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OUTDOOR UNIT
OUTDOOR UNIT INSTALLATION
Install the unit where it will not be tilted by more than 3°. However, do not install the unit with it tilted to-
wards the side containing the compressor.
When installing the outdoor unit where it may exposed to strong wind, fasten it securely.
(1) Outdoor unit to be fasten with bolts at the four places
indicated by the arrows without fail.
Drain cap
Bottom side
mounting place
25-9/16"
(650 mm)
Drain pipe
4-ø 12 hole
mounting place
Bolt
(2) F i x s e c u r e l y w i t h
Nut
b o l t s o n a s o l i d
block. (Use 4 sets of
commercially avail-
able M10 bolt, nut
and washer.)
CONNECTING THE PIPE
1. CONNECTION PIPES
Outdoor unit
Valve cover removal.
• Remove the one mounting screw.
• Remove the valve cover by sliding upward.
Valve cover
Hook (4 places)
(1) Detach the caps and plugs from the pipes.
(2) Centering the pipe against port on the outdoor unit, turn the
flare nut with your hand.
To prevent gas leakage, coat the flare
surface with alkylbenzene oil (HAB).
Do not use mineral oil.
(3) Tighten the flare nut of the connection pipe at the outdoor unit
valve connector.
3-way valve
(Liquid)
Flare nut
Connection pipe
(Liquid)
3-way valve
(Gas)
Flare nut
Connection pipe
(Gas)
ELECTRICAL WIRING (OUTDOOR UNIT)
CAUTION
When connecting the power supply cord, make sure that
the phase of the power supply matches with the phase of
the terminal board. If the phases do not match, the
compressor will rotate in reverse and will not be able to
compress.
(1) Service cover removal
• Remove the two mounting screws.
• Remove the service cover by pushing downwards.
(2) Fasten the power supply cord and the connection cord to the
conduit holder using the lock nut.
(open the knock out holes if necessary)
(3) Connect the power supply cord and the connection cord to
terminal.
(4) Fasten the power supply cord and connection cord with cord
clamp.
G
G
Cord clamp
Power supply cord
Connection cord
(indoor unit and
outdoor unit
connection cord)
INDOOR
OUTDOOR UNIT
14AWG
INDOOR UNIT
(Inter-unit)
Power lines
TERMINAL
TERMINAL
230/208 V
1
1
230/208 V
2
2
230/208 V
3
3
G
G
L1
DISCON-
NECT
L2
SWITCH
(FIELD
SUPPLY)
G
G
Grounding
line
Indoor unit
Outdoor unit
terminal block
terminal block
1
2
3
4
Earth screw
1
2
3
Earth screw
Disconnect switch
G
G
Power supply line
NOTE:
Factory installed protective inline fuses for indoor units' conductors
are installed on the Power Supply PCB.
9374995431_IM_EN.indd 2
WARNING
(3) Since the drain water flows out of the outdoor unit during heat-
ing operation, install the drain pipe and connect it to a commer-
cial 5/8" (16 mm) hose. (Reverse cycle model only)
(4) When installing the drain pipe, plug all the holes other than the
drain pipe mounting hole in the bottom of the outdoor unit with
putty so there is no water leakage. (Reverse cycle model only)
Drain pipe mounting hole
Drain pipe
CAUTION
Block
When the outdoor temperature is 32 °F (0 °C) or less, do not use the
accessory drain pipe and drain cap. If the drain pipe and drain cap
are used, the drain water in the pipe may freeze in extremely cold
weather. (Reverse cycle model only)
(4) When the flare nut is tightened properly by your hand, use a
torque wrench to finally tighten it.
Holding spanner
Body side
90°
Torque wrench
Flare nut tightening torque
Flare nut [in. (mm)]
Tightening torque [lbf·ft (N·m)]
3/8 (9.52) dia.
23.6 to 31.0 (32 to 42)
5/8 (15.88) dia.
46.5 to 55.3 (63 to 75)
Direction of
the service
Service cover
panel removal
Control box
Lock
nut
Terminal
Power supply
Keep the earth wire longer than the other wires.
Earth wire
WARNING
Disconnect switch for over current protection given in
the table below is to be installed between the indoor
unit and the outdoor unit.
Disconnect switch
20A
CAUTION
Be sure to comply with local codes while running the
L1 L2
wire from the indoor unit to the outdoor unit (size of
Earth screw
wire and wiring method, etc.).
G
Every wire must be connected firmly.
No wire should be allowed to touch refrigerant tubing,
the compressor or any moving part.
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.
Connect wires to the matching numbers of terminals.
2. VACUUM
(1) Remove the cap, and connect the gauge manifold and the vacuum pump to the charging valve by the service hoses.
(2) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates -0.1 MPa (-76 cmHg).
(3) When -0.1 MPa (-76 cmHg) is reached, operate the vacuum pump for at least 60 minutes.
(4) Disconnect the service hoses and fit the cap to the charging valve to the specified torque.
(5) Remove the blank caps, and fully open the spindles of the 2-way and 3-way valves with a hexagon wrench [Torque: 6~7 N·m (60 to 70
kgf·cm)].
(6) Tighten the blank caps of the 2-way valve and 3-way valve to the specified torque.
3/8" (9.52 mm)
Blank
cap
5/8" (15.88 mm)
Charging port cap
Connecting pipe
Base
Outdoor unit
Service hose
with valve core
Cap
Do not purge the air with refrigerants, but use a vacuum pump to vacuum the installation!
There is no extra refrigerant in the outdoor unit for air purging!
Use a vacuum pump and gauge manifold and charging hose for R410A exclusively.
Using the same vacuum for different refrigerants may damage the vacuum pump or the unit.
3. ADDITIONAL CHARGE
Refrigerant suitable for a piping length of 66ft(20m) is
charged in the outdoor unit at the factory.
When the piping is longer than 66ft(20m), additional
charging is necessary.
For the additional amount, see the table below.
When moving and installing the air conditioner, do not mix gas other than the specified refrigerant R410A in-
side the refrigerant cycle.
When charging the refrigerant R410A, always use an electronic balance for refrigerant charging (to measure
the refrigerant by weight).
When charging the refrigerant, take into account the slight change in the composition of
the gas and liquid phases, and always charge from the liquid phase side whose composi-
tion is stable.
Add refrigerant from the charging valve after the completion of the work.
If the units are further apart than the maximum pipe length, correct operation cannot be guaranteed.
4. GAS LEAKAGE INSPECTION
After connecting the piping, check the all joints for gas leakage with gas leak detector.
When inspecting gas leakage, always use the vacuum pump for pressure. Do not use nitrogen gas.
Use ring terminals and tighten the terminal screws to the specified torques, otherwise, abnormal overheating
may be produced and possibly cause heavy damage inside the unit.
Match the terminal block numbers and connection cord colors with those of the outdoor unit. Erroneous wir-
ing may cause burning of the electric parts.
Connect the connection cords firmly to the terminal block. Imperfect installation may cause a fire.
Hook
(3 places)
Always fasten the outside covering of the connection cord with the cord clamp. (If the insulator is chafed,
electric leakage may occur.)
Securely earth the power cord plug.
Do not use the earth screw for an external connector. Only use for interconnection between two units.
HOW TO CONNECT THE WIRE TO THE TERMINALS
(1) Use ring terminals with insulating sleeves as shown in the
figure below to connect to the terminal block.
(2) Securely clamp the ring terminals to the wires using an
appropriate tool so that the wires do not come loose.
(3) Use the specified wires, connect them securely, and fasten
them so that there is no stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws.
Do not use a screwdriver that is too small, otherwise, the screw
heads may be damaged and prevent the screws from being
properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the
Inter-unit line
screws may break.
(6) See the table below for the terminal screw tightening torques.
Tightening torque
M4 screw
1.2 to 1.8 N·m (12 to 18 kgf·cm)
M5 screw
2.0 to 3.0 N·m (20 to 30 kgf·cm)
PUMP DOWN OPERATION (FORCED COOLING OPERATION)
Power supply
To avoid discharging refrigerant into the atmosphere at the time of relocation or disposal, recover refrigerant by doing the cooling operation
cord or connec-
or forced cooling operation according to the following procedure. (When the cooling operation cannot start in winter, and so on, start the
tion cord
forced cooling operation.)
(1) Do the air purging of the charge hose by connecting the charging hose of gauge manifold to the charging port of 3-way valve (large) and
opening the low-pressure valve slightly.
(2) Close the valve stem of 3-way valve (small) completely.
(3) Start the cooling operation or following forced cooling operation.
When using the remote controller
Press the TEST RUN button after starting the cooling operation by the remote controller.
The operation indicator lamp and timer indicator lamp will begin to flash simultaneously during test run.
When using the MANUAL AUTO button of the indoor unit (The remote controller is lost, and so on.)
Keep on pressing the MANUAL AUTO button of the indoor unit for more than 10 seconds.
(The forced cooling operation cannot start if the MANUAL AUTO button is not kept on pressing for more than 10 seconds.)
(4) Close the valve stem of 3-way valve (large) when the reading on the compound pressure gauge becomes 0.05~0 MPa (0.5~0 kg/cm
(5) Stop the operation.
• Press the START/STOP button of the remote controller to stop the operation.
• Press the MANUAL AUTO button when stopping the operation from indoor unit side.
(It is not necessary to press on keeping for more than 10 seconds.)
During the pump-down operation, make sure that the compressor is turned off before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation 3-way valve open. This may cause abnormal pres-
sure in the refrigeration cycle that leads to breakage and even injury.
Install heat insulation around both the gas and liquid pipes. Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 248 °F (120 °C). (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is expected to exceed 70%, install heat
insulation around the refrigerant piping. If the expected humidity level is 70-80%, use heat insulation that is 9/16" (15 mm) or
thicker and if the expected humidity exceeds 80%, use heat insulation that is 13/16" (20 mm) or thicker.
If heat insulation is used that is not as thick as specified, condensation may form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less [at 68 °F (20 °C)].
Tightening torque
20 to 25 N·m (200 to 250 kgf·cm)
Gauge manifold
30 to 35 N·m (300 to 350 kgf·cm)
12.5 to 16 N·m (125 to 160 kgf·cm)
Blank cap
Hexagon wrench
Use a 3/16" (4 mm)
hexagon wrench.
3-way valve
Charging port
Service hose
CAUTION
Piping length
Additional charge
CAUTION
CAUTION
WARNING
Strip
3/8" (10 mm)
Wire
Wire
CAUTION
CAUTION
CAUTION
Use a clean gauge mani-
fold and charging hose
for R410A exclusively.
Lo
Hi
Vacuum pump
66ft
99ft
131ft
165ft
Rate
(20m)
(30m)
(40m)
(50m)
14.2oz
1lb 12oz
2lb 10oz
0.43oz/ft
None
(400g)
(800g)
(1200g)
(40g/m)
Gas
R410A
Liquid
Ring terminal
Sleeve
Screw with special washer
Ring terminal
Terminal board
Terminal block
Screw with special washer
Ring terminal
2
).
14/12/2558 13:50:04
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