Test Run; Relocation And Maintenance; Pumping Down - Mitsubishi Electric MXZ-4B80VA Installation Manual

4-6. TEST RUN

• Be sure to perform the test run for each unit. Make sure each indoor unit op-
erates properly following the installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect any
erroneous connection, if any, of the refrigerant pipes and the indoor/outdoor
unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the com-
pressor 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
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 be-
low.
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 fil-
ters, 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. RELOCATION AND MAINTENANCE

5-1. 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 atmos-
phere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it can be easily closed fully when the pressure gauge shows 0
MPa [Gauge] (0 kgf/cm
4) Start the emergency COOL operation on all the indoor units.
To start the emergency operation in COOL mode, disconnect the power supply plug and/or turn off the breaker. After 15 seconds, connect the power
supply plug and/or turn on the breaker, and then press the E.O. SW once. (The emergency COOL operation can be performed continuously for up to 30
minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
6) Stop the emergency COOL operation.
Press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details .
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
8
2
).
WARNING
LED indication during detection:
LED
1 (Red) 2 (Yellow) 3 (Green)
Lighted Lighted Blinking
Result of piping/wiring correction function
LED
1 (Red) 2 (Yellow) 3 (Green)
Completed
Lighted Not lighted Lighted
(Corrected successfully)
Blinking Blinking Blinking Cannot be corrected
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
Other indications
FLASHES" located behind
the service panel.
Result
2
).