3
WARNING
To avoid possible explosion, use only returnable (not
disposable) service cylinders when removing refrigerant
from a system.
•
Ensure the cylinder is free of damage which could lead
to a leak or explosion.
•
Ensure the hydrostatic test date does not exceed 5
years.
•
Ensure the pressure rating meets or exceeds 400 psig.
When in doubt, do not use cylinder.
Refrigerant Lines
CAUTION
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.
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 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 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 TP-107
R-410A Long Line Set Application Guidelines or contact
your distributor 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 f eet in length or v ertical elev ation changes more than
50 f eet
refer to TP-
107 R
-
410A Long Line Set Application Guidelines
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.
Existing Line Sets
Where possible, drain as much residual compressor
oil from existing systems, lines, and traps; pay close
attention to low areas where oil may collect. Use of an
approved flushing agent is recommended followed by a
nitrogen purge to remove any remaining flushing agent
from the lines or indoor coil. Replacement of indoor coil is
recommended.
