Page 1
85264189993000 © SANYO 2006
In Canada
SANYO FISHER COMPANY SANYO Canada Inc.
A DIVISION OF SANYO NORTH AMERICA CORPORATION 300 Applewood Crescent, Concord
21605 Plummer Street Ontario, L4K 5C7, Canada
Chatsworth, CA 91311 U.S.A.
Contents
Page
IMPORTANT!
Please Read Before Starting .................................. 2
1. GENERAL .......................................................... 3
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation
2. INSTALLATION SITE SELECTION ................... 4
2-1. Indoor Unit
2-2. Connecting Indoor Units
2-3. Outdoor Unit
2-4. Outer Dimensions of Outdoor Unit
2-5. Diagram of Outdoor Unit Installation
3. INSTALLATION PROCESS .............................. 13
3-1. Embedding the Tubing and Wiring
3-2. Use of the Flaring Method
3-3. Flaring Procedure with a Flare Tool
3-4. Caution before Connecting Tubes Tightly
3-5. Tubing Connections
3-6. Insulation of Refrigerant Tubing
3-7. Taping the Tubes
3-8. Finishing the Installation
4. AIR PURGING................................................... 16
I Air Purging with a Vacuum Pump (for Test Run)
I Pump Down
5. WIRING INSTRUCTIONS ................................ 19
5-1. General Precautions on Wiring
5-2. Recommended Wire Length and Diameter
5-3. Wiring System Diagram
5-4. How to Connect Wiring to the Terminal
5-5. Wiring Instructions for the Outdoor Unit
6. TEST RUN......................................................... 23
7. CONNECTING A HOME AUTOMATION
DEVICE ............................................................. 24
8. INSTALLATION CHECK SHEET ...................... 24
INSTALLATION INSTRUCTIONS
Model Combinations
Combine indoor and outdoor units only as listed
below.
Indoor Unit Outdoor Unit
KMHS0772 CMH1972
KMHS0972 CMH2472
KMHS1272 CMH3172
KMHS1872
KMHS2472
Combine indoor and outdoor units only as listed in
the combination tables for 3-room or 4-room
outdoor unit as shown in its respective manual.
Power Source:
60 Hz, single-phase, 230 / 208 VAC
– Inverter Multi Split System Air Conditioner –
COOL/DRY/HEAT Model
This air conditioner uses the new refrigerant R410A.
Be sure to read the yellow instruction sheet
attached to the outdoor unit for models using the
new refrigerant R410A.
The illustrations are based on the typical appearance of
a standard model. Consequently, the shape may differ
from that of the air conditioner that you are installing.
NOTE
Indoor unit A
Indoor unit B
Indoor unit C
Indoor unit D
Outdoor unit
Combination example
For Outdoor Unit
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page a
Page 2
2
IMPORTANT!
Please Read Before Starting
This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and efficiently.
For safe installation and trouble-free operation, you
must:
G
Carefully read this instruction booklet before beginning.
G
Follow each installation or repair step exactly as shown.
G
Observe all local, state, and national electrical codes.
G
Pay close attention to all warning and caution notices
given in this manual.
This symbol refers to a hazard
or unsafe practice which can
result in severe personal injury
or death.
This symbol refers to a hazard
or unsafe practice which can
result in personal injury or product or property damage.
If Necessary, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
In Case of Improper Installation
The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to
follow the instructions in this document.
SPECIAL PRECAUTIONS
When Wiring
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.
• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or
death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
When Transporting
Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers.
When Installing…
…In a Ceiling or Wall
Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.
…In a Room
Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.
…In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.
…In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.
When Connecting Refrigerant Tubing
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free
connection.
• Check carefully for leaks before star ting the test run.
When Servicing
• Turn the power OFF at the main power box (mains) before
opening the unit to check or repair electrical parts and
wiring.
• Keep your fingers and clothing away from any moving
parts.
• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
Others
• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.
• Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other heat
source, it can produce dangerously toxic gas.
• Do not install only a single indoor unit.
WARNING
WARNING
CAUTION
CAUTION
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 2
Page 3
3
1. General
This booklet briefly outlines where and how to install the
air conditioning system. Please read over the entire set
of instructions for the indoor and outdoor units and make
sure all accessory parts listed are with the system before
beginning. If the electric wiring diagram does not appear
in this manual, please check for the diagram on the
indoor unit.
1-1. Tools Required for Installation (not supplied)
1. Standard screwdriver
2. Phillips head screwdriver
3. Knife or wire stripper
4. Tape measure
5. Carpenter’s level
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
11. Tube cutter
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
16. Vacuum pump (For R410A)
17. Manifold valve
1-2. Accessories Supplied with Unit
Table 1
1-3. Optional Copper Tubing Kit
Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or A/C workshop.
1-4. Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately from
a local source, you will need:
1. Deoxidized annealed copper tube for refrigerant tubing as detailed in Table 2.
Cut each tube to the appropriate lengths 1' to 1'4"
(30 cm to 40 cm) to dampen vibration between units.
Table 2
2. Foamed polyethylene insulation for the specified
copper tubes as required to precise length of tubing.
Wall thickness of the insulation should be not less
than 5/16" (8 mm).
3. Use insulated copper wire for field wiring. Wire size
varies with the total length of wiring.
Refer to 5. Wiring Instructions for details.
Labels for inter-unit
cable and tube
Reducer
(3/8" 1/2")
1
Packed in the outdoor unit.
1
4 each
Hex wrench Cushion rubber 4
Parts Figure Q’ty Parts Figure Q’ty Parts Figure Q’ty
CMH1972
CMH2472
CMH3172
2
1
ABCD
Reducer
(1/2" 3/8")
CAUTION
Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.
Model
Narrow Tube Wide Tube
Outer Dia. Thickness Outer Dia. Thickness
KMHS0772 1/4" (6.35 mm) 0.0314" (0.8 mm) 3/8" (9.52 mm) 0.0314" (0.8 mm)
KMHS0972 1/4" (6.35 mm) 0.0314" (0.8 mm) 3/8" (9.52 mm) 0.0314" (0.8 mm)
KMHS1272 1/4" (6.35 mm) 0.0314" (0.8 mm) 3/8" (9.52 mm) 0.0314" (0.8 mm)
KMHS1872 1/4" (6.35 mm) 0.0314" (0.8 mm) 1/2" (12.70 mm) 0.0314" (0.8 mm)
KMHS2472 1/4" (6.35 mm) 0.0314" (0.8 mm) 5/8" (15.88 mm) 0.0393" (1.0 mm)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 3
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4
1-5. Additional Materials Required for Installation
1. Refrigeration (armored) tape
2. Insulated staples or clamps for connecting wire
(See local codes)
3. Putty
4. Refrigeration lubricant
5. Clamps or saddles to secure refrigerant tubing
2. Installation Site Selection
2-1. Indoor Unit
AVOID:
G direct sunlight.
G nearby heat sources that may affect performance of the
unit.
G areas where leakage of flammable gas may be expected.
G placing or allowing any obstructions near the A/C inlet or
outlet.
G installing in rooms that contain instant-on (rapid-start)
fluorescent lamps. (These may prevent the A/C from
receiving signals.)
G places where large amounts of oil mist exist.
G installing in locations where there are devices that
generate high-frequency emissions.
DO:
G select an appropriate position from which every corner of
the room can be uniformly cooled. (High on a wall is best.)
G select a location that will hold the weight of the unit.
G select a location where tubing and drain hose have the
shortest run to the outside. (Fig. 1)
G allow room for operation and maintenance as well as
unrestricted air flow around the unit. (Fig. 2)
G install the unit within the maximum elevation difference
(H1, H2, H3, H4) above or below the outdoor unit and
within a total tubing length (L1+L2+L3, L1+L2+L3+L4)
from the outdoor unit as detailed in Table 3 and Fig. 3a.
Drain hose
Indoor unit
Outside drainage
Fig. 1
2" (5 cm)
min.
6" (15 cm)
min.
Front View
2" (5 cm)
min.
Fig. 2
INDOOR
UNIT (1)
INDOOR
UNIT (4)
INDOOR
UNIT (3)
INDOOR
UNIT (2)
Tubing length (L1)
L2
L3
L4
H2
H3
H4
OUTDOOR
UNIT
Elevation
difference (H1)
Fig. 3a
WARNING
To prevent abnormal heat generation
and the possibility of fire, do not
place obstacles, enclosures and
grilles in front of or surrounding the
air conditioner in a way that may
block air flow.
Indoor unit
Floor level
Wall
Minimum height
from floor level
5' (1.5 m)
Fig. 3b
For stable operation of the
air conditioner, do not
install wall-mounted type
indoor units less than 5'
(1.5 m) from floor level.
CAUTION
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 4
Page 5
5
G Install the indoor unit more than 3.3' (1 m) away from any
antenna or power lines or connecting wires used for television, radio, telephone, security system, or intercom.
Electrical noise from any of these sources may affect
operation.
G install in a sturdy manner to avoid increased operating
noise.
Table 3
* If total tubing length becomes 150 to 200 ft. (Max.) or 150 to 230 ft. (Max.), charge additional refrigerant (R410A) by 0.22 oz./ft.
No additional charge of compressor oil is necessary.
Max. Max. Allowable Total Limit of Limit of Elevation Required Amount
Allowable Tubing Length Total Tubing Length Difference of Additional
Model Tubing Length at shipment (L1+L2+L3) or (H1, H2, H3, H4) Refrigerant
per unit (L1+L2+L3) or (L1+L2+L3+L4) (ft.) (oz./ft.)*
(ft.) (L1+L2+L3+L4) (ft.)
(ft.)
CMH1972 82 150 (L1+L2+L3) 150 (L1+L2+L3) 50 —
CMH2472 82 150 (L1+L2+L3+L4) 200 (L1+L2+L3+L4) 50 0.22
CMH3172 100 150 (L1+L2+L3+L4) 230 (L1+L2+L3+L4) 50 0.22
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 5
Page 6
6
(B)
Fig. 4b
Union 1/2"(12.70mm)
1/2"(12.70
mm
)
Flare 3/8"(9.52
mm
)
A joint for connecting tubes of
different sizes
(3/8"(9.52mm) 1/2"(12.70mm)) Supplied Reducer
1/4"(6.35mm)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
C
B
A
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
(KMHS1872)
3/8"(9.52mm)
3/8"(9.52mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
(A)
Fig. 4c
Union 3/8"(9.52mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 3/8"(9.52mm)) Supplied Reducer
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
1/2"(12.70mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
(2) Connecting indoor unit for CMH2472
(A)
Fig. 4a
3/8"(9.52mm)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
3/8"(9.52
mm
)
C
B
A
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
2-2. Connecting Indoor Units
(1) Connecting indoor unit for CMH1972
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 6
Page 7
7
(B)
Fig. 4d
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS1872)
1/2"(12.70
mm
)
1/2"(12.70
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
(D)
Fig. 4f
Union 5/8"(15.88mm)Flare 1/2"(12.70mm)
(1/2"(12.70
mm
) 5/8"(15.88mm))
Locally purchased
C
B
A
(KMHS1872)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS2472)
Union 1/2"(12.70mm)Flare 3/8"(9.52mm)
(3/8"(9.52
mm
) 1/2"(12.70mm))
Locally purchased
1/2"(12.70mm)
1/2"(12.70
mm
)
5/8"(15.88mm)
3/8"(9.52
mm
)
3/8"(9.52mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
(C)
Fig. 4e
Union 5/8"(15.88mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 5/8"(15.88mm)) Locally purchased
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS2472)
1/2"(12.70mm)
3/8"(9.52mm)
3/8"(9.52mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
5/8"(15.88mm)
3/8"(9.52mm)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35mm)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 7
Page 8
8
(A)
Fig. 4g
Union 3/8"(9.52mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 3/8"(9.52mm)) Supplied Reducer
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
1/2"(12.70mm)
1/2"(12.70
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
(3) Connecting indoor unit for CMH3172
(B)
Fig. 4h
Union 3/8"(9.52mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm 3/8"(9.52mm)) Supplied Reducer
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS1872)
1/2"(12.70mm)
1/2"(12.70
mm
)
1/2"(12.70
mm
)
3/8"(9.52mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35mm)
1/4"(6.35
mm
)
(C)
Fig. 4i
C
B
A
(KMHS1872)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS1872)
1/2"(12.70
mm
)
1/2"(12.70
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/2"(12.70mm)
1/2"(12.70
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/4"(6.35mm)
1/4"(6.35
mm
)
1/4"(6.35mm)
1/4"(6.35
mm
)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 8
Page 9
9
(D)
Fig. 4j
Union 5/8"(15.88mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 5/8"(15.88mm))
Locally purchased
C
B
A
(KMHS0772,KMHS0972,KMHS1272)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS2472)
Union 3/8"(9.52mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 3/8"(9.52mm))
Supplied Reducer
1/2"(12.70mm)
1/2"(12.70
mm
)
5/8"(15.88
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
3/8"(9.52mm)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35mm)
1/4"(6.35
mm
)
(E)
Fig. 4k
Union 5/8"(15.88mm)Flare 1/2"(12.70mm)
(1/2"(12.70mm) 5/8"(15.88mm)) Locally purchased
C
B
A
(KMHS1872)
(KMHS0772,KMHS0972,KMHS1272)
D
Outdoor unit Indoor unit
(KMHS0772,KMHS0972,KMHS1272)
(KMHS2472)
1/2"(12.70mm)
1/2"(12.70
mm
)
5/8"(15.88
mm
)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/2"(12.70mm)
3/8"(9.52
mm
)
3/8"(9.52
mm
)
1/4"(6.35
mm
)
1/4"(6.35
mm
)
1/4"(6.35mm)
1/4"(6.35
mm
)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 9
Page 10
10
2-3. Outdoor Unit
AVOID:
G heat sources, exhaust fans, etc. (Fig. 5a)
G damp, humid or uneven locations.
DO:
G choose a place as cool as possible.
G choose a place that is well ventilated.
G allow enough room around the unit for air intake/
exhaust and possible maintenance. (Fig. 5b)
G provide a solid base (level concrete pad, concrete
block, 6" ¥ 1'4" (15 ¥ 40 cm) beams or equal), a minimum of 6" (15 cm) above ground level to reduce
humidity and protect the unit against possible water
damage and decreased service life. (Figs. 5c and 5d)
G Install cushion rubber under unit’s feet to reduce
vibration and noise. (Fig. 5e)
G use lug bolts or equal to bolt down unit, reducing
vibration and noise.
G Install in a location where no antenna of a television
or radio exists within 10' (3 m).
Outdoor unit
Hot air
Heat source
Exhaust fan
NO
Fig. 5a
Fig. 5b
Fig. 5d
Air intake Min. 8" (20 cm)
Air discharge
Min.
4" (10 cm)
Min.
1ʼ8" (50 cm)
Valve
side
Min. 10"
(25 cm)
Min.
7' (2 m)
Min.
7' (2 m)
Ground
Obstacle
Obstacle above
Air discharge
Min. 8" (20 cm)
Air intake
Air intake
Concrete
or equal
About 6" (15 cm)
Min. 6" (15 cm)
Anchor bolts
(4 pcs.)
About 16" (40 cm)
Fig. 5e
Cushion rubber
CAUTION
A solid base must not cover
the hole of the bottom plate.
Drain holes
Fig. 5c
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 10
Page 11
11
Fig. 6a
23-15/16
5-11/32
15/32
35-7/16 (900)
13-19/32
12-19/32
14-17/32
2-29/32
29-1/8 (740)
23/32
1-13/16
2-1/16
5-29/32
2-27/32
2-3/4
2-1/32
4-7/16
2-15/16
2-3/4
4-1/2
A
Service valve on narrow tube side
(Outer diameter 1/4"(
6.35
))
Service valve on wide tube side
(Outer diameter 3/8"(
9.52
))
A
(1) CMH1972
Fig. 6b
23-15/16
5-11/32
15/32
12-19/32
13-19/32
14-17/32
35-7/16 (900)
29-1/8 (740)
2-1/16
1-13/16
2-29/32
2-13/32
A
4-1/2
2-1/32
5-29/32
2-27/32
2-3/4
4-7/16
2-15/16
2-3/4
Service valve on narrow tube side
(Outer diameter 1/4"(
6.35
))
Service valve on wide tube side
(Outer diameter 3/8"(
9.52
))
Service valve on wide tube side
(Outer diameter 1/2"(
12.70
))
A
23/32
Fig. 6c
23-15/16
15/32
12-19/32
13-19/32
14-17/32
5-11/32
35-7/16 (900)
23/32
35-1/32 (890)
2-29/32
2-1/16
1-13/16
2-13/32
4-1/2
2-1/32
4-7/16
5-29/32
2-15/16
2-27/32
2-3/4
2-3/4
A
Service valve on narrow tube side
(Outer diameter 1/4"(
6.35
))
Service valve on wide tube side
(Outer diameter 1/2"(
12.70
))
Service valve on wide tube side
(Outer diameter 3/8"(
9.52
))
A
(2) CMH2472
(3) CMH3172
2-4. Outer Dimensions of Outdoor Unit
unit: inch (mm)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 11
Page 12
12
2-5. Diagram of Outdoor Unit Installation
Never install only a single indoor unit.
Be sure to connect indoor and outdoor units only in
combinations that are listed in the catalog or in the
combination table that was provided with the outdoor unit.
(Use caution. Connecting any other model may result in
operation failure and malfunction.)
The dimensions indicated by in the figure below are
spaces that are required in order to maintain
performance. Install in a location where the dimensions
indicated by are ensured, and where 2 or more faces
of the unit are unobstructed. In principle, the top direction
should be unobstructed.
Indoor unit C
Indoor unit B
Indoor unit A
Indoor unit D
Service space
Power breaker
Ground
wire
(not
provided)
Ensure 6"(15cm)
of space if a
drain hose is to
be used.
Base (not provided)
(concrete or similar material)
Fasten with anchor bolts
(not provided)
(3/8" or M10, 4 locations)
A
B
C
D
Access panel C
Over 10"(25cm)
Over 8"(20cm)
Over 4"(10cm)
Over 1'8"(50cm)
Fig. 7
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 12
Page 13
13
3. Installation Process
3-1. Embedding the Tubing and Wiring
G Do not connect tubes to locations that are embedded.
G Be sure to bind refrigerant tubing and inter-unit cables
together with vinyl tape.
G The power cable must be obtained on-site.
(#12: Less than 85 ft.)
# ... AWG (American Wire Gauge)
G Be sure to apply the provided labels to both ends of
the inter-unit cables to prevent miswiring.
G Securely seal the end of embedded tubing with vinyl
tape in order to prevent dirt or moisture entry.
G In order to prevent insulation breakdown and ground
faults, do not allow the wire ends to contact rainwater,
or be subject to dew condensation.
Deburring
Before
After
Fig. 8
3-2. Use of the Flaring Method
Many of the conventional split system air conditioners
employ the flaring method to connect refrigerant tubes
which run between indoor and outdoor units. In this
method, the copper tubes are flared at each end and
connected with flare nuts.
3-3. Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a
tube cutter. It is recommended to cut approx. 12" to
20" (30 to 50 cm) longer than the tubing length you
estimate.
(2) Remove burrs at the end of the copper tube with a
tube reamer or file. This process is important and
should be done carefully to make a good flare.
(Fig. 8)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 13
Page 14
14
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 9)
(3) Remove the flare nut from the unit and be sure to mount
it on the copper tube.
(4) Make a flare at the end of copper tube with a flare tool.*
(Figs. 10 and 11)
(*Use “RIGID” or equivalent.)
A good flare should have the following characteristics:
G inside surface is glossy and smooth.
G edge is smooth.
G tapered sides are of uniform length.
3-4. Caution before Connecting Tubes Tightly
a) Be sure to apply a sealing cap or water-proof tape to
prevent dust or water from getting into the tubes before
they are used.
b) Be sure to apply refrigerant lubricant to the matching
surfaces of the flare and union before connecting them
together. This is effective for reducing gas leaks.
(Fig. 12)
c) For proper connection, align the union tube and flare
tube straight with each other, then screw in the flare nut
lightly at first to obtain a smooth match. (Fig. 13)
3-5. Tubing Connections
a) Temporary connection:
Screw in 3 – 5 rotations by hand. (Fig.14)
b) To fasten the flare nuts, apply specified torque as:
Table 4
NOTE
NOTE
Reamer
Copper
tubing
Fig. 9
Flare tool
Flare nut
Copper
tubing
Fig. 11
Fig. 10
Apply refrigerant
lubricant here and here
Fig. 12
Flare nut
Union
Fig. 13
0 to 0.0196"
(0 to 0.5 mm)
If the special R410A
flare tool is used:
0.0472" (1.2 mm)
If the previous flare tool
(clutch-type) is used:
Adjust so that the amount of tube
p
rotrusion is as shown in the figure.
Tube Dia. Tightening Torque
1/4" (6.35 mm) Approx. 120 – 160 lbs·in (140 – 180 kgf· cm)
3/8" (9.52 mm) Approx. 300 – 360 lbs·in (340 – 420 kgf· cm)
1/2" (12.70 mm) Approx. 430 – 540 lbs· in (490 – 610 kgf·cm)
5/8" (15.88 mm) Approx. 590 – 710 lbs· in (680 – 820 kgf·cm)
Apply the provided labels
to the indoor and outdoor
unit tubing connectors to
prevent errors in
connections.
Service valve on
narrow tube side
Service valve on
wide tube side
A
B
C
D
Fig. 14
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 14
Page 15
15
3-6. Insulation of Refrigerant Tubing
To prevent heat loss and wet floors due to dripping of condensation, both tubes must be well insulated with a
proper insulation material.
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 17)
3-7. Taping the Tubes
(1) At this time, the 2 refrigerant tubes (and electrical wire
if local codes permit) should be taped together with
armoring tape. The drain hose may also be included
and taped together as 1 bundle with the tubing.
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As
you wrap the tubing, overlap half of each previous tape
turn. (Fig. 18)
(3) Clamp the tubing bundle to wall, using 1 clamp approx.
every 47" (120 cm).
Do not wind the armoring tape too tightly, since this will
decrease the heat insulation effect. Also, be sure the condensation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
3-8. Finishing the Installation
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent rain
and draft from entering. (Fig. 19)
NOTE
IMPORTANT
Indoor unit
Outdoor unit
Spanner
Torque wrench
Fig. 15
Insulation
Min.
5/16"
(8 mm)
Thickness:
min. 5/16"
(8 mm)
Fig. 17
Fig. 18
Clamp
Insulated tubes
Apply putty here
Tubing
Fig. 19
CAUTION
After a tube has been insulated,
never try to bend it into a
narrow curve, as this may
cause the tube to break or
crack.
Insulation
Fig. 16
CAUTION
Be sure to match refrigerant
tubing and electric wiring
between indoor and outdoor
units. For more details, refer to
“Tubing Check Control” in the
Technical & Service Manual.
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 15
Page 16
16
4. Air Purging
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below. Therefore, they
must be purged completely.
G pressure in the system rises
G operating current rises
G cooling efficiency drops
G moisture in the air may freeze and block capillary tubing
G water may lead to corrosion of parts in the refrigerant
system
I
Air Purging with a Vacuum Pump
(for Test Run)
G In order to protect the earth’s environment, be sure to use
a vacuum pump to perform the air purge.
(Never perform an air purge by using the refrigerant gas
cylinder or other external gas, or by using the gas inside
the outdoor unit.)
Perform the air purge for tubes A, B, C, and D. Use the
same procedures for all tubes.
(1) Check that each tube (both narrow and wide tubes)
between the indoor and outdoor units have been
properly connected and all wiring for the test run has
been completed. Note that both narrow and wide tube
service valves on the outdoor unit are kept closed at
this stage.
(2) Using an adjustable wrench or box wrench, remove
the valve caps from the service valve on both narrow
and wide tubes.
(3) Connect a vacuum pump and a manifold valve (with
pressure gauges) to the service port on the wide tube
service valve. (Fig. 20).
Fig. 20
Fig. 21
CAUTION
Be sure to use a manifold valve for
air purging. If it is not available,
use a stop valve for this purpose.
The “Hi” knob of the manifold
valve must always be kept closed.
CAUTION
CAUTION
Before using the vacuum pump
adapter, read the vacuum pump
adapter manual, and use the
adapter correctly.
In order to prevent charging errors with
A/C that uses R410A, the screw diameter
at the service valve charging port has
been changed. When recharging or performing other servicing, use the special
charging hose and manifold gauge.
G When using a hex wrench to open the spindle, an
extremely small amount of refrigerant may leak.
This does not indicate a problem.
G Use a hex wrench of a type to which force can be
easily applied.
Service
valve on
wide tube
side
Service
valve on
narrow
A
B
C
D
Vacuum
pump
Vacuum pump
adapter
(for preventing
reverse flow)
(special for
R410A)
High-pressure valve
Manifold gauge
(special for R410A)
Low-pressure
valve
Leave the
valve open.
Open
Charging hose
(special for R410A)
Hex wrench
With push-pin
HiLo
Cap tightening torque:
170 – 215 lbs·in
(200 – 250 kgf·cm)
(Tighten by hand, then
use a wrench to turn.)
Stopper
Spindle
Screw diameter: 1/2
UNF 20 threads
Valve core
Cap nut tightening torque:
60 – 95 lbs·in
(70 – 110 kgf·cm)
(Tighten by hand, then use a
wrench to turn approximately 30 .)
<Structure of service valve on wide tube side>
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 16
Page 17
17
(4) With the “Lo” knob of the manifold valve open and
high-pressure valve (“Hi”) closed completely, run
the vacuum pump. Run the pump until the pressure is –101 kPa (–76 cmHg). The operation time
for the vacuum pump varies with tubing length and
the capacity of the pump. The following table
shows the amount of time required for evacuation:
Table 5
The required time in the above table is calculated
based on the assumption that the ideal (or target) vacuum condition is around 10 mmHg abs.
(5) With the vacuum pump still running, close the “Lo”
knob of the manifold valve. Then stop the vacuum
pump. Fully close the low-pressure valve and stop
the vacuum pump. (Wait 1 – 2 minutes and check
that the manifold gauge pointer does not return. If
it does return, find and repair the leak, then apply
the vacuum again.)
(6) With a hex wrench, turn the valve stem on the nar-
row tube service valve counter-clockwise by 90
degrees (1/4 turn) for 10 seconds, and then turn
the stem clockwise to close it again.
(7) With a standard screwdriver, turn the wide tube
service valve stem counterclockwise to fully open
the valve.
(8) Turn the narrow tube service valve stem counter-
clockwise to fully open the valve.
(9) Loosen the vacuum hose connected to the wide
tube service port slightly to release the pressure.
Then, remove the hose.
(10) Leak test all joints at the tubing (both indoor and
outdoors) with liquid soap. Bubbles indicate a leak.
Be sure to wipe off the soap with a clean cloth.
NOTE
CAUTION
Be sure to completely insert
the hex wrench before
attempting to turn the valve.
Required time for evacuation when capacity
of 100 liter/h vacuum pump is used
20 min. or more
CAUTION
If a CFC gas detector is used,
use a special detector for HFC
refrigerant (such as R410 and
R134a).
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 17
Page 18
18
I Pump Down
G When relocating or disposing of the A/C, request this service from
the dealer where the unit was purchased, or from an appropriate
agent. Perform pump-down as described below.
What is pump-down?
G Pump-down refers to recovering the refrigerant gas from the refrig-
erant cycle at the outdoor unit. This work must be performed during cooling operation. The refrigerant gas cannot be recovered
during heating operation.
G During winter, or if the temperature sensor prevents cooling opera-
tion, perform “forced cooling operation.”
Pump-down procedure
(1) Fully close the spindles at the valves on the narrow tube side of
tubes A, B, C and D. (Refer to Fig. 22.)
(2) Connect the manifold gauge to the charging port at the valve on
the wide tube side of tube D. Purge the air from the charging hose.
(Refer to Fig. 23.)
(3) Perform cooling operation or forced cooling
operation.
When the pressure at the low-pressure side is 0.15 – 0.2 MPa
(0.5 – 1 kg/cm
2
G), fully close the spindles at the valves on the
wide tube side of tubes A, B, C, and D, and immediately stop
operation. (Refer to Fig. 23.)
In the winter, the outdoor unit may stop after 5 - 10 minutes of
operation. This is in order to protect the indoor unit heat
exchanger from freezing and does not indicate a problem.
(4) Disconnect the manifold gauge and the inter-unit tubes, and
attach the caps and flare nuts. At this point, pump-down is completed. (If the caps and flare nuts are not reattached, there is the
danger of gas leakage.) (Refer to Fig. 24.)
If pump-down is not possible
If the A/C cannot be operated because of a malfunction or other
cause, use a refrigerant recovery device to recover the refrigerant.
In order to protect the earth’s environment, be sure to perform pump-down to recover refrigerant
gas without releasing it into the atmosphere.
Fig. 22
(11) Replace the flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or
box wrench. Next, mount the valve cap and tighten it with a torque wrench (the cap needs to be tightened with the
torque of 180 lbs·in (200 kgf·cm)). This process is very important to prevent gas from leaking from the system.
(12) Test run the air conditioner. (See page 23.)
(13) While the air conditioner is running, apply liquid soap to check for any gas leaks around the service valves or caps.
(14) If there is no leakage, stop the air conditioner.
(15) Wipe off the soap on the tubing.
This completes air purging with a vacuum pump and the air conditioner is ready for actual operation.
Fig. 23
C
D
B
A
Manifold gauge
Wide tube side
Cap
Cap
Cap
Cap
After disconnecting
the inter-unit tubes,
attach the flare nuts
with flare bonnets.
Fig. 24
D
C
B
A
Charging port
Narrow tube side
Close
Close
Close
Close
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 18
Page 19
19
5. Wiring Instructions
5-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring
closely following the wiring diagram.
(2) Provide a power outlet to be used exclusively for each
unit, with a power supply disconnect and circuit breaker for overcurrent protection provided in the exclusive
line.
(3) To prevent possible hazard due to insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done tightly and in
accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become
damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.
5-2. Recommended Wire Length and Diameter
Regulations on wiring diameter differ from locality to locality.
For field wiring requirements, please refer to your local electrical codes. Carefully observe these regulations when carrying out the installation.
Table 6 shows maximum wire lengths for control line and
power line and fuse or circuit capacity.
Refer to the wiring system diagram (Fig. 25a or 25b) for the
meaning of (A), (B), and (C) in Table 6.
Refer to your local codes or in the absence of local codes
see the National Electric Code: ANSI/NFPA70.
NOTE
Table 6
AWG
Max. Power Line Length (ft.)
(A)
Max. Control Line Length (ft.)
(B) (C)
Fuse
or
Circuit Capasity
Model
(#12) (#14)
CMH1972 85 (Max.) 82 (Max.) 20 A
CMH2472 85 (Max.) 82 (Max.) 20 A
CMH3172 85 (Max.) 100 (Max.) 20 A
# ... AWG (American Wire Gauge)
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 19
Page 20
20
WARNING
G Be sure to comply with local codes on running the
wire from the indoor unit to the outdoor unit (size
of wire and wiring method, etc.).
G Each wire must be firmly connected.
G No wire should be allowed to touch refrigerant
tubing, the compressor, or any moving part.
G Be sure to connect power wires correctly match-
ing up numbers on terminals of the outdoor unit
and respective indoor units A – D.
CAUTION
G Be sure to connect the power supply line to the
outdoor unit as shown in the wiring diagram. The
indoor unit draws its power from the outdoor unit.
G Do not run wiring for antenna, signal, or power
lines of television, radio, stereo, telephone, security system, or intercom any closer than 3'4" (1 m)
from the power cable and wires between the
indoor and outdoor units. Electrical noise may
affect the operation.
G To avoid the risk of electric shock, each air conditioner
unit must be grounded.
G For the installation of a grounding device, please
observe local electrical codes.
G Grounding is necessary, especially for units using
inverter circuits, in order to release charged electricity
and electrical noise caused by high tension.
Otherwise, electrical shock may occur.
G Place a dedicated ground more than 7' (2 m) away from
other grounds and do not have it shared with other
electric appliances.
WARNING
Fig. 25a
Fig. 25b
4 indoor units with CMH2472, CMH3172
1
2
3
Terminal
INDOOR UNIT
1
2
3
INDOOR UNIT
1
2
3
1
UNIT B
2
3
4
UNIT C
5
6
7
8
9
1
2
TerminalTerminal
L1
L2
INDOOR UNIT
UNIT A
(A)
(B)
(C)
Terminal
(2P)
Ter m i n al(9P
)
OUTDOOR UNIT
Disconnect
switch
230/208V
230/208V
230/208V
230/208V
230/208V
230/208V
230/208V
230/208V
230/208V
Grounding
line
Grounding
line
Disconnect
switch
Field supply
Disconnect
switch
Field supply
Field supply
Power supply
Single-phase 230/208VAC 60HZ
Grounding
line
Grounding line
(A)
(B)
(B)
(B)
(B)
(B)
(B)
(C)
(C)
(C)
1
2
3
Terminal
1
UNIT B
2
3
4
UNIT C
5
6
7
UNIT D
8
9
10
11
12
1
2
L1
L2
INDOOR UNIT
UNIT A
(A)
1
2
3
Terminal
INDOOR UNIT
(B)
Terminal
(
2P
)
Terminal(12P
)
OUTDOOR UNIT
Disconnect
switch
230/208V
230/208V
230/208V
230/208V
230/208V
230/208V
Grounding line
Grounding line
Field supply
230/208V
230/208V
230/208V
230/208V
1
2
3
Terminal
INDOOR UNIT
(C)
1
2
3
Terminal
INDOOR UNIT
(D)
(Inter-unit)
power line
230/208V
230/208V
Power supply
Single-phase 230/208VAC 60HZ
Grounding line
Grounding
line
Grounding
line
Disconnect switch
Field supply
Disconnect
switch
Field supply
Disconnect switch
Field supply
(A)
(B)
(B)
(B)
(B)
(B)
(B)
(B)
(B)
(C)
(C)
(C)
(C)
3 indoor units with CMH1972
5-3. Wiring System Diagram
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 20
Page 21
21
When connecting each power wire to the corresponding
terminal, follow the instructions “How to connect wiring
to the terminal” and fasten the wire securely tight with
the fixing screw of the terminal plate.
How to connect wiring to the terminal
a) For Indoor Unit
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the wire about 9/32" (7 mm).
See the label (Fig. 26) near the terminal plate.
(2) Using a screwdriver, loosen the terminal screw on
the terminal plate.
(3) Inser t the wire and tighten the terminal screw com-
pletely using a screwdriver.
b) For Outdoor Unit
I For solid core wiring (or F-cable)
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the solid wire about 15/16" (25
mm). (Fig. 27)
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
(3) Using the pliers, bend the solid wire to form a loop
suitable for the terminal screw.
(4) Shape the loop wire properly, place it on the termi-
nal plate and fix it securely with the removed terminal screw using a screwdriver.
I For stranded wiring
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the stranded wiring about 3/8"
(10 mm) and tightly twist the wire ends. (Figs. 28
and 29)
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
(3) Using a ring connector fastener or pliers, securely
clamp each stripped wire end with a ring connector.
(Fig. 28)
(4) Place the ring connector wire, and replace and
tighten the removed terminal screw using a screwdriver. (Fig. 30)
Solid wire
Loop
Insulation
Strip 15/16" (25 mm)
Fig. 27
STRIP
SIZE
9/32"
(7 mm)
(ACTUAL
SIZE)
Fig. 26
Stranded wire
Ring
connector
Strip 3/8" (10 mm)
Fig. 28
Screw
Ring connector
Terminal plate
Wire
Special
washer
Fig. 30
Screw and
special washer
Ring
connector
Wire
WARNING
Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist. Therefore, be sure all wiring is
tightly connected.
Twist wire ends
Fig. 29
5-4. How to Connect Wiring to the Terminal
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 21
Page 22
1
2
3
1
2
3
1
2
3
1
2
3
Indoor unit D
Indoor unit B
Indoor unit A
Indoor unit C
Ground
Powe r:
Single-phase,
230/208VAC 60HZ
Power switch
(not provided)
Outdoor unit A
Terminal board
Label A
Inter-unit cables
#14 (not provided)
Terminal board
Inter-unit cables
#14 (not provided)
Terminal board
Label B
Label C
Inter-unit cables
#14 (not provided)
Terminal board
Inter-unit cables
#14 (not provided)
Terminal board
Label D
A
B
C
D
Power cable (not provided)
(#12: Less than 85 ft.)
Be sure to perform grounding.
Attach a ground wire to either the
outdoor unit or indoor unit.
If there is a grounding terminal
inside the room, use the grounding
screw inside the indoor unit.
Be sure to apply the provided labels to both
ends of the inter-unit cables to prevent miswiring. The units will not function if the wiring
connections are incorrect.
A is the indoor unit with
refrigerant tubing that is
connected to service valve
A (top) of the outdoor unit.
refrigerant tubing that is
connected to service valve
B (top) of the outdoor unit.
B is the indoor unit with
refrigerant tubing that is
connected to service valve
C (top) of the outdoor unit.
C is the indoor unit with
refrigerant tubing that is
connected to service valve
D (top) of the outdoor unit.
D is the indoor unit with
1 2
1 2 3 4 5 6 7 8 9 10 11 12
Power supply
(conduit)
Inter Unit
(conduit)
# ... AWG (American Wire Gauge)
22
5-5. Wiring Instructions for the Outdoor Unit
G Be sure to correctly align inter-unit cables A, B, C and D.
G Use a dedicated A/C circuit for power.
G To make connections to the outdoor unit, remove the
inspection panel and tubing panel.
G Do not bring the inter-unit cables or power cable into
contact with tubing or service valves.
G Use outdoor unit cable fasteners and fasten the inter-
unit cables at the location where the cables are doublesheathed.
G Arrange the wiring so that the inter-unit cables are con-
tained in the inspection panel and tubing panel, as
shown in Fig. 31.
CAUTION
Fig. 31
05-352 KMHS0772_outdoor 3/17/06 2:56 PM Page 22
Page 23
23
Regulations on wire size differ from locality to locality. For
field wiring requirements, please refer to your local electrical codes. Make sure that the installation fully complies
with all local and national regulations.
(1) Remove access panel “C”. (Fig. 32)
(2) Connect the inter-unit and power supply line accord-
ing to the drawing on the panel side.
(3) Be sure to size each wire allowing approx. 4"
(10 cm) longer than the required length for wiring.
Store excess wiring inside the cabinet.
(4) When connections are completed, check that all con-
nections are correct as shown in the wiring system
diagram on panel side.
(5) Be sure to ground the unit according to your local
codes.
Fig. 32
Lock nut
Conduit
plate
Plug
Inter unit
(Conduit)
Power supply
(Conduit)
Cabinet
Terminal
block
Access panel “C”
Fig. 33
Conduit plate
Make sure there is no gap between
access panel “C” and the conduit plate.
Access panel C
CAUTION
6. Test Run
Performing a test run
G Refer to the test run procedures in the indoor unit
installation manual.
G Perform the test run separately for each connected
indoor unit. If 2 units are operated simultaneously, it is
not possible to correctly check for errors in tubing and
wiring.
G If the room temperature is 59°F (15°C) or below, it may
not be possible to check for tubing errors with cooling
operation. If this occurs, perform heating operation for
each unit individually, and check that warm air is
discharged from each unit. If there is cold air mixed in
with the warm air, check the tubing connections again.
Checking tubing and wiring
Perform the test run and check that operation is normal. If
there is an error in tubing or wiring, the refrigerant may
flow to indoor unit B when indoor unit A is operated (for
example).
G Stop operation immediately if there is an error in tubing
or wiring. Turn the power (breaker) to OFF, and check
whether the inter-unit cables are connected incorrectly,
or whether the narrow tubes A and B are connected in
reverse. Correct the connections.
G If there is an error in tubing, pump-down must be per-
formed. Be sure to perform pump-down. After making
corrections, again purge the air from the tubes.
CAUTION
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7. Connecting a Home Automation device
The HA (white) 4P terminal is located on the indoor unit PCB. If a HA device will be used,
connect it to this terminal.
8. Installation Check Sheet
The strength of the installation location is sufficient to support the A/C weight.
The indoor and outdoor units are installed level and vertically.
The power and voltage are as specified.
Inter-unit cables are securely fastened to the terminal board.
Inter-unit cables are securely fixed.
The power cord and inter-unit cables are not connected anywhere along their paths.
The ground wire is securely connected.
An air purge of the refrigerant circuit has been conducted.
A leak test of the tubing connections has been performed.
Thermal insulation has been applied to the tubing connections.
Drain connections are secure and water drains properly.
Putty has been used to close the hole in the wall.
All service valves are fully open.
Remote controller signals are being positively received.
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