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Refrigerant piping
Connection
Note on Pipe Length
When connecting refrigerant piping, do not let substances or gases other than the specied
refrigerant enter the unit. The presence of other gases or substances will lower the unit’s capacity,
and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and
injury.
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height
between the indoor and outdoor units meets the requirements shown in the following table :
The Maximum Length And Drop Height Based on Models. (Unit: m/ft.)
Type of model Capacity (Btu/h) Length of piping Maximum drop height
EU frequency
conversion Split
Type
<15K 25/82 10/32.8
15K - <24K 30/98.4 20/65.6
24K - <36K 50/164 25/82
36K - 60K 65/213 30/98.4
Other Split Type
12K 15/49 8/26
18K-24K 25/82 15/49
30K-36K 30/98.4 20/65.6
42K-60K 50/164 30/98.4
Refrigerant Piping Connection
Oil traps
CAUTION
If oil flows back into the outdoor unit’s
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can prevent
this.
An oil trap should be installed every 6m(20ft)
of vertical suction line riser
(36000Btu/h unit).
An oil trap should be installed every
10m(32.8ft) of vertical suction line riser
(≥36000Btu/h unit).
10m/32.8ft
(≥36000Btu/h unit)
6m/20ft
(36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
6m/20ft
(36000Btu/h unit)
Indoor unit/
Outdoor unit
Indoor unit/
Outdoor unit
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