Installation guide

5. Repeat this procedure as indicated in Fig. 11. System will then
contain minimal amounts of contaminants and water vapor.
IEVACUATE I
IBREAKVACUUMWITH DRYNITROGENI
IEVAOUATEI
IBREAKVACUUMWITHDRYN TROGENI
IEVAOUATEI
CHECK FOR TIGHT, DRY SYSTEM I
(IF IT HOLDS DEEP VACUUM)
I
I CHARGESYSTEMI
Fig. 11--Triple Evacuation Method
A95425
FINAL TUBING CHECK
IMPORTANT: Check both indoor and outdoor unit to ensure that
_actory robing has not shifted during shipment. Ensure tubes 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 lO--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 may fluctuate above or below
permissible limits.
NOTE: Use only copper wire between disconnect switch and
unit.
NOTE: Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
of and readily accessible fi'om the unit, per Section 440-14 of
NEC.
ROUTE GROUND 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 _ault
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. 12.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
1
FIELD POWER
WIRING
FIELD GROUND
WIRING j
CONTACTOR
©
GROUND
LUG
A91306
Fig. 12--Line Power Connections
CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and
connect to leads provided in control box. (See Fig. 13.)
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 accessory 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
for a mininmm of 24 hr before starting unit. To furnish power to
heater only, set themmstat to OFF and close electrical disconnect
to outdoor unit.
A crankcase heater is required in long-line applications (tubing
greater than 50 ft and/or elevation greater than 20 It) between
indoor and outdoor units. Refer to the Application Guideline and
Service Manual_ir Conditioners and Heat Pumps Using Pu-
ron'_; Refrigerant.
Step 12--Install Electrical Accessories
Refer to the individual instructions packaged with kits or acces-
sories when installing.