To prevent compressor damage DO NOT bury more than 36
in. (914mm) of refrigerant tubing. If ANY tubing is buried,
provide 6 in. (152mm) vertical rise at service valve.
OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED
INDOOR UNITS
Outdoor unit contains correct system refrigerant charge for opera-
tion with indoor unit of same size when connected by 15 ft (4.55m)
of field-supplied or factory-accessory tubing. Check refrigerant
charge for maximum efficiency.
REFRIGERANT TUBING
Connect tubing to fittings on outdoor unit vapor and liquid service
valves. (See Fig. 2.)
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
Do not operate unit in the vicinity of toxic or flammable
material. Failure to follow this warning can result in personal
injury, fire, or death.
To prevent damage to unit or service valves observe the
following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
SWEAT CONNECTION
Use refrigerant grade tubing. Service valves are closed from
factory and ready for brazing. After wrapping service valve with a
wet cloth, braze sweat connections using industry accepted meth-
ods and materials. Consult local code requirements. Refrigerant
tubing and indoor coil are now ready for leak testing. This check
should include all field and factory joints.
Step 5—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 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 may
fluctuate above or below permissible limits.
NOTE:
Use copper wire only between disconnect switch and
unit.
NOTE:
Install branch circuit disconnect per local codes of
adequate size to handle unit starting current. Locate disconnect
within sight from and readily accessible from unit per local codes.
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
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.
ROUTE GROUND AND POWER WIRES
Remove access panel and control box cover to gain access to unit
wiring. Extend wires from disconnect through power wiring hole
provided and into unit control box. (See Fig. 2.) Size wires per
local codes, but not smaller than minimum wire size shown on unit
rating plate.
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.
NOTE:
Use No. 18 AWG (American Wire Gage) color-coded,
insulated (35° C minimum) wire. If thermostat is located more than
100 ft (30.5m) from unit as measured along the control voltage
wires, use No. 16 AWG color-coded wires to avoid excessive
voltage drop.
CONNECT CONTROL WIRING
Route 24-v control wires through control wiring grommet and
connect to brown and blue pigtails supplied in unit splice box. (See
Fig. 6.) Use furnace transformer, fan-coil transformer, or accessory
transformer 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
accessory transformer as required.
Step 6—Compressor Crankcase Heat
When equipped with a crankcase heater, energize heater a mini-
mum 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 (15.24m).
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters
UNITSIZE
LIQUID
VAPOR
Connection Dia
Tube Dia
Connection Dia
Tube Dia
In.
mm
In.
mm
In.
mm
In.
mm
024
3/8
9.53
3/8
9.53
5/8
15.88
5/8
15.88
036
3/8
9.53
3/8
9.53
3/4
19.05
3/4
19.05
048
3/8
9.53
3/8
9.53
7/8
22.23
7/8
22.23
060
3/8
9.53
3/8
9.53
7/8
22.23
1-1/8
28.58
NOTES: 1. Tube diameters are for lengths up to 50 ft (15.24m). For tube sets over 50 ft (15.24m), consult Long-Line Application Guideline.
2. Do not apply capillary tube indoor coils to these units.
3
Summary of Contents for 38CKX
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