14
31-5000483 Rev. 3
Refrigerant Piping
The length of refrigerant lines, and the number of bends,
determine the pressure drop which affects capacity,
efficiency, and oil return to the compressor.
The outdoor unit connections are braze type. Tube size
should always be the same diameter as the connections
provided at the service valves. Installing tubing sizes
other than those shown can result in inadequate oil return
to the compressor and excessive refrigerant charge, and
will void the warranty.
Refrigerant Piping
Model Number
12K
18K
24K
30K
36K
48K
Liquid-Gas
in.
1/4-1/2
3/8-5/8
3/8-3/4
Max.
Refrigerant
Line Length
Ft.
82
98
Max.
Elevation
Vertical Lift
Ft.
33
49
*Pipe length must not be less than 10 feet.
** Oil traps are required every 15 ft. when the outdoor
unit is installed above the indoor unit.
Choose a location that places this unit as close to the
indoor unit as possible. Use only clean refrigeration grade
tubing. Always keep the tube ends capped until you are
ready to make the final connections. Remove burrs from
cut ends of tubing. Use tube benders to avoid kinking.
Insulate the suction line with a wall thickness of at least
3/8”. Support the tubing adequately to avoid sags that can
trap oil. Isolate the tubing so as not to transmit noise to
the building structure. Avoid sharp edges that could cut
the insulation or piping.
WARNING
It is illegal to discharge refrigerant into
the atmosphere. Use proper recovery methods and
equipment when working on parts of the unit containing
refrigerant. Service should be performed by a qualified
service agency and certified technician.
Using the appropriate fittings if needed, attach the line
set to the service valve stubs.
Apply heat paste to stub next to the valve and wrap the
valve body with a wet cloth.
At the outdoor service valves, remove the valve cores.
Introduce a purging flow of dry nitrogen through the first
tube, allowing it to flow out of the flared connection stub.
Braze connections with a brazing alloy. 15% braze rod is
recommended.
Repeat the above process for the second tube.
Pairing with A‑coils
Please refer to the AHRI website for the latest approved
system matches.
The outdoor units are shipped with a refrigerant
charge(refer to the table below). An additional charge is
required when the refrigerant line between indoor and
outdoor units exceeds 25ft( Refer to the table below).
Model Number
UUC112WCD
A
UUC118WCD
A
UUC124WCD
A
UUC130WCD
A
UUC136WCD
A
UUC148WCD
A
Factory Charge
Oz 49.4 75.8 97.0 119.9 123.5 141.1
Liquid O.D. in
Inch 1/4" 1/4" 3/8" 3/8" 3/8"
3/8"
Suction O.D. in
Inch 1/2" 1/2" 5/8" 3/4" 3/4"
3/4"
Max. Refrigerant Line
between Indoor and
Outdoor
Ft
66
66
66
66
66
66
Max. Refrigerant Line
elevation between
Indoor and Outdoor
Ft
33
33
33
33
33
33
Additional charge
if refrigerant line
exceeding 25 ft
oz/
ft
0.16 0.16 0.32 0.32 0.32
0.32
Note:
Factory charge for UUC124WCDBA is 100.6 oz and
UUC130WCDBA is 119.9 oz.
INSTALLATION INSTRUCTIONS
Summary of Contents for U SeriesUC148WC Series
Page 12: ...12 31 5000483 Rev 3 INSTALLATION INSTRUCTIONS Wiring cont 36K ...
Page 13: ...31 5000483 Rev 3 13 INSTALLATION INSTRUCTIONS Wiring cont 48K ...
Page 18: ...18 31 5000483 Rev 3 NOTES ...
Page 32: ...12 31 5000483 Rev 3 INSTRUCTIONS D INSTALLATION Câblage de l unité extérieure 36K ...
Page 33: ...31 5000483 Rev 3 13 INSTRUCTIONS D INSTALLATION Câblage de l unité extérieure 48K ...
Page 38: ...18 31 5000483 Rev 3 NOTES ...
Page 52: ...12 31 5000483 Rev 3 INSTRUCCIONES DE INSTALACIÓN Cableado de la Unidad Exterior 36K ...
Page 53: ...31 5000483 Rev 3 13 INSTRUCCIONES DE INSTALACIÓN Cableado de la Unidad Exterior 48K ...
Page 58: ...18 31 5000483 Rev 3 NOTAS ...
