3
To avoid possible explosion:
Never apply flame or steam to a refrigerant cylinder. If you
must heat a cylinder for faster charging, partially immerse
it in warm water.
Never fill a cylinder more than 80% full of liquid refrigerant.
• Never add anything other than R-410A to an R-410A cylinder.
The service equipment used must be listed or certified for the
type of refrigerant used.
• Store cylinders in a cool, dry place. Never use a cylinder
as a platform or a roller.
•
•
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 lbs.
When in doubt, do not use cylinder.
Refrigerant Lines
NOTE: For improved refrigerant management, equip the evaporator
coil with a field-supplied thermal expansion valve (TXV) and the
liquid line with a field-supplied liquid line solenoid. Ensure the
solenoid is installed as close as possible to the evaporator coil to
prevent refrigeration migration in the compressor “OFF” cycle.
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.
Suct
Liq
Suct
Liq
Suct
Liq
7 1/2
1 1/8
5/8
1 3/8
5/8
1 3/8
5/8
10
1 3/8
5/8
1 5/8
5/8
1 5/8
5/8
Cond Unit
(Tons)
REFRIGERANT LINE LENGTH (ft)
0-24
25-49*
50-74**
Line Diameter (In. OD)
*
Full rating line size
** Lines greater than 74 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.
To facilitate oil return to the compressor, a horizontal suction
line should be pitched (1/2” per 10’ toward the condensing unit.
Filter Drier and Sight Glass
A liquid line filter drier is factory installed. Field-install the sup-
plied sight glass/moisture indicator on the liquid line as close as
practical to the service valve.
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.
Refrigerant Line Connections
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 as recommended
by the compound manufacturer. Use a brazing alloy of 2%
minimum silver content. Do not use flux.
