Fan motor does not operate or stops operating shortly after starting the operation.

D Check of outdoor fan motor

Check the connection between the connector CN931 and CN932.

Is the resistance between each ter-

minal of outdoor fan motor normal? Yes (Refer to 10-4.)

No

(Fixed to either 5 or 0 VDC) No

No

Replace the outdoor DC fan motor.

Disconnect CN932 from outdoor electronic control P.C. board, and turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage of CN931.

Between 1(+) and 5(-)

Between 2(+) and 5(-)

Between 3(+) and 5(-)

Does the voltage between each terminal become 5 VDC and 0 VDC repeatedly?

Yes

Does the outdoor fan motor rotate smoothly?

Yes

Replace the outdoor electronic control P.C. board.

Outdoor unit does not operate.

E Check of power supply

Check the connecting of parts of main power supply circuit.

Turn ON power supply.

Is there voltage of 208 / 230 VAC in the power supply terminal block?

Yes

Is the output voltage from the noise filter P.C. board 208 / 230 VAC?

Yes

Is the input voltage to the power board 208 / 230 VAC?

Yes

 

 

Check the power supply cable.

No

 

 

 

Replace the noise filter P.C. board.

No

 

 

 

Replace the reactor.

No

 

Is the input voltage to the outdoor electronic

 

 

 

 

 

Replace the power board.

control P.C. board 294 / 325 VDC?

No

 

 

Yes

 

 

 

 

 

 

 

 

Replace the outdoor electronic control P.C. board.

31

Page 31
Image 31
Mitsubishi Electronics MUY-D36NA, MUZ-D36NA, U1, MUZ-D30NA, MUY-D30NA Check of outdoor fan motor, Check of power supply

MUY-D36NA, MUZ-D30NA, U1, MUY-D30NA, MUZ-D36NA specifications

Mitsubishi Electronics has long been at the forefront of innovation in heating and cooling solutions, and its latest lineup of multi-zone air conditioning units—MUZ-D36NA, MUY-D30NA, U1, MUZ-D30NA, and MUY-D36NA—reflects this commitment to quality and efficiency. Designed for both residential and commercial applications, these units offer advanced features that enhance comfort and energy savings.

One of the standout characteristics of these models is their energy efficiency. Each unit is equipped with high SEER (Seasonal Energy Efficiency Ratio) ratings, making them ideal for users looking to reduce energy consumption while maintaining optimal indoor climates. The efficiency is complemented by inverter technology, which allows the compressor to adjust its speed based on the cooling demand. This results in a smoother operation, reduced noise levels, and significant energy savings over time.

These units also feature advanced filtration systems that improve indoor air quality. The included high-performance air filters capture dust, allergens, and other particles, ensuring that occupants breathe cleaner air. Additionally, some models are equipped with a plasma filtration system that actively neutralizes odors and airborne contaminants, making them particularly suitable for allergy sufferers.

Mitsubishi's advanced climate control technologies set these models apart. The system can be easily controlled using a user-friendly remote or via a mobile app, offering convenience and flexibility. The intelligent temperature control ensures that rooms are heated or cooled consistently, regardless of external conditions.

Installation versatility is another highlight. These units can be configured for multi-zone systems, allowing for tailored comfort in different spaces. The compact and sleek design makes them suitable for various installations, whether in homes, offices, or retail environments.

Furthermore, the MUZ-D and MUY-D series are equipped with quiet operation features, ensuring minimal disruption in both residential and commercial settings. This is particularly beneficial in spaces where noise could be a concern, such as bedrooms or conference rooms.

In summary, Mitsubishi's MUZ-D36NA, MUY-D30NA, U1, MUZ-D30NA, and MUY-D36NA offer a powerful combination of energy efficiency, advanced filtration, intelligent controls, and quiet operation. These features make them an excellent choice for anyone looking to enhance indoor comfort while minimizing environmental impact. Whether it's for a single room or an entire building, these units are engineered to deliver reliable performance year-round.