If ANY refrigerant tubing is buried, provide a 6 in. (152 mm)
vertical rise at service valve. Refrigerant tubing lengths up to
36 in. (914mm) may be buried without further special
consideration. For lengths above 36 in. (914mm), consult
your local distributor. Failure to follow this caution could
result in unit damage.
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.
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant tubing of correct size
and condition. For tubing requirements beyond 50 ft (15.24m),
substantial capacity and performance losses can occur. Following
the recommendations in the Residential Split System Long-Line
Application Guideline will reduce these losses. Refer to Table 1
for field tubing equivalent line length. Refer to Table 2 for
accessory requirements.
For buried-line applications greater than 36 in. (914mm), consult
your local distributor.
If refrigerant tubes of indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT
Outdoor unit contains correct system refrigerant charge for opera-
tion with indoor unit of same size when connected by 15 ft (4.57m)
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 Table 1.) Use refrigerant grade tubing.
SWEAT CONNECTION
Service valves are closed from factory and ready for brazing. After
wrapping the service valve with a wet cloth, braze sweat connec-
tions using industry accepted methods 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.
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
Step 7—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.
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters
UNIT SIZE
LIQUID
VAPOR
VAPOR (LONG LINE)
Connection Diameter
Tube Diameter
Connection Diameter
Tube Diameter
Connection Diameter
Tube Diameter
In.
mm
In.
mm
In.
mm
In.
mm
In.
mm
In.
mm
024
3/8
9.53
3/8
9.53
5/8
16.00
5/8
16.00
5/8
16.00
3/4
19.05
036
3/8
9.53
3/8
9.53
3/4
19.05
3/4
19.05
3/4
19.05
7/8
22.35
048
3/8
9.53
3/8
9.53
7/8
22.35
7/8
22.35
7/8
22.35
1-1/8
28.70
060
3/8
9.53
3/8
9.53
7/8
22.35
1-1/8
28.70
7/8
22.35
1-1/8
28.70
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.
Fig. 3—Piping Installation
A94028
INSULATION
VAPOR TUBE
LIQUID TUBE
OUTDOOR WALL
INDOOR WALL
LIQUID TUBE
VAPOR TUBE
INSULATION
CAULK
Avoid contact between tubing and structure
NOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1
″
MIN.
SUSPENSION
3
→
Summary of Contents for 38TUA
Page 11: ...11...
