3
Refrigerant Lines
The compressor POE oil for R-410A units is extremely susceptible
to moisture absorption and could cause compressor failure. Do
not leave system open to atmosphere any longer than necessary
for installation.
CAUTION
Use only refrigerant grade (dehydrated and sealed) copper tubing
to connect the condensing unit with the indoor evaporator. After
cutting the tubing, install plugs to keep refrigerant tubing clean
and dry prior to and during installation. Tubing should always be
cut square keeping ends round and free from burrs. Clean the
tubing to prevent contamination.
Do NOT let refrigerant lines come in direct contact with plumbing,
ductwork, floor joists, wall studs, floors, and walls. When run-
ning refrigerant lines through a foundation or wall, openings
should allow for sound and vibration absorbing material to be
placed or installed between tubing and foundation. Any gap be-
tween foundation or wall and refrigerant lines should be filled
with a pliable silicon-based caulk, RTV or a vibration damping
material. Avoid suspending refrigerant tubing from joists and studs
with rigid wire or straps that would come in contact with the
tubing. Use an insulated or suspension type hanger. Keep both
lines separate and always insulate the suction line.
These sizes are recommended for line lengths of 79 feet or less to
obtain optimum performance. For alternate line sizing options or
runs of more than 79 feet, refer to Remote Cooling Service Manual,
or TP-107 Long Line Set Application R-410A, or contact your dis-
tributor for assistance.
Cond
Unit
Tons
Suct
Liq
Suct
Liq
Suct
Liq
1 1/2
5/8
1/4
3/4
3/8
3/4
3/8
2
5/8
1/4
3/4
3/8
3/4
3/8
2 1/2
5/8
1/4
3/4
3/8
7/8
3/8
3
3/4
3/8
7/8
3/8
1 1/8
3/8
3 1/2
7/8
3/8
1 1/8
3/8
1 1/8
3/8
4
7/8
3/8
1 1/8
3/8
1 1/8
3/8
5
7/8
3/8
1 1/8
3/8
1 1/8
3/8
Line Diameter (In. OD)
RECOMMENDED INTERCONNECTING TUBING (Ft)
0-24
25-49
50-79*
* Lines greater than 79 feet in length or vertical elevation changes more
than 50 feet refer to the Remote Cooling Service Manual or contact your
distributor for assistance.
Insulation is necessary to prevent condensation from forming
and dropping from the suction line. Armflex (or satisfactory
equivalent) with 3/8” min. wall thickness is recommended. In
severe conditions (hot, high humidity areas) 1/2” insulation may
be required. Insulation must be installed in a manner which
protects tubing from damage and contamination.
Where possible, drain as much residual compressor oil from ex-
isting systems, lines, and traps; pay close attention to low areas
where oil may collect. NOTE: If changing refrigerant types, ensure
the indoor coil and metering device is compatible with the type of
refrigerant being used; otherwise, the indoor coil must be replaced.
Burying Refrigerant Lines
If burying refrigerant lines can not be avoided, use the following
checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines in
waterproof material (conduit or pipe) sealing the ends where
tubing enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab,
ensure lines are adequately protected and sealed.
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