Pumping Down - Mitsubishi Electric MXZ-3C24NA Notice D'installation

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 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.

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 0.1 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.)
* If 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 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.
En-7
WARNING
LED indication during detection:
LED
1 (Red) 2 (Yellow) 3 (Green)
Lighted Lighted Once
Result of piping/wiring correction function
LED
1 (Red) 2 (Yellow) 3 (Green)
Completed
Lighted Not lighted Lighted
(Corrected successfully)
Once Once Once Cannot be corrected
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
Other indications
FLASHES" located behind
the service panel.
Result