Pumping Down - Mitsubishi Electric MXZ-3DM50VA Notice D'installation

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4-4. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)

• Description of the function:

With this function, once the operation mode is locked to either COOL/DRY mode

or HEAT mode, the air conditioner operates in that mode only.

* Changing the setting is required to activate this function. Please explain about

this function to your customers and ask them whether they want to use it.

[How to lock the operation mode]

1) Be sure to turn off the main power for the air conditioner before making the

setting.

2) Set the "1" of SW2 on the outdoor controller board to ON to enable this function.

3) To lock the operation mode in COOL/DRY mode, set the "2" of SW2 on the

outdoor controller board to OFF. To lock the operation in HEAT mode, set the

same switch to ON.

4) Turn on the main power for the air conditioner.

4-5. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT

• Description of the function:

With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example, during nighttime in COOL mode.

However, please note that the cooling and heating capacity may lower if this function is activated.

* Changing the setting is required to activate this function. Please explain about this function to your customers and ask them whether they want to use it.

[How to lower the operating noise]

1) Be sure to turn off the main power for the air conditioner before making the setting.

2) Set the "3" of SW2 on the outdoor controller board to ON to enable this function.

3) Turn on the main power for the air conditioner.

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 combi-

nation, 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 malfunction.

Procedure

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

power supply.

• Correction completes in 10 to 15 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 was "cannot be corrected", 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.

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 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm

stop the 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 0.05 MPa [Gauge] (approx. 0.5 kgf/cm

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.

), fully close the stop valve on the gas pipe side of the outdoor unit and

WARNING

COOL/DRY

HEAT

Lower the operating noise

LED indication during detection:

LED1

LED2

LED3