Pumping Down - Mitsubishi Electric MXZ -2C20 NA2 Manual De Instalación

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4-6. TEST RUN

• Test runs of the indoor units should be performed individually. See the installation manual coming ith the indoor unit, and make sure all the units operate properly.

• If the test run ith all the units is performed at once, possible erroneous connections of the refrigerant pipes and the indoor/outdoor unit connecting ires 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 ill not operate for 3 minutes to protect the air conditioner.

W iring/piping correction function

This unit has a w iring/piping correction function w hich corrects w iring and piping combination. W hen there is possibility of incorrect w iring and piping combination,

and confirming the combination is difficult, use this function to detect and correct the combination by follo ing the procedures belo .

Make sure that the follo ing is done.

• Po er 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.

Procedure

Press the piping/w iring correction sw itch (SW 871) 1 minute or more after turning on the pow er

supply.

• Correction completes in 10 to 15 minutes. When the correction is completed, its result is sho n

by LE D indication. Details are described in the follow ing table.

• To cancel this function during its operation, press the piping/ iring correction s itch (SW871)

again.

• When the correction completed ithout error, do not press the piping/ iring correction s itch

(SW 871) again.

When the result is "Not completed", press the piping/ iring correction s itch (SW871) again to

cancel this function. Then, confirm the iring and piping combination in a conventional manner by

operating the indoor units one by one.

• The operation is done hile the po er is supplied. Make sure not to contact parts other than

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

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

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

operating this function.

• This function does not operate hen the outside temperature is 0 C or belo .

4-7. EXPLANATION TO THE USER

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

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

• Recommend the user to read the OPERATING INSTRUCTIONS carefully.

5. PUMPING DOW N

W hen relocating or disposing of the air conditioner, pump dow n the system follow ing the procedure below so that no refrigerant is released into the atmosphere.

1) Turn off the breaker.

2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

3) Fully close the stop valve on the liquid pipe side of the outdoor unit.

4) Turn on the breaker.

5) Start the emergency COOL operation on all the indoor units.

6) W hen the pressure gauge show s 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation. (Refer

to the indoor unit installation manual about the method for stopping the operation.)

* I f too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), or the protection function

may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in

the system, and then recharge the system ith the correct amount of refrigerant after the indoor and outdoor units have been relocated.

7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.

W hen pumping dow n the refrigerant, stop the compressor before disconnecting the refrigerant pipes.

The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.

E n-7

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WARNING

LED indication during detection:

LE D1

LE D2

LE D3

(Red)