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MULTI V Water IV
8. Refrigerant Piping System
8.5 Oil trap application method between outside units
•
Because of the possibility of oil being accumulated in the outside unit that has stopped, when there is a height
difference between outside unit pipes or if the pipe distance between the outside units is over 2m, you must
always apply an oil trap. (But, the oil trap between outside units is limited to 1 time and is only applied to the gas
pipe.)
•
If the pipe distance between the outside units is 2m or below, and if the location of the main pipe is lower than
that of the outside unit and if the location of the main pipe is lower than that of the outside unit, the oil trap does
not have to be applied.
•
If the location of the main pipe is higher than the location of the outside unit, be careful since the oil can be
accumulated in the stopped outside unit.
•
If there is high/low difference between the outside unit pipes, oil can be accumulated to the outside unit on the
lower location until the unit stops.
Examples of Wrong Pipe Connections
– If outside units are located at different level, oil trap must be installed after each Y branch.
– Oil trap should be located at same level of Y branch.
(Heat Pump : High Pressure Vapor / Heat Recovery : High Pressure Vapor & Low Pressure Vapor)
– If pipe is higher than outside unit, oil trap must be installed after each Y branch.
– Oil trap should be located at same level of Y branch.
(Heat Pump : High Pressure Vapor / Heat Recovery : High Pressure Vapor & Low Pressure Vapor)
30
Heat Pump
Installation of Outside Units
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