Pipe Installation - Fujitsu KHT Series Installation Manual

Drain hose insulation
(Accessory)
Indoor unit
Drain hose
100 mm
■ When drain pump is used
Locally arranged pipe
GOOD
PROHIBITED
Observe the following procedures to construct centralized drain pipe
fittings.
VP30 or more [O.D 38 mm or more]
700 mm or less
■ When drain pump is not used (Natural drainage)
If the drain pump is not used, please move the position of the drain cap and insulation.
NOTE:
• Install the drain pipe with downward gradient (1/50 to 1/100) and so there are no rises or
traps in the pipe.
En-8
Hose band (Accessory)
Drain hose insulation
(Accessory)
Overlap the heat insulation.
Gap of 1.5 to 2 m
VP25 [O.D
Max.
300 mm
32 mm or more]
700 mm or
less
Horizontal or
upward gradient
Rise
Air bleeding
Trap
Downward gradient 1/100 or more
GOOD
Outlet
airflow
Arrange the drain pipe
lower than this portion
Supporter
3. 5. 2. Check for drainage
Pour about 1 liter of water from the position shown in the diagram or from the airflow outlet
to the dew tray. Check for any abnormalities such as strange noises and whether the drain
pump functions normally.
Make sure the drain water is properly drained.

3. 6. Pipe installation

• During installation, make sure that the refrigerant pipe is attached firmly before you
run the compressor.
Do not operate the compressor under the condition of refrigerant piping not attached
properly with 2-way or 3-way valve open. This may cause abnormal pressure in the
refrigeration cycle that leads to breakage and even injury.
• During the pump-down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.
• When installing and relocating the air conditioner, do not mix gases other than the
specified refrigerant (R32) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to
an abnormally high value and cause breakage, injury, etc.
• If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant
comes in contact with a flame, it produces a toxic gas.
• Be more careful so that foreign matter (oil, water, etc.) does not enter the piping than
with refrigerant R32 models. Also, when storing the piping, securely seal the openings
by pinching, taping, etc.
• While brazing the pipes, be sure to blow dry nitrogen gas through them.
• When the pipe is long, install supporters.
Drain
pipe
PROHIBITED
Rise
Trap
CAUTION
WARNING
CAUTION
Supporter
1.5 to 2 m
Air bleeding