Manuals / Mitsubishi Electronics / Household Appliance / Air Conditioner

Mitsubishi Electronics U1, MUZ-D36NA, MUY-D36NA Check of compressor start failure, Check of LEV

Models: MUY-D36NA MUZ-D30NA U1 MUY-D30NA MUZ-D36NA

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F Check of compressor start failure

Confirm that 1~4 is normal. •Electrical circuit check

1.Contact of lead wire leading to compressor

2.Output voltage of the outdoor electronic control P.C. board and balance of them (See 10-5.)

3.Direct current voltage to the outdoor electronic control P.C. board

4.Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

No

After the compressor is heated with a drier, does the compressor start? 1

Yes

 

 

Check the refrigerant circuit.

Yes

 

Check the stop valve.

 

 

 

 

 

Replace the compressor.

No

 

Compressor start failure. Activate pre-heat control. (Refer to 9-1. "PRE-HEAT CONTROL")

1

Heat the compressor with

a drier for about 20 minutes. Do not recover refrigerant gas while heating.

Heating part

When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm.

G Check of LEV

Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.

Is "click - click" sound heard?

Or, do you feel vibration of the LEV coil with a hand? No

Disconnect the connector CN795.

Is there normal resistance to LEV coil?

No

Replace the LEV coil.

 

 

Normal

Yes

 

 

 

Replace the outdoor electronic

Yes

 

control P.C. board.

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Mitsubishi Electronics U1, MUZ-D36NA, MUY-D36NA, MUZ-D30NA, MUY-D30NA Check of compressor start failure, Check of LEV
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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.