English
7
When 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 by the angle shown
below:
Table 2
8. DRAIN PIPING WORK
CAUTION
•
Make sure all water is out before making the duct connection.
(1) Install the drain piping.
•
Make sure the drain works properly.
•
The diameter of the drain piping should be greater than or
equal to the diameter of the connecting pipe (vinyl tube; pipe
size: 20 mm; outer dimension: 26 mm).
(not including the riser)
•
Keep the drain piping short and sloping downwards at a gra-
dient of at least 1/100 to prevent air pockets from forming.
(Refer to the following picture)
CAUTION
Water accumulating in the drain piping can cause the
drain to clog.
•
To keep the drain piping from sagging, space hanging
bracket every 1 to 1.5 m.
•
Use the drain hose (2) and the metal clamp (1). Insert the
drain hose (2) fully into the drain socket and firmly tighten the
metal clamp (1) with the upper part of the tape on the hose
end. Tighten the metal clamp (1) until the screw head is less
than 4 mm from the hose.
(Refer to the following pictures)
•
The two areas below should be insulated because conden-
sation may form there causing water to leak.
•
Drain piping passing indoors
•
Drain socket
Referring the figure below, insulate the metal clamp (1) and
drain hose (2) using the included large sealing pad (5).
(Refer to the right picture below)
PRECAUTIONS
Drain piping connections
•
Do not connect the drain piping directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might enter
the indoor unit through the drain piping and corrode the heat
exchanger.
•
Do not twist or bend the drain hose (2), so that excessive
force is not applied to it.
(This type of treatment may cause leaking.)
•
If you are using central drain piping, follow the procedure
outlined in the picture depicting drain piping on this page.
•
Select central drain piping of proper size according to the
capacity of the connected unit.
CAUTION
•
The electric wiring work shall be performed by qualified elec-
tricians.
•
If workers not having the electrician qualification have per-
formed the electric wiring work, the steps 3 to 7 shall be per-
formed after the
TEST RUN
.
(2) After piping work is finished, check drainage flows
smoothly. Gradually insert approximately 1L of water
into the drain pan to check drainage in the manner
described below.
• Gradually pour approximately 1L of water from the
outlet hole into the drain pan to check drainage.
• Check the drainage.
CAUTION
When filling the drainpan with water, be sure that the
water is sliding down the drainpan wall (see picture
below). Failure to observe this instruction may result in
water leakage.
Pipe size
Further tightening angle
Recommended arm
length of tool
φ
6.4 (1/4”)
60 to 90 degrees
Approx. 150mm
φ
9.5 (3/8”)
60 to 90 degrees
Approx. 200mm
φ
12.7 (1/2”)
30 to 60 degrees
Approx. 250mm
φ
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
Connect the drain pipe after
removing the rubber cap and
insulation tubing attached to
the connection hole.
Refrigerant pipes
Drain pipe connection hole
Central drain piping
(with a slope of at least 1/100)
(accessory)
(accessory)
Metal clamp (1)
Large sealing
pad (5)
≤4mm
(accessory)
(accessory)
Tape
Drain hose (2)
Metal clamp (1)
Portable pump
Bucket
Drain pan
Air outlet
Drain outlet
Refrigerant
pipes
