4)Treatment of Inverter and Compressor Troubles

If the compressor does not work when error codes 4240, 4250, 4340 or 4350 are detected, determine the point of malfunction by following the steps in the LED monitor display and countermeasures depending on the check code displayed, then perform the procedures below.

No.

Check Item

Symptoms

Treatment

 

 

 

 

 

 

 

 

How many hours was the

1 If it was kept on for 12 hours or

Go to [2].

 

 

1

power kept on before

longer as specified.

 

 

 

operation?

 

 

 

 

2 It was kept on for less than the

Go to [2] after keeping the power on for the

 

 

 

 

specified period.

specified time.

 

 

 

 

 

 

2

When it is restarted, does

1 The compressor stops and the

Perform the check of wiring shown in the

the trouble reappear?

same error code is displayed.

explanation of each error code.

 

 

 

 

 

3

Run the outdoor unit with

1 The Inverter stops and the same

Check the IPM is faulty. (Go to “Individual

 

the wiring to the compressor

error code is displayed.

Parts Failure Judgment Methods.”)

 

disconnected. At this time,

 

 

 

 

 

2 If the inverter’s output voltage is

Check the coil resistance and insulation

 

change SW1-1 on the INV

 

board to ON.

output with good balance, *1.

resistance of the compressor, and if it is

 

 

normal, run it again, and if the trouble occurs

 

Note) The terminals of the 3

 

 

 

again, replace the compressor.

 

disconnected wires should

 

 

 

* Insulation resistance

:

2MΩ or more

 

be isolated from each other.

 

 

 

Coil resistance

:

0.359 ~ 0.716Ω

 

 

 

 

 

 

 

 

 

 

 

3 If the balance in the inverter’s

Check the IPM.

 

 

 

 

output voltage is not good or if the

Judge that the IPM is faulty. (Go to “Indi-

 

 

inverter’s output voltages are all 0 V

vidual Parts Failure Judgment Methods.”)

 

 

(a digital tester cannot be used) *1.

If the IPM is normal, replace the G/A board,

 

 

 

then perform this item again with SW1-1 ON.

 

 

 

If the problem is not solved, replace the INV board.

 

 

 

If the problem is solved and you connect the

 

 

 

compressor again, turn SW1-1 OFF again.

 

 

 

Check the compressor’s coil resistance and

 

 

 

insulation resistance.

 

 

 

 

 

 

 

 

*1 [Cautions when measuring the voltage and current of the inverter’s power circuit.]

Since the voltage and current on the inverter’s power supply side and its output side do not have a sine waveform, the measurement values will differ depending on the measuring instrument and the circuit measured.

In particular, as the inverter’s output voltage has a pulse waveform, the output frequency also changes, so differences in measurement values will be great depending on the measuring instrument.

1When checking if the inverter’s output voltage is unbalanced or not (relative comparison of the voltages between each of the lines), if you are testing with a portable tester, be sure to use an analog tester.

Use a tester of a type which can be used to judge if the IPM or diode module is faulty.

In particular, in cases where the inverter’s output frequency is low, there are cases where the variations in measured voltage values between the different wires will be great when a portable digital tester is used, when in actuality they are virtually equal, and there is danger of judging that the inverter is faulty.

2It is recommended when checking the inverter’s output voltage values (when measuring absolute values), that, if a measuring device for business frequencies is used, a rectified voltage meter (with a symbol) be used.

Correct measurement values cannot be obtained with an ordinary portable tester. (either analog or digital)

–85–

Page 86 Page 88
Page 87
Image 87
Mitsubishi Electronics PURY-P400, P500YMF-C Again, replace the compressor, Vidual Parts Failure Judgment Methods
Page 86 Page 88

PURY-P400, P500YMF-C specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, known for its innovative technology and reliable performance. Among its notable offerings are the P500YMF-C and PURY-P400 models, designed to address the diverse needs of commercial and residential applications.

The Mitsubishi P500YMF-C is a high-performance outdoor unit that showcases energy efficiency and advanced refrigerant technology. It employs a sophisticated inverter-driven compressor, which optimizes energy usage by adjusting its speed based on the specific heating and cooling demands of the environment. This flexibility helps to minimize energy consumption while ensuring optimal comfort.

One of the standout features of the P500YMF-C is its ability to provide consistent heating and cooling even in extreme outdoor temperatures. The unit can operate effectively in low-temperature conditions, making it ideal for regions with harsh winters. Furthermore, the system is designed with a robust build, ensuring durability and longevity.

On the other hand, the PURY-P400 is an indoor multi-split system that complements the outdoor unit perfectly. It's designed for versatility and efficiency, capable of accommodating multiple indoor units connected to a single outdoor unit. This feature is particularly beneficial for larger spaces or buildings where different zones require individual climate control.

The PURY-P400 incorporates Mitsubishi's advanced filtration technology, which significantly improves indoor air quality. It features a multi-layer filtration system that effectively removes dust, allergens, and other particulates from the air, ensuring a healthier environment for occupants.

Both systems utilize R-32 refrigerant, which has a lower global warming potential compared to traditional refrigerants. This not only makes them more eco-friendly but also complies with emerging environmental regulations. The ease of installation and operation of these units is another noteworthy characteristic, with intuitive controls and user-friendly interfaces that facilitate seamless integration into existing systems.

In summary, the Mitsubishi P500YMF-C and PURY-P400 represent a fusion of technology, efficiency, and user-centric design. With a range of features aimed at enhancing performance and environmental sustainability, these models are an excellent choice for anyone looking to invest in a reliable and efficient HVAC system. Whether for residential or commercial use, Mitsubishi’s offerings continue to set the standard in comfort and efficiency.
Top Page Image Contents