Drain Piping - Hitachi Rcd-0.8Fsr Installations- Und Betriebshandbuch

DRAIN PIPING

14 DRAIN PIPING
Perform drain piping work and attach the insulations before
refrigerant piping work.
!
D A N G E R
Do not put the drain pipe for the indoor unit into the drainage trench
where corrosive gases occur. Otherwise, poisonous gases flow into
the room, which may cause poisoning.
1 The position of the drain pipe connection is shown in the
following figure:
Drain pipe connection
(Polyvinyl chloride pipe/VP25)
Air panel (Option)
2 Prepare a polyvinyl chloride pipe with a 32mm outer
diameter for drain piping [VP25 (based on JIS K6741) is
recommended].
3 Connecting Drain Pipe
a. Connect the factory-supplied drain hose to the drain
pipe connection with the polyvinyl chloride adhesive.
When cleaning the connection surface, applying the
adhesive, inserting, retaining and curing the pipe, refer
to information given by the adhesive manufacturer. The
adhesive Eslon Nº 73 (Sekisui Chemical Co. Ltd) is
recommended.
b. Insert the drain hose completely. If it is not inserted
properly, or if it is twisted, water leakage may occur.
Drain pipe
connection
Insert completely and properly
Twisted, incompletely insertion
23
PMML0549 rev.1 - 02/2021 - A10761230A
65 (mm)
Drain pipe
359
Drain hose
(Accessory)
Correct
Incorrect
c. Attach the factory-supplied hose clamp to the vinyl tape
(white) attached to the drain hose. The hose clamp
shall be 20mm away from the end face of the drain
hose. Then tighten the hose clamp to make sure that it
is approximately 28mm in length from the screw to the
edge of the hose clamp as shown in the following figure.
Hose band (accessory)
Tightening torque: 3.0-3.5N.m
Vinyl tape (white)
Drain pipe connection
For checking drainage
(transparent)
Tightening torque: 3.0-3.5N.m
?
N O T E
• If connecting the factory-supplied drain hose to the drain pipe
connection without adhesive, for future relocation, follow the
procedure (b) and (c).
• Use the factory-supplied drain hose and the hose clamp. Others
may cause water leakage.
• Do not bend or twist the factory supplied drain hose. It will cause
water leakage.
• Do not apply an excessive force to the drain pipe connection. It
could cause a damage.
4 On-site Drain Piping Work
a. Connect the factory-supplied drain hose to the drain pipe
connection using the polyvinyl chloride adhesive.
b. When cleaning the connection surface, applying the
adhesive, inserting, retaining and curing the drain pipe,
refer to information given by the adhesive manufacturer.
c. The drain piping shall be installed on a downward slope
of 1/25 to 1/100 as shown in the figure below.
d. Install the support parts at an interval of 1m to 1.5m in
order not to bend the drain pipe.
e. Install the drain hose horizontally or slightly on an upward
slope to prevent air pockets from forming inside it. If air
pockets form, the drain water will flow back into the unit,
which could cause an abnormal noise and leakage to the
room when the unit operation is stopped.
Drain hose
Install the drain hose horizontally or
with an upward slope
Elbow or Vinyl chloride VP25
(Field-supplied)
Drain hose (accessory)
20+5mm
Use vinyl chloride
type adhesive
Min.
28mm