Error Code Abnormal point and detection method

Cause

Countermeasure

 

Freezing/overheating protection is

(Cooling or drying mode)

(Cooling or drying mode)

 

operating

Clogged filter (reduced airflow)

Check clogs of the filter.

 

Freezing protection (Cooling mode)

Short cycle of air path

Remove blockage.

 

The unit is in 6-minute resume prevention

Low load (low temperature)

 

 

mode if pipe <liquid or condenser/evapo-

operation out of the tolerance

 

 

rator> temperature stays under

 

 

range

 

 

the compressor started. Abnormal if it

Defective indoor fan motor

Refer to 9-6.

 

• Fan motor is defective.

 

 

 

 

 

again within 16 minutes after 6-minute

• Indoor controller board is defec-

 

 

resume prevention mode.

tive.

Check outdoor fan motor.

 

 

Defective outdoor fan control

 

 

Overcharge of refrigerant

Check operating condition of refrigerant

 

 

Defective refrigerant circuit

circuit.

 

 

(clogs)

 

 

Overheating protection (Heating mode)

(Heating mode)

(Heating mode)

 

Clogged filter (reduced airflow)

Check clogs of the filter.

 

The units is in 6-minute resume

 

Short cycle of air path

Remove blockage.

 

prevention mode if pipe <liquid or

 

Overload (high temperature)

 

P6

condenser/evaporator> temperature is

 

operation out of the tolerance

 

detected as over 70°C[158°F] after the

 

 

range

 

 

compressor started. Abnormal if the

 

 

Defective indoor fan motor

Refer to 9-6.

 

temperature of over 70°C[158°F] is

 

• Fan motor is defective.

 

 

detected again within 10 minutes after

 

 

• Indoor controller board is defec-

 

 

6 minute resume prevention mode.

 

 

tive.

 

 

 

 

 

 

Defective outdoor fan control

Check outdoor fan motor.

 

 

Overcharge of refrigerant

~ Check operating condition of refrigerant

 

 

Defective refrigerant circuit

circuit.

 

 

(clogs)

 

 

 

Bypass circuit of outdoor unit

 

 

 

is defective.

 

 

Pipe temperature

 

Slight temperature difference

~ Check pipe <liquid or condenser/evap-

 

 

<Cooling mode>

 

between indoor room

orator> temperature with room tempera-

 

Detected as abnormal when the pipe tem-

temperature and pipe <liquid

ture display on remote controller and

 

 

perature is not in the cooling range 3 min-

or condenser/evaporator>

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 set-

 

is out of cooling range.

 

• Disconnected holder of pipe

ting SW2 of outdoor controller circuit

 

 

Note 1) It takes at least 9 minutes to detect.

<liquid or condenser/

board as follows.

 

 

Note 2) Abnormality P8 is not detected in

evaporator> thermistor

 

)

 

drying mode.

 

• Defective refrigerant circuit

Conduct temperature check with outdoor

 

Cooling range : -

(TH-TH1)

Converse connection of

controller circuit board after connecting

 

TH: Lower temperature between liquid pipe

extension pipe (on plural units

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

 

temperature (TH2) and condenser/

connection)

 

 

 

evaporator temperature (TH5)

Converse wiring of indoor/

Check converse connection of extension

 

TH1: Intake temperature

 

outdoor unit connecting wire

pipe or converse wiring of indoor/outdoor

P8

<Heating mode>

 

(on plural units connection)

unit connecting wire.

 

 

Defective detection of indoor

 

 

 

When 10 seconds have passed after the

room temperature and pipe

 

 

 

compressor starts operation and the hot

<condenser/evaporator>

 

 

 

adjustment mode has finished, the unit is

temperature thermistor

 

 

 

detected as abnormal when condenser/

Stop valve is not opened

 

 

 

evaporator pipe temperature is not in heat-

completely.

 

 

 

ing 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 :

(TH5-TH1)

 

 

 

17

Page 17
Image 17
Mitsubishi Electronics PKA-A30KA4.TH, PKA-A36KA4.TH, PKA-A24KA4.TH service manual Operating, Pipe temperature

PKA-A36KA4.TH, PKA-A30KA4.TH, PKA-A24KA4.TH specifications

Mitsubishi Electronics introduces its PKA series of commercial air conditioners, comprising models PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH. These units are designed to meet the growing demand for energy-efficient and reliable climate control solutions in commercial spaces. Each model in the series is equipped with advanced features that set them apart in the competitive air conditioning market.

One of the main features of the PKA series is the innovative inverter technology. This technology enables the air conditioning units to adjust their cooling or heating output according to the indoor temperature, leading to significant energy savings. By operating at varying speeds rather than a constant rate, the inverter system provides a more consistent and comfortable environment while reducing energy consumption by up to 30% compared to traditional fixed-speed systems.

Another standout characteristic of the PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH models is their compact design. These units are designed for easy installation in various commercial settings while taking up minimal space. This is particularly beneficial for businesses looking to optimize their floor space without compromising climate control efficiency.

The PKA series features advanced filtration technology, including a highly efficient air purification system. This enhances indoor air quality by removing dust, allergens, and other airborne pollutants, creating a healthier environment for occupants. The inclusion of a self-cleaning function also contributes to maintenance ease, as the unit automatically cleans the heat exchanger, preventing dust buildup and ensuring efficient operation.

Mitsubishi's commitment to whisper-quiet operation is another critical feature of these models. They are engineered to operate at sound levels as low as 19 dB(A), making them ideal for environments where noise control is essential, such as offices, hotels, or healthcare facilities.

Moreover, the PKA series is compatible with Mitsubishi's sophisticated control systems, allowing users to manage their air conditioning remotely via smartphone or tablet. This level of control enhances user convenience and maximizes system efficiency by enabling real-time adjustments based on occupancy and other factors.

Overall, the Mitsubishi Electronics PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH units represent a perfect blend of modern technology and user-centric design, providing businesses with effective, efficient, and quiet climate control solutions. With their advanced features, energy-saving capabilities, and emphasis on air quality, these models stand out as premier choices for managing environmental comfort in commercial applications.