4. Service procedures

4-3. Details of Alarm Messages

(1) [Alarm “P29”]

Input power detection circuit trouble

(MDC trouble)

Compressor does not run.

 

 

Breakdown

 

Motor current detection circuit trouble

 

Is power OK?

No

Correct power line.

 

 

 

Yes

 

 

 

 

Is

 

 

 

 

current

No

Check and correct

 

detection

 

circuit wiring

 

wiring.

 

 

OK?

 

 

 

 

Are

 

 

 

 

wiring and

No

Check and correct

 

connector

 

 

wiring.

 

 

connections

 

 

 

 

 

 

 

OK?

 

 

 

 

Yes

 

 

 

 

Is

No

 

 

 

compressor

 

 

 

 

 

 

 

OK?

 

 

Yes

 

 

 

Ground

 

 

 

 

 

Yes

 

fault?

 

 

 

 

 

 

 

 

Coil

Yes

 

 

 

resistor

 

 

 

short circuit?

 

 

 

 

Coil open

Yes

 

 

 

 

 

 

 

circuit?

 

 

 

 

No

 

 

Is there

No

Replace

 

 

 

 

abnormal refrigerant

 

4

 

compressor.

accumulation?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Is

 

Are

 

 

 

 

 

operation of

No

No

 

C1 and TS

 

electronic

 

 

sensors

 

 

control valve

 

 

 

 

OK?

 

 

OK?

 

 

 

 

 

 

 

Yes

 

Replace electronic

 

 

 

 

 

 

control valve.

 

Is there overload?

No

Remove

 

 

 

the cause.

 

 

 

 

 

Yes

Replace outdoor unit control PCB.

Replace compressor.

Replace C1 and TS sensors.

4-8

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Panasonic R410A service manual Service procedures Details of Alarm Messages, Alarm P29, MDC trouble
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R410A specifications

Panasonic R410A is a refrigerant that has gained significant popularity in the air conditioning and refrigeration industry due to its favorable environmental properties and performance characteristics. Specifically designed to replace the harmful R22 refrigerant, which is being phased out due to its ozone-depleting potential, R410A offers a more eco-friendly alternative without compromising on efficiency or power.

One of the main features of R410A is its high energy efficiency. It operates at a higher pressure than R22, resulting in better heat transfer capabilities. This increased efficiency translates to lower energy consumption, making units using R410A more cost-effective in the long run. Additionally, R410A is known for its ability to provide excellent cooling performance even in high-temperature environments, making it suitable for a variety of applications, from residential air conditioning systems to commercial refrigeration units.

In terms of composition, R410A is a blend of two hydrofluorocarbons (HFCs), namely R32 and R125. This combination not only minimizes ozone depletion potential (ODP) but also reduces global warming potential (GWP) compared to older refrigerants. Panasonic has emphasized the importance of innovative technologies in its products, and R410A aligns perfectly with the company's commitment to developing sustainable solutions.

Panasonic also integrates advanced technologies to optimize the performance of R410A systems. For example, variable speed compressors, known as inverter technology, enhance system efficiency by adjusting the compressor's speed according to the cooling demand. This ensures that energy is only consumed when needed, further reducing operational costs.

Furthermore, R410A has a wide range of applications, including air conditioning systems, heat pumps, and chillers. Its versatility makes it a popular choice among manufacturers and consumers alike. The refrigerant is also compatible with existing R22 equipment, although specific retrofit procedures must be followed to ensure peak performance and reliability.

In conclusion, Panasonic R410A stands out as an innovative refrigerant choice in the HVAC industry, offering a combination of energy efficiency, environmentally friendly properties, and advanced technologies. As regulatory frameworks continue to tighten on greenhouse gas emissions, R410A and similar refrigerants are expected to play a crucial role in shaping a more sustainable future for air conditioning and refrigeration. Its high performance and lower environmental impact solidify its position as a leading refrigerant in contemporary cooling solutions.
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