Mitsubishi Electric PQHY-P-TLMU-A Manuel D'installation page 8

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9
[Fig. 9.2.3]
If there is no trap, oil can accumulate inside the pipe, causing a shortage of oil damaging the compressor.
2m[6ft]
E
F
[Fig. 9.2.4]
<A> Install the piping so that oil will not accumulate in the stopped heat source unit. (both the liquid and the gas side for PQHY-P·TSLMU-A/YSLMU-A,
unit 1
1.
C
D
The NG example shows that oil accumulates because the units are installed on a reverse gradient while unit 1 is in operation, and unit 2 is stopped.
unit 1
2.
unit 1
h1
8
D
A
E
G
unit 2
A
unit 2
unit 2
9.2
B
C
A : Indoor unit
B
C : Within 2 m [6ft]
D : Twinning pipe
E : Field-supplied piping
F : Twinning kit
G : Straight pipe length that is 500mm [19-11/16 in] or more
unit 1
unit 2
C
D
unit 1
unit 2
h1
D
A
B

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