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Refrigerants are heavier than air. They can "push out" the oxygen
in your lungs or in any enclosed space. To avoid possible difficulty
in breathing or death:
•
Never purge refrigerant into an enclosed room or
space. By law, all refrigerants must be reclaimed.
•
If an indoor leak is suspected, thoroughly ventilate the
area before beginning work.
• Liquid refrigerant can be very cold. To avoid possible
frostbite or blindness, avoid contact and wear gloves
and goggles. If liquid refrigerant does contact your
skin or eyes, seek medical help immediately.
• Always follow EPA regulations. Never burn refrigerant,
as poisonous gas will be produced.
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
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 foun-
dation 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 in-
sulated or suspension type hanger. Keep both lines separate and
always insulate the suction line.
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.
NOTE: If using existing indoor coil and changing refrigerant types,
ensure the indoor coil and metering device are compatible with the
type of refrigerant being used. If new indoor coil is required check
spec sheet or AHRI for approved coil. If system is being replaced
due to compressor electrical failure, assume acid is in system. Refer
to Service Procedure S-115 Compressor Burnout in service manual
for clean-up procedure.
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