Electrical Wiring Work - Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual

Fixing of indoor unit
Indoor unit
Latch
1
Pass the pipe through
(2 locations)
the hole in the wall,
and hook the upper
part of the indoor unit
to the installation board.
Installation borad
2 Gently push the lower
Wall Installation
part to secure the unit.
borad
Indoor unit base lower latch
CONNECTION OF REFRIGERANT PIPINGS
Preparation
Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them.
Indoor
Press
(Do not turn)
Remove
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.
Connection Insulation of the connection portion
Liquid side Cover the coupling with insulator and then cover it with tapes.
Indoor
Gas side
Vinyl tape
(Do not turn)
Connect the pipes on both liquid and gas sides.

Tighten the nuts to the following torque.

Liquid side (ø6.35) : 14.0 - 18.0 N·m (1.4 - 1.8 kgf·m)
 Cover the indoor unit's flare-connected joints, after they are checked for a gas leak, with an indoor
Gas side (ø9.52) : 34.0 - 42.0 N·m (3.4 - 4.2 kgf·m)
unit heat insulating material and then wrap them with a tape with an attached insulation pad placed
(ø12.7) : 49.0 - 61.0 N·m (4.9 - 6.1 kgf·m)
over the heat insulating material's slit area.
Open/close and detachment/attachment of the air inlet panel
 To open, pull the panel at both ends of lower part
and release latches, then pull up the panel until
you feel resistance.
(The panel stops at approx. 60 open position)
 To close, hold the panel at both ends of lower
part to lower downward and push it slightly until
the latch works.
 To remove, pull up the panel to the position
shown in right illustration and pull it toward you.
 To install, insert the panel arm into the slot on the
front panel from the position shown in right
illustration, hold the panel at both ends of lower
part, lower it downward slowly, then push it
slightly until the latch warks.

ELECTRICAL WIRING WORK

Preparation of indoor unit
 How to remove the indoor unit from the installation board
Installation Steps
Push up at the marked portion of the indoor unit base lower latch, and slightly pull it
toward you. (both right and left hand sides) (The indoor unit base lower latch can be
removed from the installation board)
Push up the indoor unit upward. So the indoor unit will be removed from the installation
board.
The marked portion of the indoor
unit base lower latch.
CAUTION
Dimension A
Liquid side ø6.35 : 9.1 (mm) Do not apply refrigerating machine
A
Gas side ø9.52 : 13.2 (mm) oil to the flared surface.
ø12.7 : 16.6 (mm)
Use an attached insulation pad for heat insulation.
Position it so that the slit area faces upward.
CAUTION
Since this air conditioner has been designed to collect dew drops on the rear
surface to the drain pan, do not attach the power cord above the gutter.
Drainage
 Arrange the drain hose in a downward angle
 Avoid the following drain piping.
Higher than specified
 Pour water to the drain pan located under the heat exchanger, and ensure that the water is discharged outdoor.
 When the extended drain hose is indoor, always use a shield pipe (to be arranged by the user) and ensure it is
thermally insulated
 Flaring work
Clutch type flare tool for
Copper pipe diameter
Measurement B
R410A
ø6.35 0.0 - 0.5
ø9.52 0.0 - 0.5
ø12.7 0.0 - 0.5
Use a flare tool designed for R410A or a conventional flare tool.
Flaring
Please note that measurement B (protrusion from the flaring block) will vary depending on the
block
Copper pipe 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.
Finishing work and fixing
Refrigerant piping
Connection wiring,
Earth wiring
Outer tape
Drain hose
Wood screw
Clamp
How to remove and fit the front panel
 Removing
Remove the air inlet panel.
Remove the 5 set screws.
Remove the 4 latches in the upper section.
Move the lower part of the panel forward and
push upwards to remove.
 Fitting
Do remove the air filter.
Cover the body with the front panel.
Fit the 4 latches in the upper section.
Tighten the 5 set screws.
Fit the air filter.
Fit the air input panel.
RKY012A007
Gutter
Pipe accommodating section
Go through all installation steps and check if the
CAUTION
drainage is all right. Otherwise water leak may occur.
Odor from
the gutter
The drain hose Wavy The gap to the ground is The drain hose
tip is in water. 5 cm or less. tip is in the gutter.
Shield pipe
Extended drain hose
Drain hose When it is exposed indoor.
Measurement B (mm)
CAUTION
Conventional (R22) flare tool
Do not apply excess torque to the flared nuts.
Clutch type Wing nut type
Otherwise, the flared nuts may checkdepending.
1.0 - 1.5 1.5 - 2.0
1.0 - 1.5 1.5 - 2.0
1.0 - 1.5 2.0 - 2.5
Cover the exterior portion with outer tape and
shape the piping so it will match the contours
of the route that the piping to take.
Also fix the wiring and pipings to the wall with
clamps.
Set screws
Installing the air-cleaning filters
1. Open the air inlet panel and remove the air filters.
Wall
latch