Overcurrent Protection; High Voltage Connections; Low Voltage Connections - Goodman CONDENSING UNIT Installation & Service Reference

from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the
correct wire gauge and length.
Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installa-
tion instructions supplied with the indoor furnace/air handler for
specific wiring connections and indoor unit configuration. Like-
wise, consult the instructions packaged with the thermostat
for mounting and location information.

Overcurrent Protection

The following overcurrent protection devices are approved for
use.
• Time delay fuses
• HACR type circuit breakers
These devices have sufficient time delay to permit the motor-
compressor to start and accelerate its load.
Three Phase Compressor Rotation
CAUTION
Use care when handling scroll compressors. Dome temp-
eratures could be hot.
Three phase compressors are power phase dependent and
can rotate in either direction.
Verify proper rotation for three phase compressors by ensuring
the suction pressure drops and discharge pressure rises when
the compressor is energized. NOTE: When operated in re-
verse, a three phase scroll compressors is noisier and its cur-
rent draw substantially reduced compared to marked values.
To correct, disconnect power and switch any two leads at the
unit contactor and re-observe.

High Voltage Connections

Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro-
vided inside the control panel cover.

Low Voltage Connections

Condensing unit control wiring requires 24 Volt minimum, 25VA
service from the indoor transformer. Low voltage wiring for two-
stage units depends on the thermostat used and the number
of control wires between the indoor unit and the condensing
unit. Route control wires through the low voltage port and ter-
minate in accordance with the wiring diagram provided inside
the control panel cover.
Single-Stage Thermostat
with Two Low Voltage Wires to Remote
NOTE: For two-stage condensing units, refer to the Installation
Instructions supplied with the variable speed indoor units for
field wiring connections.
YL0/Y1
Y/Y2
O YLO/YI Y/Y2 B/C
YLO/YI Y/Y2 C R
OD UNIT
Two-Stage Thermostat
with Three Low Voltage Wires to Remote
System Start Up
CAUTION
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service
valves until the top of the stem is 1/8" from the retainer.
When opening valves with retainers, open each valve only until
the top of the stem is 1/8" from the retainer. To avoid loss of
refrigerant, DO NOT apply pressure to the retainer. When open-
ing valves without a retainer remove service valve cap and in-
sert a hex wrench into the valve stem and back out the stem
by turning the hex wrench counterclockwise. Open the valve
until it contacts the rolled lip of the valve body.
NOTE: These are not back-seating valves. It is not necessary
to force the stem tightly against the rolled lip.
NOTE: Power must be supplied to the 18 SEER outdoor
units containing ECM motors before the power is applied
to the indoor unit. Sending a low voltage signal without
high voltage power present at the outdoor unit can cause
malfunction of the control module on the ECM motor.
5
W2
Thermostat
(
Two-Stage Heating
with
Two-Stage Cooling
W1
G R
FURNACE OR
DEHUM
G R W1 W2
TWIN
AIR HANDLER