3
Use only refrigerant grade (dehydrated and sealed) copper tub-
ing 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 plumb-
ing, ductwork, floor joists, wall studs, floors, and walls. When
running 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
between 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 suitable for line lengths of 79 feet or less. If a
run of more than fifty feet is required, refer to Remote Cooling
Service Manual, or TP-106 Long Line Set Application R-22, or
TP-107 Long Line Set Application R-410A or contact your dis-
tributor 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
existing 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 compat-
ible with the type of refrigerant being used; otherwise, the in-
door coil must be replaced.
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 Rem ote Cooling
Service Manual or contact your distributor for assistance.
B
URYING
R
EFRIGERANT
L
INES
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.
R
EFRIGERANT
L
INE
C
ONNECTIONS
IMPORTANT
To avoid overheating the service valve, TXV valve,
or filter drier while brazing, wrap the component
with a wet rag, or use a thermal heat trap compound.
Be sure to follow the manufacturer’s instruction when
using the heat trap compound. Note: Remove
Schrader valves from service valves before brazing
tubes to the valves. Use a brazing alloy of 2%
minimum silver content. Do not use flux.
