Hitachi RCD-0.8FSN3 Installation And Operation Manual page 28

DRAIN PIPING
f. Raising Drain Pipe
In case of raising the drain pipe, install it according to
the dimension shown in the figure below. The total drain
piping length of a+b+c shall be within 1100mm.
Ceiling
Hose band
a (max. 300mm)
(Accessory)
Drain hose
(Accessory)
g. Installing Common Drain Pipe
- Install the common drain pipe on a downward slope to
make sure that it is lower than each rising part of the
drain pipe from the indoor unit.
- The pipe size of the common drain pipe must be larger
than VP30 (nominal diameter 30mm, outer diameter
38mm) according to the number of the connected indoor
units.
1/25 to 1/100
Downward Slope
Common drain piping (min. VP30)
Drain piping of unit side
(Downward slope from rising part)
?
N O T E
• Do not provide an upward slope or a rising part for the drain pipe.
Otherwise, the drain water will flow back into the unit and it may
cause the water leakage when the unit operation is stopped.
Rising part
Incorrect installation of drain piping
• Do not connect the drain pipe with sanitary or sewage pipe or
any other drainage pipe.
24 PMML0425A rev.0 - 02/2016 - P5415720
1 to 1.5m
Support part
c
1/25 to 1/100
Shorter as
Down-Slope
possible
Min. 100mm
(higher as possible)
Vinyl chloride pipe (VP25)
This drain
pipe shall be
separating from
other pipes
Upward slope
5 Drainage and Water Leakage Check
After performing drain piping work and the electrical wiring
and before installing the air panel, check to ensure that
water flows smoothly according to the following procedure.
a. Drainage Operation by Float Switch
The following is regular procedure to check the float
switch operation.
i. Turn ON the power supply.
ii. Pour 1500cc to 2000cc of water gradually into the
drain pan.
iii. Check to ensure that the water flows smoothly inside
the transparent drain pipe and drained at the pipe
end, and that no water leakage occurs.
iv. If the end of the drain pipe cannot be checked
visually, pour another 1500 ~ 2000cc of water to the
drain pan. If the water overflows from the drain pan,
there might be some failure inside the drain pipe.
Recheck the drain pipe.
Vinyl tape
(White)
Position for checking drainage
Water
Pour water to the drain pan
!
D A N G E R
Be careful that water does not splash on the electrical parts
such as the fan motor, float switch or thermistors.
b. Simplified Operation of Drain-up Mechanism
The following is the simplified operation procedure of the
drain-up mechanism.
i. Turn OFF the power supply.
ii. Disconnect the service connector (marked with
green).
iii. Turn ON the power supply and start the simplified
operation of the drain-up mechanism.
iv. Turn OFF the power supply.
v. Reconnect the service connector.
Drain hose
(Accessory)
For checking drainage
(transparent)
Drain pipe connection
Access window