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P
I
P
I
N
G
W
O
R
P
I
P
I
N
G
W
O
R
1
2
.
1
2
.
slope：1/200~1/250
NOTE:
1.When the indoor unit is lower than outdoor unit for more than 5m, an oil trap should be used on
suction piping.
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.
In order to ensure cooling/heating performance better, the refrigerant piping should be as short and
straight as possible.
12.3 Additional refrigerant charge
Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length.
• The additional refrigerant precharge quantity should be determined and charged into the system according to the following
procedure.
• Record the additional refrigerant quantity in order to facilitate maintenance and servicing activities.
Refrigerant charge before shipment (W
W
is the outdoor unit refrigerant charge before shipment ；
0
Xg is additional refrigerant outdoor unit needed to charge according to piping length during installation.
K
A
N
D
R
E
F
R
I
G
E
K
A
N
D
R
E
F
R
I
G
E
An oil trap should be used for every 5m
(kg))
0
R
A
N
T
C
H
A
R
G
E
R
A
N
T
C
H
A
R
G
E
slope：1/200~1/250
115
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