Service manual

8. The unit must be tested by professional technicians or the user’s people with air conditioner
knowledge under the instructions of Sinclair’s professional technicians.
9. Before installing the indoor and outdoor connecting pipe, do not remove the plug sealing the pipe.
10. To prevent dust or moisture entering into the system, connect the pipe quickly after removing the
seal plug.
11. The pipe must be installed in a wall-cross tube when passing the wall.
12. The shorter the connecting pipe, the better. The smaller the height difference between indoor unit
and outdoor unit, the better. The fewer the pipe bends, the better. The bending radius shall be as
large as possible.
13. When laying the pipes along the designated route, do not flatten the pipe. The bending radius must
be over 200MM. The connecting pipe shall not frequently bent or stretched; otherwise it will become
hardened. One pipe shall not be bent at the same position over 3 times the maximum.
11.6 Precautions on Installation of Outdoor Condensate Pipe
It is usually found that the condensate water of duct type air conditioner cannot be drained out. Through
our investigation and analysis, it is the relative high-speed air flow generated under negative pressure
inside the unit that obstacles the normal drain of condensate water. Therefore, we need to install a
section of water seal at the drainage outlet.
As shown in Fig. 11-24, the height of water seal depends on the pressure inside the section where the
condensate pipe is located.
When the section of condensate pipe is under negative pressure, h=x
≥
10
P
+20(mm)
When the section of condensate pipe is under positive pressure, x
≥30mm，h≥
10
P
+20(mm)
In which: P – Absolute pressure of this section inside the equipment, Pa
。
Fig. 11-24 Indoor Water Seal Sketch
Note: 1. “h” shall be less than 50mm the minimum.
2. The condensate pipe shall be heat insulated.
3. The condensate pipe shall be kept an inclination ５～１０° for easier drain of the
condensate water. To avoid condensing dew, the connector of condensate pipe shall be
heat insulated.
接冷凝水管
To condensate pipe
Nnit
105