Drain Piping - Hitachi RCI-1.0FSN3 Installation & Maintenance Manual

6.

Drain Piping

Perform the drain piping work and attaching the
insulations before the refrigerant piping work.
Do not insert the drain pipe for the indoor unit
to the drainage trench where corrosive gases
that may cause the poisoning.
Do not create an upper-slope or rise for the drain
indoor unit and leakage into the room will occur
when the system operation is stopped.
Do not connect the drain pipe with sanitary or
sewage piping or any other drainage piping.
When the common drain piping is connected with
indoor unit must be higher than the common
piping. The pipe size of the common drain pipe
must be large enough according to the unit size
and number of units.
After performing drain piping work and electrical
as in the following procedure.
(1) The position of the drain pipe connection is
shown in Fig. 6.1.
(mm)
Drain Pipe Connection
Fig. 6.1 Position of Drain Pipe Connection
(2) Prepare a polyvinyl chloride pipe with a
32mm outer diameter. (VP25 (based on JIS
K6741) is recommended.)
P5414946-rev.1
TC-12001
(3) Connecting Drain Piping
(a) Connect the factory-supplied drain hose
(b)
Drain Pipe
Connection
(c) Tighten the factory-supplied hose clamp
82
Hose Band (Accessory)
Tightening Torque:
3.0 - 3.5N.m
Drain Pipe Connection
for Checking Drainage
(Transparent)
to the drain pipe connection with the
polyvinyl chloride adhesive. Perform
retaining and curing according to the
adhesive manufacturer information.
The adhesive Eslon No.73 (Sekisui
Chemical Co. Ltd) is recommended.
Drain Hose
(Accessory)
(Correct)
Twisted
Incompletely Insertion
(Incorrect)
Twisted, incompletely insertion.
Fig. 6.2 Insertion of Drain Hose
at the vinyl tape (white) of the drain hose
(20mm from the end face of the drain
hose) until approximately 28mm of the
length from the top of the screw to the
bottom of hose clamp as shown in Fig. 6.3.
Elbow or Vinyl Chloride VP25
(Field-Supplied)
Drain Hose
Vinyl Tape
(Accessory)
20 + 5mm
Max. 300mm
Use Vinyl Chloride
Type Adhesive
Tightening Torque: 3.0 - 3.5N.m
Fig. 6.3 Drain Hose Connection
4-WAY CASSETTE
Drain Hose
(Accessory)
17
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