Drain Piping - Hitachi RCI-2.5-FSN3Ei Installation And Operation Manual

DRAIN PIPING

5 DRAIN PIPING
5.1 GENERAL
INCORRECT
Incorrect: Upward slope
Incorrect: Rising part
CORRECT
1/25 to 1/100
Down-slope
Drain piping of unit side
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C A U T I O N
• Do not create an upper-slope or rise for the drain piping, since drain
water will flow back to the unit and leakage to the room will occur
when the unit operation is stopped.
• Do not connect the drain pipe with sanitary or sewage piping or any
other drainage piping.
5.2 DRAIN PIPE CONNECTION
1 The position of the drain pipe connection is shown below.
Common drain piping
2 Prepare a polyvinyl chloride pipe with a 32mm outer
diameter.
3 Fasten the tubing to the drain hose with an adhesive and the
factory-supplied clamp. The drain piping must be performed
with a down-slope pitch of 1/25 to 1/100.
4 Do not apply excessive force to the drain pipe connection. It
could cause a damage.
5 Do not use a bent or twisted drain hose. It will cause water
leakage.
Gradient of Drain piping
6 PMML0253A rev.5 - 08/2016
Min 100mm
(higher as possible)
Vynil chloride pipe (VP25)
This drain pipe
shall be separating
from other pipes
Common drain piping (min VP30)
(Down-slope from rising part)
1/25~1/100
Down slope
• When the common drain piping is connected with other indoor units,
the connected position of each 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 unit.
• Drain piping will require insulating if the drain is installed in a location
where condensation forming on the outside of drain pipe may drop
and cause damage. The insulation for the drain pipe must be selected
to insure vapor sealing and prevent condensation forming.
• Drain trap should be installed next to indoor unit. This trap must be
designed to good practice and be checked with water (charged) and
tested for correct flow. Do not tie or clamp the drain pipe and refriger-
ant pipe together.
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N O T E
Install drainage in accordance with national and local codes.
After performing drain piping work and electrical wiring, check to
ensure that water flows smoothly as in the following procedure:

Checking with Drain-Up Mechanism and Float
Switch
- Pour approximately 1.8 liters of water into the drain pan
- Check to ensure that the water flows smoothly or whether
no water leakage occurs. When water cannot be found at
the end of the drain piping, pour another approximately
1.8 liters of water into the drain pan.
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N O T E
Pay attention to the thickness of the insulation when the left side piping is
performed. If it is too thick, piping can not be installed in the unit.
6 Insulate the drain pipe after connecting the drain hose. Do
not use adhesive between the drain pipe connection and the
drain hose.
Hose Band (Accessory)
Do not use adhesive
Drain pipe connection
Drain hose
(Accessory)
Hose band (Accessory)
Insulation (Field supplied)
Vinyl Chloride VP25
(Field Supplied)
Use Vinyl Chloride type adhesive