Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual page 219

(f) Drain pipe
Caution
● Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause flood indoors and wetting the household goods, etc.
● Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the other harmful and inflammable gas is
generated. Toxic gas would flow into the room and it would cause serious damage to userís health and safety (some poisoning
or deficiency of oxygen). In addition, it may cause corrosion of heat exchanger and bad smell.
● Connect the pipe securely to avoid water leakage from the joint.
● Insulate the pipe properly to avoid condensation drop.
● Check if the water can flow out properly from both the drain outlet on the indoor unit and the end of the drain pipe after
installation.
● Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap in the midway. In
addition, do not put air vent on the drain pipe. Check if water is drained out properly from the pipe during commissioning.
Also, keep sufficient space for inspection and maintenance.
Work procedure
1) Insert the supplied drain hose (the end made of soft PVC) to the step of the drain socket on the indoor unit and fix it securely
with the clamp.
● Do not apply adhesives on this end.
● Do not use acetone-based adhesives to connect to the drain socket.
rain socket
2) Prepare a joint for connecting VP-20 pipe, adhere and connect the joint to the drain hose
(the end made of rigid PVC), and adhere and connect VP-20 pipe (prepare on site).
* As for drain pipe, apply VP-20 made of rigid PVC which is on the market.
● Make sure that the adhesive will not get into the supplied drain hose.
It may cause the flexible part broken after the adhesive is dried up and gets rigid.
● The flexible drain hose is intended to absorb a small difference at installation of the unit or drain pipes. Intentional
bending, expanding may cause the flexible hose broken and water leakage.
3) Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap in the midway.
● Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the pipe as close place to the unit as
possible when connecting the drain pipe.
● Do not set up air vent.
nsulation material
Stage difflernce part
Unit
rain hose
Supporting metal
1.5m~2m
Descending slope greater than 1/100
VP-20
(Prepare on site)
Pipe cover (big)
(For insulation) (Accessory)
rain hose
(Accessory)
Clamp (Accessory)
(No adhesive allowed)
rain socket
Pipe cover (small)
(For insulation) (Accessory)
No bump
No trap
Air vent
211
- -
VP-25
(Prepare on site)
Joint for VP-20
(Prepare on site)
Pipe cover (For insulation)
(Prepare on site)
Trapped air will
generate noises.
Not touching the water