Refrigerant Venting—Part 2
After determining that there is obviously no flow of refrigerant venting from the
outdoor unit, a proportionally high residual amount of HC refrigerant is absorbed
within the compressor lubricant and left in the system. To empty the system
from residual HC refrigerant as much as possible, a vacuum pump should be
connected to the system. Disconnect the recovery cylinder (oil-separator) from
the system and install the vent-line to the exhaust port of the vacuum pump. The
free end of the vent-line remains on the stand as described on the previous
page of this section. Lowering the pressure in the system, the residual refriger-
ant absorbed within the lubricant starts evaporating and gets transferred with
the vacuum pump and vent-line to the ambient.
A flammable gas warning sign must be positioned close to the hose discharge
port to indicate that there is an occurrence of flammable gas during venting ac-
tivity.
D
C B
A
Vent Line
Stand
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