Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 212

2) When connecting the drain pipe to the unit, pay sufficient 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 general purpose pipe VP-20
which can be purchased locally. When connecting, insert a
PVC pipe end securely into the drain socket before tighten-
ing securely 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 100 mm below the drain outlet of each
unit as shown in the sketch below. Use VP-30 or thicher pipe
for this purpose.
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 600 mm from the bottom of unit 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-flow 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 within the distance given in
the drawing below.
8) Avoid positioning the drain piping outlet at a place where generation of odor may stimulated. Do not lead the drain piping
direct into a sewer from where sulfur gas may generate.
a) During trial operation, make sure that drainage is properly execued and check that leakage is not found at connections.
b) Be sure to carry out a drainage test when installing the system during a heating season.
c) When installing the system in a building under construction, carry out the drainage test before ceiling tiles are in-
stalled.
1 Supply approx 1000cc of water through the outlet of the unit using a feed water pump.
2 Make sure that drainage is proceeding properly at the see-through outlet of the unit.
* Also confirm the revolving sound of the condensate motor when checking the drainage.
3 Then remove the drain plug at lower section of the unit to drain water off. After making sure water is not left,
restore the drain plug to the original position.
Indoor
unit
Drain socket
Pipe cover (small)[insulation]
(accessory)
295 ~ 325
Drain hose
Joints for VP-20
Insert a water filing hose by approx 50 mm and feed water.
(Be sure to insert the water filing hose in a downward direction.)
Remove the grommet.
Be sure to restroe it to the original
position after the test is over.
205
- -
Level difference part
Drain socket
Pipe cover (large)[insulation]
(accessory)
Drain hose
Clamp
(accessory)
(accessory)
Adhesion
Secure the elevation as high as possible
(approx. 100 mm)
A downhill grade of
VP30
1/100 or more
Unit : mm
Right above
Drain hose
Joint for VP-20
(local procurement)
VP-20
(local procurement)
Pipe cover [insulation]
(local procurement)