DC INVERTER U-MATCH AIR CONDITIONERS INSTALLATION
Minimize the number of elbows on connection pipe.
If the connection pipe is longer than 20m, it is needed to check if the lubricating oil in the system is
enough. Add if needed.
The refrigerant charge volume inside the machine is suitable for 7m connection pipe. To extend the
length of connection pipe, it is needed to add an appropriate quantity of refrigerant. For extension of
pipe length by every 1 meter, the refrigerant to be added is as follows. The maximum allowable
length of pipe is as follows.
If the height difference between indoor and outdoor units is over 10m, it is required to install an oil
trap every 6 meters.
When the indoor and outdoor units are on different height, please refer to Fig. 30201 for pipe layout.
Liquid pipe (i.e. fine pipe)
- - - - - -Gas pipe (i.e. coarse pipe)
Figure 3-2-1
Gas pipe
Outdoor unit
Oil elbow in
gas pipe
One oil trap shall
be arranged every
4-6
m
Liquid pipe
Indoor unit
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