Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 502

FDKN-H
(e) Installation of unit
• To remove the unit from the
mounting plate, remove the
right and left lids then remove
the claw at the lower portion
of base.
(4) Refrigerant piping
(a) Comply the following table for the tightening torque of the flared nut and flange bolt.
Flared nut tightening torque
φ6.35: 16 to 20 (N-m), (1.6 to 2.0 kg-m)
φ9.52: 40 to 50 (N-m), (4 to 5 kg-m)
φ15.88: 90 to 120 (N-m), (9 to 12 kg-m)
Wrap the gaseous refrigerant piping and liquid refrigerant piping with thermal insulator perfectly.
(b) In the case of liquid refrigerant piping, if it is not insulated, dew condensation and water leakage may occur.
(c) When removing the flared nut at the piping end of unit, always use 2 of spanners, and when
connecting the pipe tighten it firmly using 2 of spanners.
(d) When connecting the flared nut, apply refrigerating machine oil on the back surface of flare
and screw-in the nut for the first 3 to 4 turns by hand.
(e) Use the pipe made of the following material. It is very convenient to use the separately sold
piping kit.
Material: Phosphor deoxidized seamless copper tube (C1220T,JIS H3300)
(f) Cover the connection part with indoor unit insulation material and insulate the notched part
with attached insulation and then wrap it up with tape.
(5) Drain piping
(a) Lay the drain piping with downgrade to facilitate flow of drain,and do not make a trap or chevron-shaped bend. (The drain
piping can be taken out from the unit to the left, right, rear and down direction.)
Wrap the thermal insulator on the hard vinyl chloride pipe (VP-16) laid in the room.
(b) Pour water into the drain pan below the heat exchanger to
check that water is drained outdoors.
CAUTION
The drainage work must be performed surely and the
drainage must be checked. If drainage is not perfect, it
causes water leakage.
(6) Fixing of wiring
(a) Remove the front panel.
(b) Connect the wire from the indoor and outdoor units to the terminal table of control box.
(c) Attach the front panel.
Notes (1) Refer to the illustration below for the removal and attaching of the front panel.
(2) Before connecting the wiring to the terminal table, confirm the terminal number.
500
Lid (right hand)
Mounting plate
Wall
Claw at the lower portion of indoor unit base.
Claw (2 places)
(FDKN308: 3 places)
Indoor unit
Mounting plate
(1) Hang the upper portion of in-
(2) The indoor unit can be fixed
No chevron-shaped bend is allowed.
No trap is allowed.
Illustration showing the end of drain hose
The end shall
not be sub-
merged in wa-
ter.
Hard vinyl chloride pipe (general-purpose
pipe VP-16) can be connected.
Installation work procedure
door unit on the mounting plate.
with one action by pushing its
lower portion slightly.
Vinyl tape
Insulate with attached in-
sulation.
Arrange so that the
cut portion is lo-
cated upper side.