Mitsubishi Heavy Industries SRK63ZR-WF Technical Manual page 29

6. FORMING PIPING AND DRAIN HOSE
1. Forming piping
Piping is possible in the right, rear, downward, left, left rear or left downward direction.
NOTE
Suffi cient care must be taken not to damage
the panels when connecting pipes.
Right
Rear
Downward
Left hand side piping
Piping in the left rear direction
Piping in the left direction
7. DRAINAGE WORK
• Arrange the drain hose in a downward angle.
• Avoid the following drain piping.
The drain hose
Higher than Wavy
tip is in water.
specified
8. INSTALLING INDOOR UNIT
Installing the indoor unit to installation board
Installation board
Wall
Indoor unit base latch
9. CONNECTING PIPING WORK
1. Preparation of connecting pipe
1.1 Selecting connecting pipe
Select connecting pipe according to the following table.
Model SRK63 Model SRK71/80
Gas pipe
φ12.7
Liquid pipe
φ6.35
• Pipe wall thickness must be greater than or equal to 0.8 mm (ø15.88:1.0mm).
• Pipe material must be O-type (Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS
77.150.30).
1.2 Cutting connecting pipe
(1) Cut the connecting pipe to the required length with pipe cutter.
(2) Hold the pipe downward and remove the burrs. Make sure that no foreign material enters the pipe.
(3) Cover the connecting pipe ends with the tape.
2. Piping work
2.1 Flaring pipe
(1) Take out fl are nuts from the operation valves of indoor unit and engage them onto connecting pipes.
(2) Flare the pipes according to table and fi gure shown below.
Flare dimensions for R32 are diff erent from those for conventional refrigerant.
Although it is recommended to use the fl aring tools designed specifi cally for R32 or R410A, conven-
tional fl aring tools can also be used by adjusting the dimension B with a fl are adjustment gauge.
A
Copper pipe
A
outer diameter
9.1
φ6.35
13.2
φ9.52
16.6
φ12.7
19.7
φ15.88
2.2 Connecting pipes
(1) Connect pipes on both liquid and gas sides.
(2) Tighten nuts to specifi ed torque shown in the table below.
Operation valve size (mm) Tightening torque (N·m)
φ6.35 (1/4") 14-18
φ9.52 (3/8") 34-42
φ12.7 (1/2") 49-61
φ15.88 (5/8") 68-82
CAUTION
• Do not apply refrigerating machine oil to the fl ared surface. It can cause refrigerant leakage.
• Do not apply excess torque to the fl ared nuts. The fl ared nuts may crack resulting in refrigerant
leakage.
Left
rear
Left
Left downward
Right hand side piping
Piping in the right rear direction
Piping in the right direction
Odor from
the gutter
The gap to the ground The drain hose tip
is 5 cm or less. is in the gutter.
Base latch (2 locations)
Indoor unit
Installation board
Model SRK100
φ15.88 φ15.88
φ6.35 φ9.52
B [Rigid (clutch) type]
Copper pipe
outer diameter
R32 or R410A Conventional
φ6.35
φ9.52
0-0.5 1.0-1.5
φ12.7
φ15.88
Liquid side
Gas side
(Do not turn)
Forming of piping.
• Hold the bottom of the piping and fi x direction
before stretching it and shaping it.
Piping
Drain hose
2. Drain change procedures
(1) Remove the screw and drain hose.
(2) Remove the drain cap by hand or pliers.
(3) Insert the drain cap which was removed at procedure (2) securely using a hexagonal wrench etc.
(4) Install the drain hose and screw securely.
(1) (2)
Screw
CAUTION
Incorrect installation of drain hose and cap can cause water leakage.
• Pour water to the drain pan located under the heat exchanger, and ensure that the water is discharged outdoor.
• When extended drain hose is present inside the room, insulate it securely with heat insulator available in the market.
Since this air-conditioner is designed to collect dew drops on the rear surface to the
drain pan, do not install the connecting wire above the gutter.
CAUTION
Incorrect drainage work can cause water leakage.
(1) Pass the pipe through the hole in
the wall, and hook the upper part
of the indoor unit to the installation
board.
Removing the indoor unit from installation board
(1) Push up at the marked portion of the indoor unit base latch,
and slightly pull it toward you (both right and left hand sides).
(The indoor unit base latch can be removed from the installation
board.)
(2) Push up the indoor unit upward so that it can be removed from
installation board.
3. Heating and condensation prevention
(1) Dress the connecting pipe (both liquid and gas pipes) with insulation to prevent it from heating and dew
condensation.
Use the heat insulating material which can withstand 120 °C or higher temperature. Make sure that in-
sulation is wrapped tightly around the pipes and no gap is left between them.
(2) Wrap the refrigerant pipings of indoor unit with indoor unit heat insulation using tape.
(3) Cover the fl are-connected joints (indoor side) with the indoor unit heat insulation and wrap it with an in-
sulation pad (standard accessory provided with indoor unit).
(4) Wrap the connecting pipes, connecting cable and drain hose with the tape.
(2) (3)
Tape
Position it so that the slit area faces upward.
NOTE
Locations where relative humidity exceeds 70 %, both liquid and gas pipes need to be dressed with 20 mm or
thicker heat insulation materials.
CAUTION
• Improper insulation can cause condensate(water) formation during cooling operation.
Condensate can leak or drip causing damage to household property.
• Poor heat insulating capacity can cause pipe outer surface to reach high temperature during heating
operation. It can cause cable deterioration and personal injury.
4. Finishing work
(1) Make sure that the exterior portion of connecting pipes, connecting cable
and drain hose is wrapped properly with tape. Shape the connecting pipes
to match with the contours of the pipe assembly route.
(2) Fix the pipe assembly with the wall using clamps and screws. Pipe assem-
bly should be anchored every 1.5 m or less to isolate the vibration.
(3) Install the service cover securely. Water may enter the unit if service cover
is not installed properly, resulting in unit malfunction and failure.
WARNING (only for R32)
• To avoid the risk of fi re or explosion, the fl ared connection
must/shall be installed outdoors.
• Reusable mechanical connectors and fl ared joints are not
allowed indoors.
CAUTION
Make sure that the connecting pipes do not touch the components within the unit. If pipes touch the
internal components, it may generate abnormal sounds and/or vibrations.
28
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'22 • SRK-T-362
Taping of the exterior
• Tape only the portion that goes through the wall.
• Always tape the wiring with the piping.
(3) (4)
cap
Gutter
Wall
Pipe space
(2) Gently push the
lower part to fi x
the indoor unit
base lower latch to
installation board.
Base latch
(4)
Connecting cable
Insulation pad
Liquid pipe
Drain hose
Pipe
assembly
(h)Screw
(h)Clamp
Wall hole cover
Seal hole with putty
Indoor
unit
Flared joint outside
for indoor unit
Wall
1
1
P
a
y
(
2
H
i
l
3
O
i
4
I
p
t
l
u
1
M
(
(
(
•
•
1
I
o
S
(
(
(
Gas pipe
Tape
Insulation
1
A
A
B
B