LG Multi V PRHR033 Installation Manual page 23

Pipe Connection Method/Precautions for
Series connections between Outdoor units
- Separate Y branch joints are needed for series connections between
outdoor units.
- Y-branches between the outdoor units must be installed horizontally.
- Please refer to the below connection examples to install pipe
connections between outdoor units.
Pipe connection between
outdoor units (General Case)
Pipes between outdoor units
are 2 m [6.6 ft] or less
Pipes between outdoor units
are 2 m [6.6 ft] or longer
- If the distance between the outdoor units becomes more than 2 m
[6.6 ft], apply Oil Traps between the gas pipes.
- If the outdoor unit is located lower than the main pipe, apply Oil Trap.
Oil trap application method between outdoor units
- Because of the possibility of oil being accumulated in the outdoor unit
that has stopped, when there is a height difference between outdoor
unit pipes or if the pipe distance between the outdoor units is over 2
m (6.6 ft), you must always apply an oil trap. (But, the oil trap
between outdoor units is limited to 1 time and is only applied to the
gas pipe.)
- If the pipe distance between the outdoor units is 2 m (6.6 ft) or
below,
and if the location of the main pipe is lower than that of the outdoor
unit, the oil trap does not have to be applied.
- If the location of the main pipe is higher than the location of the
outdoor unit, be careful since the oil can be accumulated in the
stopped outdoor unit.
- If there is high/low difference between the outdoor unit pipes, oil can
be accumulated to the outdoor unit on the lower location until the unit
stops.
Oil Trap
The maximum pipe
length after the first
branching between the
outdoor units is 10 m
[32.8 ft] or less
2 m [6.6 ft] or less
Oil Trap
0.2 m [0.66 ft]
2 m [6.6 ft] or less
2 m [6.6 ft] or longer
Oil Trap Oil Trap
2 m [6.6 ft] or less 2 m [6.6 ft] or less
2 m [6.6 ft] or longer 2 m [6.6 ft] or longer
- If outdoor 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)
Level
- If pipe is higher than outdoor 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)
Level
- The pipes between the outdoor units must maintain horizontal
levelness or give an inclination to prevent a back flow toward the
slave outdoor unit. Otherwise, the unit may not operate properly.
(Example 1)
Toward indoor unit
(Example 2)
Toward indoor unit
(Example 3)
Toward indoor unit
(Example 4)
Toward indoor unit
Oil Trap
Level
Oil Trap
Level
Toward indoor unit
Toward indoor unit
Oil trap
Toward indoor unit
Oil trap
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