9
Ducted Air Conditioners
Installation Manual
Not recommended but in case of an emergency
You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may follow
the installation method below.
As you keep on tightening the flare nut with a spanner there is a point where the tightening torque suddenly
increases. From that position, further tighten the flare nut using the angle shown below in Table 3:
After the work is finished, make sure to check that there is no gas leak.
Table 3
Make absolutely sure to properly insulate the connecting pipe work and connections using field supplied
insulation after checking for gas leakage.
CAUTION
Be sure to insulate local piping all the way into the pipe connections inside the machine. Exposed piping may
cause condensation or burns on contact.
DRAIN PIPING WORK
WARNING Install the drain pipe as shown below and take measures against condensation, improperly
installed piping may result in water leaks and eventually wet furniture and belongings.
(1) Installing
•
Route the pipes so as to ensure that drainage can occur with no problems. (Fig. 10)
•
Employ piping with either the same diameter or with the diameter larger
(excluding the raised section) than that of the connecting pipe (PVC
pipe, nominal diameter 25mm, outside diameter 32mm).
•
Keep the drain pipe short and sloping downward at a gradient of
at least 1/100 to prevent air pockets from forming.
•
To prevent the drain pipe from sagging, secure the pipe every
1 to 1.5m.
•
Use the provided drain hose 2 and clamp 1 . (Fig. 11)
Tighten the clamp firmly.
•
Insulate the metal clamp with a field supplied sealing pad (Fig. 11)
•
Insulate the drain hose inside the building.
•
As a safety measure, please use a safety drain tray (field supplied) and drain separately.
•
Insulate drain pipe using piping thermal insulation to prevent condensate dripping during humid conditions.
Note
•
To ensure no excessive pressure is applied to the included drain hose 2 , do not bend or twist when
installing. (This may cause leakage).
CAUTION
Drain piping connections.
Do not connect the drain piping directly to sewage pipes. Drainage must conform to local plumbing regulations.
The vapour in the sewage might enter the indoor unit through the drain pipes and corrode the
heat exchanger or escape into the room.
Pipe size
Further tightening angle
9.5 (3/8")
60 to 90 degrees
15.9 (5/8")
30 to 60 degrees
Recommended arm length of tool
Approx. 200mm
Approx. 300mm
WRONG
CORRECT
Fig. 10
