VESSER CGU12N, Service Instructions Manual, Page: 69 / 177

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otherwise the pipes may crack or break.
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‹ After the protective work is completed and the pipes are wrapped, use seal material to block the hole in the
wall, so as to prevent rain and wind from entering the room.
3.2 Caution in Connecting Pipes
Arrangement of connecting pipes shall be performed according to sit conditions with reference to the
following principles.
‹ Try to shorten the length of connecting pipes, within 5m for the better.
‹ Try to reduce height difference between indoor unit and outdoor unit.
‹ Try to reduce number of joint bends of connecting pipes.
‹ If the length of connecting pipes is more than 20m, adequacy of lubricant of the system must be checked;
and if necessary, add more lubricant properly.
‹
Filling amount of refrigerant in the system is matched to a 7m connecting pipe. If the connecting pipe is
needed to lengthen, appropriate amount of refrigerant should be added. How much refrigerant should be
added for every meter extension refers to the following table. Allowable maximum pipe length is 30m.
‹ If height difference between indoor unit and outdoor unit exceeds 10m in installation of air conditioner, an
oil return bend must be mounted at an interval of 6m.
‹ If heights of indoor unit and outdoor unit are different, pipes should be laid out with reference to Figure 3-2-
1.
Refrigerant pipe (thin)
- - - - - - Air pipe (large)
Outdoor unit
Air pipe
Oil loop of air pipe
Refrigerant pipes
Oil loop of air pipe
An oil loop is arranged
at an interval of 4-6m.
Indoor unit
Figure 3-2-1