Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 855

Check of levelness
Check the levelness as follows. Use a level gauge or adjust the levelness with the following method.
2) Drain pipe
a) Set the drain pipe as a declining gradient (1/50 ~ 1/100) and avoid to cross an over-hand ridge or to allow a trap on the way.
● Good piping
Support fixture
Declining gradient
1/100 or more
Insulation
materials
b) When connecting the drain pipe, avoid undue stress being applied to the pipe at the unit side and fix the pipe at a point as close
as possible to the unit.
c) A hard vinyl chloride pipe, general VP-25, which is available from markets is ideal for the drain pipe.
d) When installing the drain pipe, make sure to use the attached drain pipe, drain pipe clamp, and insulation materials for drain
pipe clamp.
● Insert the drain pipe to the base of outlet.
● Securely tighten the drain pipe clamp.
● Make sure to insulate the drain pipe clamp.
e) When there are plural number of drain pipes, arrange to position the converging pipe at about 100mm below the drain outlet
as shown below. Use a pipe of VP-30 or higher for the converging pipe.
f) Make sure to provide the thermal insulation for the hard vinyl chloride pipe and drain socket provided indoor.
g) Air bleed should not be provided in any event.
● When it is necessary to raise the drain head, the limitation is up to 600mm below the bottom face of ceiling where the unit
is installed. The distance is the dimension of the pipe which is installed perpendicularly from a point close to the output for
drain pipe connection.
Adjust the bottom of main unit
and the water level as shown
below.
1.5m~2m
Should be as high as possible.
(Approx. 100 mm)
Declining gradient 1/100 or more
295~325
Piping side
Water injection
Water level
0~3 mm
Slightly lower the piping side
● Improper piping
Air bleed
VP-30
FDC-HKX
Vinyl pipe
Crossing
over-hang ridge
Trap
853