Pumping Down - Mitsubishi Electric MXZ-4F83VFHZ Installation Manual

Split-type air-conditioner

Installation manual (160 pages)

4-6. 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.

Procedure

Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the power

supply.

• Correction completes in 10 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 (SW871)

again.

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

(SW871) again.

When the result is "Not completed", press the piping/wiring correction switch (SW871) 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

before operating this function.

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

4-7. 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.

• To feel cool / warm wind, use lower fan speed or reduce the number of indoor units in operation.

When many indoor units are being operated at the same time, capacity of each indoor unit may drop as shown in the graph below.

Operation when the total capacity of the operating indoor units is more than the capacity of the outdoor unit.

5. PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the system following 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) When the pressure gauge shows 0 – 0.05 MPa [Gauge] (approx. 0 – 0.5 kgf/cm

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

* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0 – 0.05 MPa [Gauge] (approx. 0 – 0.5 kgf/cm

tion 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 with 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.

When pumping down 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.

100%

67%

100%

Ratio of total indoor units capacity to outdoor unit capacity

WARNING

LED indication during detection:

LED1

LED2

(Red)