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10. PIPING WORK AND REFRIGERANT CHARGE
Additional refrigerant charge
24K/36K: Additional refrigerant charge= (L-25) ft×0.38 oz/ft
60K: Additional refrigerant charge= (L-25) ft×0.60 oz/ft
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 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/heating performance better, the refrigerant piping should be as short
and straight as possible.
10.2 Oil trap
When the indoor unit is lower than outdoor unit and height difference 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
10. Piping work and refrigerant charge
10.1 MAX.length allowed
Pipe length L
Height difference H
Indoor unit
Outdoor unit
Model
Max. Pipe
length (L)
Max. Height
difference
(H)
Add.
Refrigerant
[exceed
25ft
7.6m]
24K
164ft. (50m)
98ft. (30m)
0.38(oz/ft)
[35(g/m)]
36K
246ft. (75m) 98ft. (30m)
0.38(oz/ft)
[35(g/m)]
60K 246ft. (75m) 98ft. (30m)
0.60(oz/ft)
[56(g/m)]
39
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