Mitsubishi Electric CITY MULTI PURY-HP-TNU-A1 Manuel D'installation page 20

(2) The distance between the unit bottom and the pipe (H) must be 0.2 m (7-7/8 in) or below. In the figure on the right, because the distance is
more than 0.2 m (7-7/8 in), the oil accumulates in Unit 1 when Unit 2 is in operation and Unit 1 is stopped.
Unit 1 Unit 2
Ⓐ
Unit 1 Unit 2
Ⓐ
H
H ≤ 0.2 m (7-7/8 in)
(3) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 1 when Unit 2 is in operation and Unit 1 is stopped.
Unit 2
Unit 1 Unit 1
Ⓐ
H
H ≤ 0.1 m (3-15/16 in)
(4) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 2 when Unit 1 is in operation and Unit 2 is stopped.
Unit 1 Unit 1
Unit 2
H
Ⓐ
H ≤ 0.1 m (3-15/16 in)
・The Twinning Kit must be installed horizontally using a level vessel to avoid unit damage.
Ⓑ
Ⓐ
・Restriction on installing the 2-Branch Joint Pipe between main BC and sub BC on the high-pressure piping, low-pressure piping, and liquid piping.
To main BC controller
- Regarding the 2-Branch Joint Pipe between main BC and sub BC on the high-pressure/low-pressure/liquid piping, A and B must be installed
horizontally, and C must be installed upward higher than the horizontal plane of A and B.
・If the length of the pipe between the branching point and the outdoor unit exceeds 2 m (6 ft), provide an expansion loop or an offset within 2 m (6
ft) from the branching point.
The expansion loop or offset must be at least 200 mm (7-7/8 in) in height. (high-pressure pipe only) If there is no expansion loop or offset, oil can
accumulate inside the pipe, causing a shortage of oil and may damage the compressor.
* Small dots in the figures indicate branching points.
2 m (6 ft)
To a BC controller
Ⓐ
Expansion loop or offset (high-pressure pipe only)
Ⓑ
Ⓒ High-pressure pipe
WT10508X02
Unit 1
Ⓐ
H
H > 0.2 m (7-7/8 in)
Unit 1
Ⓐ
Unit 1
Ⓐ
Ⓐ Twinning Kit
Ⓑ Level vessel
To sub BC controller
C
A
B
Ⓐ
Unit 2
Unit 2
H
H > 0.1 m (3-15/16 in)
Unit 2
H
H > 0.1 m (3-15/16 in)
To sub BC controller
Ⓑ
Ⓐ
Ⓒ
≤ 2 m (6 ft)
GB-18