Service Functions | Mitsubishi Electronics MUY-D30NA, MUZ-D36NA, U1

9 SERVICE FUNCTIONS

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

9-1. PRE-HEAT CONTROL

If moisture gets into the refrigerant cycle, or when refrigerant is liqueﬁed and col- lected in the compressor, it may interfere the start-up of the compressor.

To improve start-up condition, the compressor is energized even while it is not operating.

This is to generate heat at the winding.

The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is ON at initial setting.

[How to activate pre-heat control]

1.Turn OFF the power supply for the air conditioner before making the setting.

2.Set the 2nd Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to activate pre-heat control function.

The compressor is energized even while it is not operating.

This is to generate heat at the winding to improve the compressor's start-up condition.

1 2 3 4

Power ON

OFF

Compressor ON

OFF

Outside temperature 68 °F (20 °C)

30min.

30min. 15min. 30min. 15min. 30min.

Pre-heat ON

OFF

Breaker ON	Start	Stop	When outside
	operation	operation	temperature is
			above 68 °F
			(20 °C)

1.Pre-heat control is turned ON for 15 or 30 min. after the breaker is turned ON.

2.30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 min. and turned OFF for 30 min. This is repeated as shown in the graph until the breaker is turned OFF.

When outside temperature is 68 °F (20 °C) or below , pre-heat control is ON for 30 min. When outside temperature is 70 °F (21 °C) or above, pre-heat control is ON for 15 min.

NOTE: When the unit is started with the remote controller, pre-heat control is turned OFF. Compressor uses 50 W when pre-heat control is turned ON.

9-2. CHANGE IN DEFROST SETTING

Changing defrost finish temperature

1.Turn OFF the power supply for the air conditioner before making the setting.

2.Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to change the defrost finish temperature. (Refer to 10-6-1.)

1 2 3 4

	4th Dip Switch of SW1	Defrost ﬁnish temperature

	OFF	49.5 °F (9.7 °C)
	(Initial setting)	49.5 °F (9.7 °C)
	(Initial setting)
	ON	64.9 °F (18.3 °C)

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.

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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.