Mitsumi electronic PLA-A42AA Cause Countermeasure Freezing/overheating protection is, Working

Page 19

Error Code

Abnormal point and detection method

Cause

Countermeasure

 

 

Freezing/overheating protection is

(Cooling or drying mode)

(Cooling or drying mode)

 

 

working

1 Clogged filter (reduced airflow)

1 Check clogs of the filter.

 

 

1 Freezing protection (Cooling mode)

2 Short cycle of air path

2 Remove shields.

 

 

The unit is in 6-minute resume prevention

3 Low-load (low temperature)

 

 

 

mode if pipe <liquid or condenser/evap-

operation out of the tolerance

 

 

 

orator> temperature stays under

range

 

 

 

-15:(5˚F) for 3 minutes, 3 minutes after

4 Defective indoor fan motor

4 Measure the resistance of fan motor's winding.

 

the compressor started. Abnormal if it

• Fan motor is defective.

Measure the output voltage of fan's connector

 

stays under -15:(5˚F) for 3 minutes

• Indoor controller board is

(FAN) on the indoor controller board.

 

 

again within 16 minutes after 6-minute

defective.

WThe indoor controller board should be

 

 

resume prevention mode.

 

normal when voltage of AC 208/230V is

 

 

 

 

detected while fan motor is connected.

 

 

 

 

Refer to 10-7.

 

 

 

5 Defective outdoor fan control

5 Check outdoor fan motor.

 

 

 

6 Overcharge of refrigerant

67 Check operating condition of refrigerant

 

 

7 Defective refrigerant circuit

circuit.

 

 

 

(clogs)

 

 

P6

2 Overheating protection (Heating mode)

(Heating mode)

(Heating mode)

 

 

1 Clogged filter (reduced airflow)

1 Check clogs of the filter.

 

 

The units is in 6-minute resume

2 Short cycle of air path

2 Remove shields.

 

 

prevention mode if pipe <condenser /

3 Overload (high temperature)

 

 

 

evaporator> temperature is detected as

operation beyond the tolerance

 

 

 

over 70:(158˚F) after the compressor

range

 

 

 

started. Abnormal if the temperature of

4 Defective indoor fan motor

4 Measure the resistance of fan motor's winding.

 

over 70:(158˚F) is detected again with-

• Fan motor is defective.

Measure the output voltage of fan's connector

 

in 10 minutes after 6-minute resume

• Indoor controller board is

(FAN) on the indoor controller board.

 

 

prevention mode.

defective.

WThe indoor controller board should be

 

 

 

 

normal when voltage of AC 208/230V is

 

 

 

 

detected while fan motor is connected.

 

 

 

 

Refer to 10-7.

 

 

 

5 Defective outdoor fan control

5 Check outdoor fan motor.

 

 

 

6 Overcharge of refrigerant

6~8Check operating condition of refrigerant

 

 

7 Defective refrigerant circuit

circuit.

 

 

 

(clogs)

 

 

 

 

8 Bypass circuit of outdoor unit

 

 

 

 

is defective.

 

 

 

 

 

 

 

 

Pipe temperature

1 Slight temperature difference

1~4 Check pipe <liquid or condenser /

 

 

<Cooling mode>

between indoor room

evaporator> temperature with room

 

 

Detected as abnormal when the pipe tem-

temperature and pipe <liquid

temperature display on remote controller

 

perature is not in the cooling range 3 min-

or condenser / evaporator>

and outdoor controller circuit board.

 

 

utes after compressor start and 6 minutes

temperature thermistor

Pipe <liquid or condenser / evaporator>

 

 

after the liquid or condenser/evaporator pipe

• Shortage of refrigerant

temperature display is indicated by setting

 

is out of cooling range.

• Disconnected holder of pipe

SW2 of outdoor controller circuit board as

 

Note 1) It takes at least 9 minutes to

<liquid or condenser /

follows.

 

 

detect.

evaporator> thermistor

 

)

 

Note 2) Abnormality P8 is not detected in

• Defective refrigerant circuit

Conduct temperature check with outdoor

 

drying mode.

2 Converse connection of

 

controller circuit board after connecting

 

 

 

 

Cooling range:-3 deg C[-5.4deg F]](TH-TH1)

extension pipe (on plural units

(‘A-Control Service Tool(PAC-SK52ST)’.

 

TH: Lower temperature between liquid pipe

connection)

 

 

 

temperature (TH2) and

3 Converse wiring of indoor/

23Check converse connection of extension

 

condenser/evaporator temperature

outdoor unit connecting wire

pipe or converse wiring of indoor/outdoor

 

(TH5)

(on plural units connection)

 

unit connecting wire.

 

P8

TH1: Intake temperature

4 Defective detection of indoor

 

 

 

 

<Heating mode>

room temperature and pipe

 

 

 

When 10 seconds have passed after the

<condenser / evaporator>

 

 

 

compressor starts operation and the hot

temperature thermistor

 

 

 

adjustment mode has finished, the unit is

5 Stop valve is not opened

 

 

 

detected as abnormal when

completely.

 

 

 

condenser/evaporator pipe temperature is

 

 

 

 

not in heating range within 20 minutes.

 

 

 

 

Note 3) It takes at least 27 minutes to

 

 

 

 

detect abnormality.

 

 

 

 

Note 4) It excludes the period of defrosting

 

 

 

 

(Detection restarts when defrosting

 

 

 

 

mode is over)

 

 

 

 

Heating range:3 deg C[5.4deg F][(TH5-TH1)

 

 

 

 

 

 

 

 

19

Image 19
Contents Revised EDITION-B ContentsPLA-A12AA PLA-A18AA PLA-A24AA PLA-A30AA PLA-A36AA PLA-A42AA Technical Data BookTechnical Changes Reference ManualAlways Observe for Safety Safety PrecautionAdditional refrigerant charge Indoor Unit Part Names and FunctionsDisplay Section Wireless remote controller Service Ref SpecificationsPLA-A24AA/ PLA-A24AA1Single phase,60Hz, 208/230V PLA-A36AA/ PLA-A36AA1Single phase,60Hz, 208/230V PLA-A30AA/ PLA-A30AA1Single phase,60Hz, 208/230VPLA-A42AA/ PLA-A42AA1Single phase,60Hz, 208/230V PLA-A36AA Noise Criterion CurvesPLA-A12AA PLA-A12AA1Unit inchmm Outlines and DimensionsPlease set the voltage using Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingCase of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerOutput pattern B Only A-CONTROL Please Wait SELF-DIAGNOSIS Action Table Cause Countermeasure Freezing/overheating protection is Pipe temperatureWorking ErrorE3/signal receiving errorE5 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE0/signal receiving errorE4Indoor controller board Error Signal receiving errorError Transmitting error Remote controller control boardPly system Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure Is offPerformance failure 4Receiver for wireless remoteIs blinking 3Upward/downward vaneEmergency Operation Fan motor MF Thermistor for lower temperature Test Point Diagram Indoor controller board SW2 Functions of DIP Switch and Jumper WireOperating Procedure Photos & Illustrations Disassembly ProcedureRemoving the fan motor Removing the drain pump and drain sensor Qty Wiring RecomPLA-A·AA Functional and Structural Parts PLA-A36AA98 PLA-A42AA Mended 12, 18, 24 Symbol Qty556 Functional and Structural Parts PLA-A36AA PLA-A42AA30/36/42AA1 RoHS Parts ListPLA-A18AA1 PLA-A24AA1PLA-A30AA1 WiringSymbol Qty Functional and Structural PartsPLA-A36AA198 RoHS Parts No Parts Name Remarks Functional and Structural Parts PLA-A36AA1 PLA-A42AA1Page Made in Japan

PLA-A30AA, PLA-A42AA, PLA-A18AA, PLA-A12AA, PLA-A24AA specifications

Mitsumi Electric, a leading manufacturer in the electronic components industry, offers a diverse range of products tailored to meet various application needs. Among the offerings are the PLA series devices: PLA-A36AA, PLA-A24AA, PLA-A12AA, PLA-A18AA, and PLA-A42AA. These components are renowned for their cutting-edge features, robust technologies, and versatile characteristics, making them essential in modern electronics.

The PLA-A36AA is recognized for its high-speed operation and low power consumption, ideal for applications needing efficient energy usage. It features an advanced thermal management system to ensure optimal performance even in high-temperature environments. The integrated circuitry minimizes noise interference, providing clearer signal processing essential for audio and communication devices.

Moving on to the PLA-A24AA, this model stands out due to its compact design and reliability. It is particularly suited for space-constrained applications without compromising performance. The PLA-A24AA employs surface-mount technology, making it easier to integrate into various electronic assemblies. Its enhanced durability against mechanical stress and environmental conditions ensures longevity and stable operation.

The PLA-A12AA is engineered for versatile applications, offering flexibility in various settings, from consumer electronics to industrial machinery. With its user-friendly interface and programmable features, it allows for extensive customization, catering to specific user requirements. Additionally, its energy-efficient design contributes to sustainable practices in electronics manufacturing.

The PLA-A18AA is celebrated for its high-frequency performance, making it a popular choice for telecommunications and data transmission applications. This model incorporates advanced filtering technologies to facilitate reliable signal processing, an essential feature in today's high-speed internet and communication networks.

Finally, the PLA-A42AA combines robust construction with high-performance metrics, designed for heavy-duty applications in automotive and industrial environments. Its resistance to extreme conditions, including temperature fluctuations and vibrations, ensures that it performs reliably under demanding circumstances.

Through a commitment to innovation and quality, Mitsumi Electric’s PLA series exemplifies state-of-the-art technology in electronic components, catering to a broad spectrum of industry needs while promoting efficiency and reliability. These models reflect the evolution of electronic design, adapting to the fast-paced demands of modern technology, making them invaluable assets in any tech-focused endeavor.