Refrigerant Piping Connection
Refrigerant piping
Connection
Page 29
Note on Pipe Length
When connecting refrigerant piping,
do not
let substances or gases other than the specified
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
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
