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SWEAT CONNECTION — Connect tubing to fittings on outdoor
unit vapor and liquid service valves. Service valves are closed
from factory and ready for brazing. After wrapping service valve
with a wet cloth, tubing set can be brazed to service valve using
either silver bearing or non-silver bearing brazing material. Con-
sult local code requirements. Refrigerant tubing and indoor coil are
now ready for leak testing. This check should include all field and
factory joints.
Step 7—Make Electrical Connections
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage or phase imbalance (3 phase)
may fluctuate above or below permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
NOTE: Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES — Remove access
panel to gain access to unit wiring. Extend wires from disconnect
through power wiring hole provided and into unit control box.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in an
electric shock, fire, or death.
CONNECT GROUND AND POWER WIRES — Connect ground
wire to ground connection in control box for safety. Connect
power wiring to contactor as shown in Fig. 4.
DISCONNECT
PER N.E.C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
3 PHASE ONLY
FIELD GROUND
WIRING
Fig. 4—Line Power Connections
CONNECT CONTROL WIRING — Route 24-v control wires
through control wiring grommet and connect leads to control
wiring. (See Fig. 5.)
CONTACTOR
BLUE
GROUND
LUG
A94025
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded wire
to avoid excessive voltage drop.
Use furnace transformer, fan coil transformer, or accessory trans-
former for control power, 24-v/40-va minimum.
NOTE: Use of available 24-v accessories may exceed the mini-
mum 40-va power requirement. Determine total transformer load-
ing and increase the transformer capacity or split the load with an
accessory transformer as required.
Step 8—Compressor Crankcase Heater
Energize heater a minimum of 24 hr before starting unit. To
energize heater only, set thermostat to OFF and close electrical
disconnect to outdoor unit.
A crankcase heater is required if the refrigerant tubing is longer
than 50 ft.
Step 9—Install Electrical Accessories
Refer to the individual instructions packaged with the kits or
accessories when installing.
Step 10—Start-up and Check Charge
To prevent compressor damage or personal injury, observe
the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch
In scroll compressor applications:
• Dome temperatures may be hot.
• In 3-phase application, incorrect phasing will cause reverse
rotation, resulting in elevated noise levels, equalized pres-
sures and reduced current draw. Correct by reversing power
connection L1 and L2 on contactor.
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
• Back seating service valves are not equipped with Schrader
valves. Fully back seat (counter clockwise) valve stem before
removing gage port cap.
• Front seating service valves are equipped with Schrader
valves.
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
1. Fully back seat (open) liquid and vapor tube service valves.
2. Unit is shipped with valve stem(s) front seated (closed) and
caps installed. Replace stem caps after system is opened to
refrigerant flow. Replace caps finger-tight and tighten with
wrench an additional 1/6-turn for front seating valves (female
hex stem) or 1/12 turn for back seating valves (male square
stem).
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set point
is below indoor ambient temperature.
5. Set room thermostat to COOL and fan to ON or AUTO mode,
as desired. Operate unit for 15 minutes. Check system
refrigerant charge.
3
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