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37

• Pump down operation
• Operate the pump down according to the following procedures.

• Connect the power supply wiring and indoor/outdoor unit

connection wiring according to the electrical circuit diagram
instructions.

• Clamp the wires securely to the terminal connections using

cord clamps so that no undue force is placed on the wires.

1. Connect the power supply line to a single-phase 220 –

240V power supply.

2. The equipment shall be connected to a suitable mains

network with a main impedance less than the valve
indicated in the table of power supply specifications.

3. Be sure to connect the wires correctly to terminal board

with connecting the crimp type ring terminal to the wires.

4. The binding screws inside the power supply box may

become loosened due to vibration during transportation,
so check that they are tightened securely.

5. Tighten the binding screws to the specified torque while

referring to the table below.

6. If connecting two separate wires to a single crimped

terminal, place the two crimped terminal wires together as
shown in Fig. A. (If the arrangement shown in Fig. B is
used, poor contacts or contact damage may result.)

7. If momentarily turning on the power supply for both the

indoor and outdoor units, do not turn the power off again
until at least 1 minute has passed (except when a
reversed phase has been detected).

Procedure

Notes

1. Confirm the valve on the liquid side and the gas side is surely open.
2. Press the PUMP DOWN switch on outdoor printed board for 1 sec-

ond or more.

Perform the cooling operation for five minutes or more.

3. Shut the valve on the liquid side surely.

When the valve is shut halfway, the compressor is occasionally 
damaged.

The units must be connected to the supply cables for fixed wiring by qualified technician.
Feed the power source to the unit via a distribution switch board designed for this purpose, the switch should
disconnected all poles with a contact separation of at least 3mm.
When the supply cable is damaged, it must be replaced by qualified technician.
Be sure to install a current leakage breaker, main switch and fuse to the main power supply, otherwise electric shocks
may result.
Be sure to connect the unit to secure earth connection.
If the earthing work is not carried out properly, electric shocks may result.

Wiring shall be connected securely by using specified cables and fix them securely so that external force of the cables
may not transfer to the terminal connection section.
Imperfect connection and fixing leads to fire, etc.

Use only the specified cables for wiring connections. Connect the cable securely, and secure them properly so that
no undue force will be applied to the terminal connections.
If the terminals are loose or if the wires are not connected securely, fire may result.

Terminal screw

Tightening torque N•cm {kgf•cm}

M3

69~98 {7~10}

M4

157~196 {16~20}

38

Earth lead wire shall be longer than other lead wires as shown
in the figure for the electrical safety in case of the slipping out of
the cord from the anchorage.

• Power supply specifications

Model name

Leakage

current

breaker (A)

Circuit breaker

(Minimum Capacity)

Minimum 

power

supply cables

4mm

2

cable

based on

length (m)

Indoor/outdoor unit connection 

power cables

(terminals

)

Switch (A)

Fuse (A)

CU-YL24HB*** 220/230/240V~

30

30

20

4mm

2

14

2.5mm

2

 x 4

CU-YL28HB*** 220/230/240V~

30

30

20

14

NOTE

1. Where ground work (earth) is carried out, do not connect the ground return to the gas pipe, water line pipe, grounded circuit of

the telephone and lightning rod, or ground circuit of other product in which earth leakage breaker is incorporated. (Such action is
prohibited by statute, etc.)

Make sure the indoor and outdoor connection wires are detangled. (There might be effect to received outside noise.)

2. Use the standard power supply cables for Europe (such as H05RN-F or H07RN-F which conforms to CENELEC (HAR) rating

specifications) or use the cables based on IEC standard. (245IEC57, 245IEC66)

3. Select the particular size of electrical wire for power supply cables in accordance with the standards of the given nation and

region.

39

• Setting of Cooling only model

[Setting method]
When the equipment is not power ON, cut off JP1 (COOL
ONLY) as shown in Figure 1.
After cut off the wire, switch ON the equipment power.
By setting to cooling only model, Heating operation is disabled.
(Wired remote controller cannot show heating display,
Wireless remote controller cannot accept heating operation.)
Besides ODOUR WASH operation is disabled. (Odor cut
operation is still enabled.)
When want to return cooling only setting model to heat pump
model, switch OFF the equipment power, connect JP1 (COOL
ONLY) back to short circuit condition and switch ON the
equipment power.

• Always be sure to use a properly-insulated tool to operate

the switch on the circuit board.
(Do not use your finger or a metallic object.)

• Never turn on the power supply until all installation work has

been completed.

• Turn on the circuit-breaker 12 hours or more before a test

run. (By supplying power to crankcase heater, compressor is
warmed and liquid compressing is prevented.)

• Check that the voltage is 90% of rated voltage or higher

when starting the unit.
(The unit will not operate if the voltage is less than 90% of
rated voltage.)

• Test operation can be carried out using the remote control

unit or by using the switch on the printed circuit board inside
the outdoor unit.
If carrying out test operation at the printed circuit board of
the outdoor unit, follow the procedure given below. (If using
the remote control unit to carry out test operation, refer to
the installation manual which is supplied with the indoor
unit.)

• Press the COOLING TEST or HEATING TEST switch for 1

second or more.
(Be sure to select cooling mode first, and run the units in this
mode for 7 minutes or more.)

• Press the TEST button once more to cancel test operation

mode.

• When performing heating test operation when the outside

temperature is high, or cooling test operation when the
outside temperature is low, the protection circuits may some-
times operate within a few minutes.

Can the equipment set to cooling only model by setting JP
line on outdoor unit display circuit board?

The equipment can be set to cooling only model by setting
the JP line on the outdoor unit display circuit board.

CAUTION

NOTE 1

These units are equipped with connection error prevention circuits. If the units do not operate, it is possible that the connection
error prevention circuits have been operated. In such cases, check that the Indoor/outdoor unit connection wire (connected to
terminals 

,   and  ) is connected correctly. If they are connected incorrectly, connect them correctly.

Normal operation should then commence.

40

• At the time when the work has been completed, measure and record the characteristics of test run without fail and keep the

measuring date, etc.

• Carry out the measurement regarding room temperature outside air temperature, suction and air discharge temperatures, wind

velocity, wind volume, voltage current, presence of abnormal vibration, operating pressure, piping temperature, compressive
pressure, airtight pressure as items to be measured.

• As to the structure and appearance, check following items.

• Request the customer to operate this air conditioner viewing instruction manual come with indoor unit in practice and explain

how to operate.

• Deliver the instruction manual to the customer without fail.

NOTE 2

Do not short the remote control unit wires to each other. (The protection circuit will be activated and the units will not operate.) 
Once the cause of the short is eliminated, normal operation will then be possible.

NOTE 3

When running the units in heating mode during test operation, be sure to run the units in cooling mode first before selecting this 
mode. If heating mode is selected first, it may cause problems with operation of the compressor.

NOTE 4

Test operation should be carried out for a minimum of 7 minutes. (Test operation will be cancelled automatically after 30 
minutes.)

NOTE 5

Test operation mode should always be cancelled once test operation itself has been completed.

NOTE 6

If the self-diagnosis function reports a problem but more than one problem has developed at the indoor and/or outdoor units, the 
problem display on the remote control unit may not match the LED display on the outdoor unit printed circuit board. In such 
cases, check both locations and remove the causes of the problems.

Short circuit of the blow-out air

Mistake in wiring

Smooth flow of the drain

Reliable connection of the grand wire

Reliable thermal insulation

Looseness in terminal screw, fastening torque

Leakage of refrigerant

 M3… 69-98N•cm{7-10kgf•cm} M4…157-196N•cm{16-20kgf•cm}