Mitsubishi Electric CITY MULTI PQHY-P-TSHMU-A(-BS) Manuel D'utilisation page 7

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[Fig. 9.2.3]
2m[6ft]
<A> When the piping (from the twinning pipe) exceeds 2m [6ft], include
a trap (gas pipe only) within 2m [6ft]. Make sure the height of the
trap is 200mm [7-7/8 in] or more.
If there is no trap, oil can accumulate inside the pipe, causing a
shortage of oil damaging the compressor.
(for PQHY-P·TSHMU-A / YSHMU-A)
<B> Example of piping connection (for PQHY-P·TSHMU-A / YSHMU-A)
E
F
A : Indoor unit
B : Trap (gas pipe only)
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
9.2
D
A
B
D
A
C
G
E
[Fig. 9.2.4]
A
B
<A> The piping from the heat source units to twinning pipe must be made to
slope downwards the twinning pipe. (both the liquid and the gas side for
PQHY-P·TSHMU-A / YSHMU-A, the high-pressure side only for PQRY-
P·TSHMU-A / YSHMU-A)
<B> Slope of twinning pipes (for PQHY-P·TSHMU-A / YSHMU-A)
Make sure the slope of the twinning pipes are at an angle within ±15° to the
horizontal plane.
If the slope exceeds the angle specified, the unit may be damaged.
E
<C> Example of piping connection (for PQRY-P·TSHMU-A / YSHMU-A)
H
A : Slope downward
B : Slope upward
C : BC controller (standard or main)
D : Twinning pipe
E : Slope of the twinning pipe is at an angle within ±15° to the ground
F : Twinning pipe (low-pressure side)
G : Twinning pipe (high-pressure side)
H : Field-supplied piping (low-pressure connecting pipe: between heat source
units)
I : Field-supplied piping (low-pressure main pipe: to BC controller)
J : Field-supplied piping (high-pressure main pipe: to BC controller)
C
D
C
D
D
F
I
G
J
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