Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 224

(v) Refrigerant pipng
q Use the pipes of the following material: seamless phosphorous deoxidized copper Type 1 (C1220T, JISH3300).
w Thoroughly insulate the pipes on the gas and liquid sides.
● On the gas side, the maximum temperature may reach 120 °C, so use insulating materials which can withstand this
temperature.
e The refrigerant is filled in the outdoor unit. Only fill the necessary on-site pipes with the refrigerant.
r The pipes should be bent into a curve with a radius as large as possible. It is not to be bent repeatedly.
t Use two spanners to remove the flare nuts at the end of the pipe. A fter connecting the pipe, use two spanners to tighten it.
y When attaching the flare nuts, apply freezing machine oil over the flare screw area and screw them manually for 3 to 4
turns.
i After checking for any gas leaks, cover the pipe joints with the joint insulating material provided as an accessory, and
secure the two ends with clamps.
o The unit has been tested in accordance with JIS dew point conditions to ensure trouble free operations. However, if the
unit operates at a high temperature (above the dew point temperature of 23 °C), water droplets may fall. In this case, cover
the pipes and the drain pipes further with insulating materials of 10-20 mm thickness.
!0 Do not bend or squash the pipes.
!1 Do not allow rubbish, swarf or moisture to enter the pipes when conducting plumbing work.
Pipe locations
Remote control wires and
Signal wires connection
Refrigerant gas pipe
Refrigerant liquid pipe
290
(vi) Drain piping
Operation instructions
(a) Drain piping should always be in a downhill grade (1/50~1/100) and avoid riding across and elevation or making traps.
Improper piping
Air vent
Air-filled void
(b) When connecting the drain pipe to 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.
(c) 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 tightening securely using the attached drain hose and clamp. Adhesive
must not be usedconnection of the drain socket and drain hose (accessory).
Unit : mm
415
370
275
215
Drain pipe connection
VP20 (PVC pipe)
Power supply wiring
connection
290
580
600
Avoid riding across
an elevation
Keep free from traps
Do not pipe
unde water
Downgrade
(Figure)
Piping Connect the refrigerant pipes as in the illustration below.
Insulating the pipe
See the Instructions attached to the outdoor unit for refrigerant piping.
Completely insulate both the gas pipe side and the liquid pipe side
After checking gas
leaks, cover the flared
joints of the indoor
unit with the provided
insulator and firmly
secure both ends with
the provided bands.
Good piping
1.5m~2m
Heat insulation
Adownhill grade of 1/100 or more
Please do not give a downgrade to the drainpipe as illustrated in the
drawing on the left. This will create an air-filled void and cause noise
generation upon stopping.
220
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Liquid pipe
(Indoor unit)
Gas pipe
Flare connection
Band (accessory)
Suspension bolts
Pipe cover (accessory)