DISCONNECT
PER N.E.C. AND/OR
LOCALCODES
FIELD POWER
WIRING
3 PHASE ONLY
BLUE
C1
FIELD GROUND
WIRING '(_
] GROUND
LUG
CONTACTOR
q
.)
A94025
Fig. 11--Line Power Connections
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water. Refer to
Fig. i0 and proceed as follows:
i. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open
until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr. During
this time, dry nitrogen will be able to diffuse throughout the
system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 10. System will then
be free of any contaminants and water vapor.
FINAL TUBING CHECK
IMPORTANT: Cheek to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure robes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder robes, making sure wire ties on feeder robes are
secure and tight.
Step 10--Make Electrical Connections
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 to correct
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
fi'om and readily accessible fi'om unit, per Section 440-14 of NEC.
ROUTE GROI_'D AND POWER WIRES
Remove access panel to gain access to unit wiring. Extend wires
fi'om 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
See Thermostat Installation Instructions for wiring specific unit
combinations. Connect ground wire to ground connection in
control box for safety. Connect power wiring to contactor as
shown in Fig. 11.
CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combination. (See Fig. 12.)
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.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accesso W trans-
former for control power, 24vi40va minimum.
NOTE: Use of available 24v accessories may exceed the mini-
mum 40va power requirement. Determine total transformer load-
ing and increase the transfomler capacity or split the load with an
accessory transformer as required.
FINAL WIRING CHECK
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Step 11--Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required in long-line applications (tubing
greater than 50 ft. horizontal and.or elevation greater than 20 ft.
between indoor and outdoor units). Refer to Application Guideline
and Service Manual for Residential Split-System Air Conditioners
and Heat Pumps Using Puron,?_ Refrigerant.
Step 12--Install Electrical Accessories
Refer to the individual instructions packaged with kits or acces-
sories when installing.
Step 13--Start-Up
V:I["7211ii['1"/1
To prevent compressor damage or personal il_iury, 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
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