Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 48 / 80

10. PIPING WORK AND REFRIGERANT CHARGE
10. Piping work and refrigerant charge
10.1 Max. pipe length allowed
Outdoor unit
Indoor unit
Pipe length E
B
C
D
Pipe length A
Height F
Height G
12K/14K/
18K
21K/24K 27K/36K 42K
Piping to each indoor unit
(A/B/C/D/E)
m ≤ 15 ≤ 20 ≤ 20 ≤ 20
Total length of piping between
all units
m A+B≤30
A+B+C≤
45
A+B+C+D
≤60
A+B+C+D
+E≤80
Max Height Between Indoor
Unit and Outdoor Unit (F)
m
≤
15
Max Height Between Indoor
Units (G)
m
≤
7.5
Model
Item
1)
To avoid storing too much oil in the oil trap, the oil trap should be as short as possible.
2)
The horizontal piping should be slope down along the refrigerant flow direction, to bring the oil
back to compressor, the slope is about 1/200 to1/250.
3)
In order to ensure cooling/h ting performance better, the refrigerant piping should be as short
and straight as possible.
Additional refrigerant charge
The unit has been filled with refrigerant, but if L (total pipe length) exceeds 15m(
12K/
14K/18K/21K/24K) /20m
(27K/36K) /25m(42K), additional charge with refrigerant (R32) is necessary.
For
12K/
14K/18K/21K/24K
Additional refrigerant charge =(L-15)
×
12g/m
For 27K/36K
Additional refrigerant charge =(L-20)
×
12g/m
For 42K
Additional refrigerant charge =(L-25)
×
12g/m
10.2 Oil trap
When the indoor unit is lower than outdoor unit and height is larger than 5m, set an oil trap every
5m (height difference) on suction piping.
NOTE:
Oil trap
Slope: 1/200~1/250
Slope: 1/200~1/250
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