Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 225

Do not use acetone-based adhesives to connect to the drain socket.
Stage difflernce part
Drain socket
(d) When constructing drain piping for several units, position the common pope about 100mm below the drain outlet of each
unit as shown in the sketch. Use VP-30 (11/4") or thicker pipe for this purpose.
(e) Be sure to provide heat insulation to hard PVC pipes of indoor placement.
(f) Do not ever provide an air vent.
(g) You can elevate the drain outlet up to 600mm from the indoor unit's lower face. 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 higher than 600mm, the back-flow quantity of drain at the event 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 sketch below.
(h) Avoid positioning the drain piping outlet at a place where generation of odor may be stimulated. Do not lead the drain
piping direct into a sewer from where sulfur gas may generate.
Secure the elevation as high as possible
(approx. 100mm)
A downhill grade of
1/100 or more
Drainage test
q Conduct a drainage test after completion of the electrical work.
w During the trial, make sure that drain flows properly through the piping and that no water leaks from connections.
e In case of a new building, conduct the test before it is furnished with the ceiling.
r Be sure to conduct this test even when the unit is installed in the heating season.
Procedures
q Supply about 1000 cc of water to the unit through the air outlet by using a feed water pump.
w Check the drain while cooling operation.
Pour water in the drain pan with a siphon.
drain pan
Pouring water hose
Remove this pipe bracket from the unit.
Main
unit
Drain hose
Drain socket
Drain hose
VP30
Attached drain hose clamp
221
-
Pipe cover (large) [for insulation]
(accessory)
VP20 joint (field purchased)
Drain hose
Ashesion
(accessory)
Clamp (accessory)
Pipe cover (small)
[for insulation] (accessory)
290~325mm
Joint for VP20 (local procurement)
Drain
Main
piping
unit
Drain situation can be cheked with transparent socket.
If the electrical work has not been completed, connect a convex
joint in the drain pipe connection to provide a water inlet.
Then, check if water leaks from the piping system and that drain
flows through the drain pipe normally.
-
VP20 (field purchased)
Pipe cover [for insulation]
(field purchased)
Right overhead
Pour water into a convex joint