Mitsubishi Heavy Industries SRK20ZIX-S Service Manual page 56

CAUTION
Fixing of indoor unit
During the installation, do not lean on the control box or the display, as they may be damaged.
Floor installation
Secure using lower 2 screws for floor installations.
If possible, also attach two upper screws.
If there is an obstacle such as a cable cover,
cut off the hatched part before installation.
CONNECTION OF REFRIGERANT PIPINGS
Preparation Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc.
from entering them.
Indoor (Do not turn)
A
Remove
Press
Remove the flared nuts. (on both liquid and gas sides) Install the removed flared nuts to the pipes to
 
be connected,then flared the pipes.
CAUTION
Do not apply refrigerating machine oil to the flared surface.
 Flaring work
Clutch type flare tool for
Measurement B Copper pipe diameter
R410A
ø6.35 0.0 - 0.5
ø9.52 0.0 - 0.5
ø12.7 0.0 - 0.5
Flaring
Use a flare tool designed for R410A or a conventional flare tool.
block
Please note that measurement B (protrusion from the flaring block) will vary depending
Copper pipe
on the type of a flare tool in use.
If a coventional flare tool is used, please use a copper pipe gauge or a similar
instrument to check protrusion so that you can keep measurement B to a correct value.
ELECTRICAL WIRING WORK
Preparation of indoor unit
Mounting of connecting wires
1 Remove the fixing screw of clamp.
2 Connect the connecting wire securely to the terminal block.
1 ) Connect the connection wire securely to the terminal
block. If the wire is not affixed completely, contact will be
poor, and it is dangerous as the terminal block may heat
up and catch fire.
2 ) Take care not to confuse the terminal numbers for indoor
and outdoor connections.
3 Fix the connecting wire by wiring clamp.
4 Pass the connecting wire through the wiring holder.
Concealed installation
Install the indoor unit according to the following instructions.
1 Secure the upper, right, and left spaces according to the right figure.
Wall installation
At first secure the installation board using 5 screws and the indoor unit using 2 screws.
Installation of Installation board
Look for the inside wall structures (Intersediats
support or pillar and finally install the unit after level
surface has been checked.)
Fixing on concrete wall
Use of nut anchor
Bolt
(M6 12)
Installation
board
CAUTION
Be careful not to stress the connecting refrigerant pipes.
Connection
Indoor
Liquid side
Dimension A
Gas side
Liquid side ø6.35:9.1(mm)
Gas side ø9.52:13.2(mm)
ø12.7:16.6(mm)
CAUTION
Do not apply excess torque to the flared nuts. Otherwise, the flared nuts may check depending.
Insulation of the connection portion
Pass the refrigerant pipe through the piping hole to
Measurement B (mm)
indoor side.
Conventional (R22) flare tool
Arrange the pipes according to the direction of piping.
Clutch type Wing nut type
1.0 - 1.5 1.5 - 2.0
1.0 - 1.5 1.5 - 2.0
155
105
1.0 - 1.5 2.0 - 2.5
45
130
140
CAUTION

During installation, do not lean on the control box or the display, as they
may be damaged.
CAUTION
 Pass the connecting wire securely through the wiring holder. If it passes
In case of faulty wiring connection, the indoor unit
on the sensor, it may not detect suction temperature and/or humidity.
stops, and then the run lamp turns on and the timer
lamp blinks.
Use cables for interconnection wiring to avoid
loosening of the wires.
CENELEC code for cables Required field cables.
H05RNR4G1.5 (example) or 245IEC57
H Harmonized cable type
05 300/500 volts
R Natural-and/or synth, rubber wire insulation
N Polychloroprene rubber conductors insulation
R Stranded core
4or5 Number of conductors
G One conductor of the cable is the earth
conductor (yellow/green)
1.5 Section of copper wire (mm )
2
Tapping screw
Adjustment of the installation board in the horizontal

Standard hole
direction is to be conducted with five screws in a temporary
tightened state.
Adjust so the board will be level by turning the board with

the standard hole as the center.
Connect the pipes on both liquid and gas sides.

(Do not turn)
Tighten the nuts to the following torque.

Liquid side (ø6.35) : 14.0 - 18.0 N·m (1.4 - 1.8 kgf·m)
Gas side (ø9.52) : 34.0 - 42.0 N·m (3.4 - 4.2 kgf·m)
(ø12.7) : 49.0 - 61.0 N·m (4.9 - 6.1 kgf·m)
Cover the coupling with insulator and then cover it with tapes.
Use an attached pipe cover for heat insulation.
Refrigerant
Refrigerant
pipe
pipe
Slit Slit
Tape
Position it so that the slit area faces upward.
Terminal block
Clamp
Fixing screw Wiring holder
Sensor
Finishing work and fixing
Refrigerant piping
Connection wiring,
Cover the exterior portion with outer tape
Earth wiring
and shape the piping so it will match the
Outer tape
contours of the route that the piping to take.
Also fix the wiring and pipings to the wall
Drain hose
with clamps.
Wood screw
Clamp
CAUTION
If heat insulation is insufficient, water leakage
may occur. In addition, the room temperature
sensor may give a false alert due to heat
Refrigerant
radiation from the pipes.
pipe
 Cover the indoor unit's flare-connected joints, after
they are checked for a gas leak, with an indoor unit
⑨Pipe cover
Add
heat insulating material and then wrap them with a
⑩band
tape with an attached pipe cover placed over the
heat insulating material's slit area.
How to fit the front panel
 Fitting
1 Do remove the air filter.
2 Cover the body with the front panel.
3 Fit the 6 latches in the lower section.
then 3 latches in the upper section.
4 Tighten the 5 set screws.
5 Fit the air filter.
6 Fit the air inlet panel.
Close and attachment of the air inler panel
Latch
 To close, attach the panel after pulling
the strings, hold the panel at both ends of
upper part to lower downward and push it
slightly until the latch works.
Installing the air-cleaning filters
1. Open the air inlet panel and remove the air filters.
2. Install the filter holders, with the air-cleaning filters installed in the holders.
In the air conditioner.
Latch