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Page 12
mrcool.com
Unit Installation
Fig. 2.6
Fig. 2.7
Install an oil
return bend
every 20 ft (6 m)
Oil return bend
System gas pipe
Outdoor unit
Indoor unit
Outdoor unit
Non-return bend
System gas pipe
Oil return bend
Indoor unit
Install an oil
return bend
every 20 ft (6 m)
OIL RETURN BENDS
Add an oil return bend as described below:
If the outdoor unit is installed beneath the indoor unit, install an oil return bend every 20 ft (6 m).
A non-return bend is not needed in this configuration. Please refer to Fig. 2.6 below:
If the outdoor unit is installed above the indoor unit, install an oil return bend every 20 ft (6 m). It
is also necessary to add a non-return bend at the lowest and highest position of the vertical pipe, as
shown below in Fig. 2.7:
Use the following dimensions in Fig. 2.8 to form the oil return bend(s):
C
B
A
A (Pipe Diameter)
B C
Ф12
Ф1/2
≥26
≤150
Ф16
Ф5/8
≥33 ≤150
Ф19
Ф3/4
≥34
≥1
≥1.3
≥1.34
≥5.91
≥5.91
≥5.91
≤150
Fig. 2.8
mmInches mmInches mmInches
•
•
Non-return bend
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