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Refrigerant Piping
•
Use only refrigerant grade copper tubes.
•
Split systems may be installed with up to 50 feet of
line set (no more than 20 feet vertical) without special
consideration (see long line set guidelines).
•
Ensure that vapor and liquid tube diameters are
appropriate to capacity of unit.
•
Run refrigerant tubes as directly as possible by
avoiding unnecessary turns and bends.
•
When passing refrigerant tubes through the wall, seal
opening with RTV or other silicon-based caulk.
•
Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, walls, and any structure.
•
Do not suspend refrigerant tubing from joists and
studs with a rigid wire or strap that comes in direct
contact with tubing.
•
Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
It is important that no tubing be cut or seals broken
until you are ready to actually make connections to the
evaporator and to the condenser section. DO NOT remove
rubber plugs or copper caps from the tube ends until
ready to make connections at evaporator and condenser.
Under no circumstances should the lines be left open to
the atmosphere for any period of time; if so, unit requires
additional evacuation to remove moisture.
Liquid Line
Line Set Length and Size
BTUH
12 ft.
25 ft.
24,000
3/8
3/8
36,000
3/8
3/8
48,000
3/8
3/8
60,000
3/8
3/8
Suction Line
Line Set Length and Size
BTUH
12 ft.
25 ft.
24,000
3/4
7/8
36,000
7/8
7/8
48,000
7/8
7/8
60,000
1-1/8
1-1/8
For lines longer than 50 ft., refer to long line set guidelines.
Table 3. Refrigerant Line Set Diameters (in.)
Page 4 of 24
50 ft.
75 ft.
100 ft.
3/8
3/8
3/8
3/8
3/8
1/2
3/8
1/2
1/2
3/8
1/2
1/2
50 ft.
75 ft.
100 ft.
3/4
7/8
7/8
7/8
7/8
1-1/8
7/8
1-1/8
1-1/8
1-1/8
1-1/8
1-1/8
Be extra careful with sharp bends. Tubing can "kink" very
easily, and if this occurs, the entire tube length will have
to be replaced. Extra care at this time will eliminate future
service problems.
It is recommended that vertical suction risers not be up-
sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Filter Drier
The filter drier is very important for proper system operation
and reliability. If the drier is shipped loose, it must be
installed by the installer in the field. Unit warranty will be
void, if the drier is not installed.
Installation of Line Sets
DO NOT fasten liquid or suction lines in direct contact with
the floor or ceiling joist. Use an insulated or suspension
type of hanger. Keep both lines separate, and always
insulate the suction line. Liquid line runs (30 feet or more)
in an attic will require insulation. Route refrigeration line
sets to minimize length.
DO NOT let refrigerant lines come in direct contact with
foundation. When running refrigerant lines through the
foundation or wall, openings should allow for a sound
and vibration absorbing material to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be filled with
a vibration damping material.
If ANY refrigerant tubing is required to be buried by state
or local codes, provide a 6 inch vertical rise at service
valve.
Issue 1946
CAUTION
506468-01
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