Connection Of Refrigerant Pipings - Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual

Fixing of indoor unit
Latch (2 locations)
Indoor unit
Installation board
Wall
Installation board
Indoor unit base 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.
• Flaring work
Copper pipe diameter Clutch type flare tool for
Measurement B
R410A
ø 6 .35 0.0 - 0.5
ø 9 .52 0.0 - 0.5
ø 1 2.7 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 conventional 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.
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 works.
• How to remove the indoor unit from the installation board
Installation Steps
1 Pass the pipe through
1
Push up at the marked portion of the indoor unit base lower latch, and slightly
the hole in the wall,
pull it toward you. (both right and left hand sides) (The indoor unit base lower
and hook the upper
latch can be removed from the installation board)
part of the indoor unit
2
Push up the indoor unit upward. So the indoor unit will be removed from the
to the installation board.
installation board.
2 Gently push the lower
part to secure the unit.
The marked portion of the indoor unit base lower latch.
CAUTION
Dimension A
Do not apply refrigerating machine
Liquid side ø 6 .35 : 9.1 (mm)
A
oil to the flared surface.
Gas side ø 9 .52 : 13.2 (mm)
ø 1 2.7 : 16.6 (mm)
Measurement B (mm)
Conventional (R22) flare tool
Clutch type Wing nut type
1.0 - 1.5 1.5 - 2.0
1.0 - 1.5 1.5 - 2.0
1.0 - 1.5 2.0 - 2.5
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.
Connection Insulation of the connection portion
Cover the coupling with insulator and then cover it with tapes.
Indoor Liquid side
Gas side
(Do not turn)
Connect the pipes on both liquid and gas sides.
Tighten the nuts to the following torque.
Liquid side (ø 6 .35) : 14.0 - 18.0 N·m (1.4 - 1.8 kgf·m)
Gas side (ø 9 .52) : 34.0 - 42.0 N·m (3.4 - 4.2 kgf·m) • Cover the indoor unit s flare-connected joints, after they are checked for a gas leak,
(ø 1 2.7) : 49.0 - 61.0 N·m (4.9 - 6.1 kgf·m) with an indoor unit heat insulating material and then wrap them with a tape with an
attached insulation pad placed over the heat insulating material's slit area.
CAUTION
Do not apply excess torque to the flared nuts. Finishing work and fixing
Otherwise, the flared nuts may check depending.
How to remove and fit the front panel
Removing
1 Remove the air inlet panel.
2 Remove the 2 set screws.
3 Remove the 3 latches in the upper section.
4 Move the lower part of the panel forward and
push upwards to remove.
Fitting
1 Do remove the air filter.
2 Cover the body with the front panel.
3 Fit the 3 latches in the upper section.
4 Tighten the 2 set screws.
5 Fit the air filter.
6 Fit the air inlet panel.
Gutter
Wall
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
Drain hose Extended drain hose
When it is exposed indoor.
Vinyl tape
Use an attached insulation pad for heat insulation.
Position it so that the slit area faces upward.
Refrigerant piping
Connection wiring, Cover the exterior portion with outer tape and
Earth wiring
shape the piping so it will match the contours
Outer tape of the route that the piping to take.
Drain hose Also fix the wiring and pipings to the wall with
clamps.
Wood screw
Clamp
Set screws