Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 849

2) When connecting the drain pipe to the unit, pay suffcient attention not to apply excess force to the piping on the unit side. Also,
fix the piping at a point as close as possible to the unit.
3) For drain pipe, use hard PVC ganeral purpose pipe VP-25 (I.D.1'') which can
be purchased locally. When connecting, insert a PVC pipe end securely into
the drain socket before tightening securly using the attached drain hose and
clamp. Adhesive must not be used connection of the drain socket and drain
hose (accessory).
4) When constructing drain piping for several units, position the common pipe about 100mm below the drain outlet of each unit
as shown in the sketch below. Use VP-30 or thicker pipe for this pupose.
5) Be sure to provide heat insulation to hard PVC pipes of indoor placement.
6) Do not ever provide an air vent.
7) The height of the drain head may be elevated up to a point 750mm above the ceiling and, when an obstacle exists in the ceiling
space, elevate the piping to avoid the obstacle using an elbow or corresponding gadget. When doing this, if the stretch for the
needed height is too high, the back-fiow quantity of drain at the time of interruption of the operation gets too much and it may
cause overflow at the drain pan. Therefore, make the height of the drain pipe withing the distance given in the drawing below.
8) Avoid positioning the drain piping outlet at a place where ganeration of odor may be stimulated. Do not lead the drain piping
direct into a sewer from where sulfur gas may generate.
When Using a Natural Drain Port
1) Remove the heat insulating material and rubber plug of the natural drain port.
2) By using the natural drain connecting tube (option), connect the drain pipe (VP-20) and completely clamp it with a clamp.
Note (1) If the drain pipe is directly connected to the natural drain port, the drain pan becomes unremovable.
3) Disconnect the connector CNR (blue, 2P) for the drain motor.
Pipe cover (large)[insulation]
Unit
Clamp
Drain socket
(accessory)
Pipe cover (small)[insulation]
(accessory)
Secure the elevation as high as possible
(approx. 100 mm)
A downhill grade of
1/100 or more
295~325
Drain hose (accessory)
Level difference part
Drain socket
Drain hose
Joint for VP-25
(local procurement)
(accessory
Drain hose
(local procurement)
(accessory)
Pipe cover [insulation]
Adhesion
(local procurement)
VP30
100 mm or less
Joints for VP-25 (local procurement)
FDC-HKX
VP-25
847