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the wall, so as to prevent rain and wind from entering the room.
8.5.10 Connecting pipe
1. Match the flaring of copper pipe to the center of screwed connection, and then screw the flared nut up by
hands.
2. Screw flaring nut with torque wrench until the spanner clatters, which is shown in the figure below.
3. Use adhesive tape to wrap the pipes:
① Use adhesive tape to bundle the connecting pipe and the cables together. To
prevent condensate from overflowing out from the drainage pipe, separate the drainage
pipe firm the connecting pipe and the cables.
② Use thermal insulation tape to wrap the pipes from the bottom of the outdoor
unit until the upper end of the pipe where the pipe enters the wall. When wrapping
thermal insulation tape, the later circle of tape must cover half of the front circle of
tape Refer to the figure on right.
③ Wrapped pipe must be fixed to wall using pipe clamps.
8.5.11 Cautions in Connecting Pipes
The layout of connecting pipeline shall comply with the following principles according to actual situation.
1. The length of connecting pipe shall be short as much as possible and it is better to restrain the length
within 5m.
2. Shorten the height difference between indoor and outdoor unit as much as possible.
3. Reduce the height difference between indoor and outdoor units as it might be.
4. Lessen the quantity of elbows as much as possible.
5. When the length of connecting pipe exceeds 20m, check if the lubricant of the system is enough. If not,
add some in the oil trap properly.
6. Refrigerants volume inside the outdoor unit suit for connecting pipe with 7m. If connecting pipe shall be
prolonged, refrigerants shall be added accordingly. Every 1m prolonged, the added volume of refrigerant can
refer to Table 3. The allowable max length of pipe can be also found in the table.
7. When installing the unit, if difference in height between indoor and outdoor unit exceeds 10m, one oil
DC Inverter Cassette Type Air Conditioner Installation and Operation Manual
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