Mitsubishi Heavy Industries SRK60ZSX-S 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
Sufficient care must be taken not to damage
the panels when connecting pipes.
Right
Rear
Left
Downward
rear
Left
Left 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
1. Installing the indoor unit to installation board
(1) Pass the pipe through the hole
in the wall, and hook the upper
part of the indoor unit to the
installation board.
(2) Gently push the lower part to
fix the indoor unit base lower
latch to installation board.
(3) Install the latches of the bottom panel
(7 locations).
Secure the bottom panel with the 3 screws
(in the cap).
9. CONNECTING PIPING WORK
1. Preparation of connecting pipe
1.1. Selecting connecting pipe
Select connecting pipe according to the following table.
Model SRK20/25/35
Gas pipe ø9.52
Liquid pipe ø6.35
• Pipe wall thickness must be greater than or equal to 0.8 mm.
• 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 flare nuts from the service valves of indoor unit and engage them onto connecting pipes.
(2) Flare the pipes according to table and figure shown below.
Flare dimensions for R410A are different from those for conventional refrigerant.
Although it is recommended to use the flaring tools designed specifically for R410A, conventional
flaring tools can also be used by adjusting the measurement of protrusion B with a flare adjustment
gauge.
A
Copper pipe
A 0
outer diameter
–0.4
ø6.35 9.1
ø9.52 13.2
ø12.7 16.6
2.2 Connecting pipes
(1) Connect pipes on both liquid and gas sides.
(2) Tighten nuts to specified torque shown in the table below.
Operation valve size (mm) Tightening torque (N·m)
ø6.35 (1/4") 14-18
ø9.52 (3/8") 34-42
ø12.7 (1/2") 49-61
CAUTION
• Do not apply refrigerating machine oil to the flared surface. It can cause refrigerant leakage.
• Do not apply excess torque to the flared nuts. The flared nuts may crack resulting in refrigerant
leakage.
Cut out the panel smoothly along the
line in case of side or bottom piping.
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.
Installation board
Indoor unit base latch
Wall
(2 locations)
Latch (7 locations)
Bottom panel
Model SRK50/60
ø12.7
ø6.35
Rigid (clutch) type
Copper pipe
outer diameter
R410A Conventional
ø6.35
ø9.52 0 - 0.5 1.0 - 1.5
ø12.7
Liquid side
Gas side
(Do not turn)
Forming of pipings
• Hold the bottom of the
piping and fix direction
before stretching it
and shaping it.
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.
Indoor unit
Installation board
3. Heating and condensation prevention
(1) Dress the connecting pipes (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 insu-
lation 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 flare-connected joints (indoor side) with the indoor unit heat insulation and wrap it with an
insulation 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 20mm 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 1.5m 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.
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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'17 • SRK-T-203
Pipings
Taping of the exterior
• Tape only the portion that
goes through the wall.
• Always tape the wiring
with the piping.
(3)
Drain cap
Gutter
Pipe space
2. Removing the indoor unit from installation board
(1) Remove the bottom panel. (Refer to 5.2)
(2) Pull the indoor unit base latch downward. (both right and left
hand sides). (The indoor unit base latch can be removed from the
installation board.)
(3) Push up the indoor unit upward so that it can be removed from
installation board.
Installation board
Indoor unit base latch
Wall
(2 locations)
(4)
Insulation pad Connecting cable
Liquid pipe
Drain hose
(4)
Wall
Bottom panel
Gas pipe
Tape
Insulation
Pipe
assembly
Screw
Clamp