3
To avoid possible explosion, use only returnable (not
disposable) service cylinders when removing refrig-
erant 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.
WARNING
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 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.
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 Rem ote 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
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. To facilitate oil return to the com-
pressor, 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.
