherproof conduit. Low
voltage wiring from the unit control panel to the thermostat
requires coded cable. See below for ground level and
rooftop wiring.
CIRCULATING AIR AND FILTERS
Airflow Conversion
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.
CAUTION
WARNING
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). See "Unit Dimensions"
section for chassis sizes.
Duct Cover Installation
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
(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.
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