Climate 5000 SCI – 6720887405 (2018/04) 15
Refrigerant Piping Connection
X
X
Indoor
Indoor Outdoor
Liquid side
Liquid side
Liquid side
Outdoor
Outdoor
Indoor
Fig. 25.
CAUTION
• Oil traps
If the indoor unit is installed higher than the outdoor unit:
- 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 10 m of vertical suction line
riser. (See Fig. 26)
Gas piping
Indoor unit
Outdoor unit
Oil trap
Liquid piping
10 m
10 m
Fig. 26.
The indoor unit is installed higher than the outdoor unit
CAUTION
If the outdoor unit is installed higher than the indoor unit:
-It is recommended that vertical suction risers not be upsized.
Proper oil return to the compressor should be maintained with
suction gas velocity. If velocities drop below 7.62 m/s, the oil return
will be decreased. An oil trap should be installed every 6 m of vertical
suction line riser. (See Fig. 27)
Gas piping
Indoor unit
Outdoor unit
Oil trap
Liquid piping
6 m
6 m
Fig. 27.
The outdoor unit is installed higher than the indoor unit
Permitted length
Piping
length
Total piping
length
18K+18K 30 L+Max
(L1, L2)
24K+24K
30K+30K
50
(farthest dis-
tance from the
line pipe branch)
15 L1, L2
(farthest dis-
tance from the
line pipe branch)
10 L1-L2
Drop
height
Drop height
between indoor
and outdoor unit
20 H1
Drop height
between two
indoor units
0.5 H2
Table 7.
7.2 Refrigerant Piping Connection Instructions
CAUTION
• The branching pipe must be installed horizontally. An angle of more
than 10° may cause malfunction.
• DO NOT install the connecting pipe until both indoor and outdoor
units have been installed.
• Insulate both the gas and liquid piping to prevent water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take extra care to cut and flare them
correctly. This will ensure efficient operation and minimize the need for
future maintenance.
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