11
CAUTION
To avoid property damage or personal injury due to fire, use
only copper conductors.
CAUTION
To avoid property damage or personal injury due to fire, use
only copper conductors.
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.
Unit Voltage
Rated
Voltage
Minimum Supply
Voltage
Maximum Supply
Voltage
208/230V
197
253
The unit transformer is factory connected for 230V
operation. If the unit is to operate on 208V, reconnect
the transformer primary lead as shown on the unit wiring
diagram. The induced draft blower on some models is
equipped with a low speed 230V lead (blue) and a low
speed 208V lead (black). If equipped, connect the induced
draft blower low speed 208V lead (black) in place of the low
speed 230V lead (blue). Place the unused 230V lead on
the “PARK” terminal located on ignition control.
NOTE: 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
6
4
4
4
3
3
2
2
150
8
6
6
4
4
4
3
3
100
10
8
8
6
6
6
4
4
50
14
12 10 10 8
8
6
6
Wiring Table
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.
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
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 #20464501NGK (medium chassis)
and #20464502NGK (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
(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.
