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4-3. TEST RUN

• Test runs of the indoor units should be performed individually. See the installation manual coming with the

indoor unit, and make sure all the units operate properly.

• If the test run with all the units is performed at once, possible erroneous connections of the refrigerant

pipes and the indoor/outdoor unit connecting wires cannot be detected. Thus, be sure to perform the test

run one by one.

About the restart protective mechanism

Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3

minutes to protect the air conditioner.

Wiring/piping correction function

This unit has a wiring/piping correction function which corrects wiring and piping combination. When there

is possibility of incorrect wiring and piping combination, and confirming the combination is difficult, use this

function to detect and correct the combination by following the procedures below.

Make sure that the following is done.

• Power is supplied to the unit.

• Stop valves are open.

Note:

During detection, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not a mal-

function.

4-2. GAS CHARGE

Perform gas charge to unit.

1) Connect gas cylinder to the service port of stop valve.

2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.

3) Replenish specified amount of the refrigerant, while operating the air conditioner for cooling.

Note:

In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.

CAUTION:

When charging the refrigerant system with additional refrigerant, be sure to use liquid refrigerant.

Adding gas refrigerant may change the composition of the refrigerant in the system and affect

normal operation of the air conditioner. Also, charge the liquid refrigerant slowly, otherwise the

compressor will be locked.

To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under

140°F (40°C)) during cold season. But never use naked fire or steam.

Union

Stop valve

Liquid

pipe

Indoor

unit

Stop valve with

service port

Gas

pipe

Refrigerant gas

cylinder

operating valve

(for R40A)

Gauge manifold

valve (for R410A)

Charge hose

(for R40A)

Refrigerant gas cylinder for R40A with siphon

Electronic scale for refrigerant charging

Refrigerant (liquid)

Outdoor

unit

Union

Union
Union

Procedure

Press the piping/wiring correction switch (SW87) minute or more after turning on the power

supply.

• Correction completes in 0 to 20 minutes. When the correction is completed, its result is shown

by LED indication. Details are described in the following table.

• To cancel this function during its operation, press the piping/wiring correction switch (SW87)

again.

• When the correction completed without error, do not press the piping/wiring correction switch

(SW87) again.

When the result was “cannot be corrected”, press the piping/wiring correction switch (SW87)

again to cancel this function. Then, confirm the wiring and piping combination in a conventional

manner by operating the indoor units one by one.

• The operation is done while the power is supplied. Make sure not to contact parts other than

the switch, including the P.C. board. This may cause electric shock or burn by hot parts and

live parts around the switch. Contacting the live parts may cause P.C. board damage.

• To prevent electronic control P.C. board damage, make sure to perform static elimination be

fore operating this function.

• This function does not operate when the outside temperature is 32°F (0°C) or below.

4-4. EXPLANATION TO THE USER

• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to

remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.).

• Recommend the user to read the OPERATING INSTRUCTIONS carefully.

LED indication during detection:

LED

(Red)

LED2

(Yellow)

LED3

(Green)

Lighted

Once

Result of piping/wiring correction function