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Oil Traps:
To ensure proper oil return to the compressor, a P-type oil trap should be installed at
the base of each suction riser of four feet or more. The suction trap must be the same
size as the suction line. Additional traps are necessary for long vertical risers. Add a
trap for each length of pipe (approximately 20 feet) to insure proper oil return. Suction
lines must slope ¼” per 10 feet toward the compressor. Install a suction line trap at the
evaporator outlet if the suction line rises to a point higher than the connection on the
evaporator.
CAUTION
Failure to properly install oil traps can prevent sufficient oil return to the compressor
resulting in premature compressor failure.
Drain Lines:
Evaporator coil drain lines should be pitched a minimum of ½” per foot to allow proper
drainage and exit the walk-in as quickly as possible. Insulate and seal the drain line
where it passes through the wall. Copper drain line is required. If the refrigerated
space is 33°F or lower, drain line insulation and heat tape are required. Drain lines
must be insulated with minimum ½” thick armaflex. The drain line heat tape must be
wrapped around the copper drain line. Do not locate bends, elbows, or drain traps
within the refrigerated space. Do not reduce the drain line size. Locate a drain line P-
trap outside of the refrigerated space. Any traps exposed to low ambient temperatures
should be wrapped with a drain line heater (provide 20 watts of heat per foot of drain
line at 0°F, 30 watts per foot at -20°F.
P-Trap
Pitch drain line
½” per foot
Seal and
Insulate
Typical Drain Installation
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