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Units with rotary or reciprocating compressors
and non-bleed TXV's require a Hard Start Kit.
The condensing unit rating plate lists pertinent electrical
data necessary for proper electrical service and
overcurrent protection. Wires should be sized to limit
voltage drop to 2% (max.) 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
installation instructions supplied with the indoor furnace/
air handler for specific wiring connections and indoor unit
configuration. Likewise, 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
Use care when handling scroll compressors.
Dome temperatures 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 reverse, a three phase
scroll compressors is noisier and its current
draw substantially reduced compared to marked
values.
To correct, disconnect power and switch any two leads at
the unit contactor and re-observe.
NOTICE
CAUTION
High Voltage Connections
Route power supply and ground wires through the high
voltage port and terminate in accordance with the wiring
diagram provided 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 terminate in accordance with the
wiring diagram provided inside the control panel cover.
Single-Stage Thermostat
with Two Low Voltage Wires to Remote
SYSTEM START UP
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 opening valves without a retainer remove
service valve cap and insert 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 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.
6
THERMOSTAT
SINGLE-STAGE HEATING
WITH
SINGLE-STAGE COOLING
CAUTION
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