2.High pressure protection

During heating operation, the outdoor fan motor is controlled by the indoor coil thermistor RT12 temperature for excess rise protection of compressor discharge pressure.

Outdoor fan OFF : 52°C (MSH-07/09/12/24), 50°C (MSH-18)

Outdoor fan ON : 48°C (MSH-07/09/12/24), 46°C (MSH-18)

High pressure protection time chart

Indoor coil thermistor

RT12 temperature

52˚C(MSH-07/09/12/24) 50˚C(MSH-18)

48˚C(MSH-07/09/12/24) 46˚C(MSH-18)

Outdoor fan motor

ON

ON

OFF

OFF

 

Outdoor fan motor turn OFF

Outdoor fan motor turn ON

NOTE 1 :When the outdoor fan is OFF in heating, defrosting of outdoor heat exchanger is not detected by the defrost thermis- tor RT61.

NOTE 2 :When connected to MXZ-32NV- E1 outdoor unit,the MSH-07/09/12NV- E1 , MSH-07/09/12/18NV- E2 and

MSH-18NV- E3 indoor unit sends the data for the temperature to the outdoor unit according to the indoor coil temper- ature.For the further information,refer to the service manual No.OB185.

3. Defrostings

Defrostings of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61.

(1)Defrost starting conditions

When all conditions of a) ~ c) are satisfied, the defrosting operation starts.

a)Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting opera- tion working.

b)The defrost thermistor RT61 reads - 3°C or less.

c)After releasing the high pressure protection 4 minutes and 15 seconds have elapsed.

(2)Defrost terminating conditions

When the condition d) or e) is satisfied, the defrosting operation stops.

d)The defrost thermistor RT61 reads 3.1°C or more.

e)The defrosting time exceeds 10 minutes.

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Mitsubishi Electronics MSH-09NV, MSH-07NV, MSH-12NV, MSH-18NV High pressure protection, RT12 temperature, Defrostings

MSH-07NV, MSH-09NV, MSH-24NV, MSH-12NV, MSH-18NV specifications

Mitsubishi Electronics has long been recognized for its innovative heating and cooling solutions, particularly in the HVAC industry. Among its notable offerings are the MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models, which showcase advanced features and technologies to enhance indoor climate comfort.

One of the standout characteristics of these models is their energy efficiency. Each unit is equipped with an inverter technology that optimizes power consumption by adjusting the compressor's speed according to the cooling or heating requirement. This not only leads to considerable energy savings but also reduces operational costs for users. The units have received high seasonal energy efficiency ratings, making them an environmentally friendly choice.

The MSH series incorporates advanced filtration systems designed to improve indoor air quality. These systems capture dust, pollen, and other allergens, ensuring that the air circulated in residential or commercial spaces remains clean and healthy. Some models feature a dual-layer filter that further enhances dust and odor removal, providing a more comfortable environment for occupants.

In terms of design, the MSH series is sleek and modern, allowing seamless integration into various interiors. The compact size of these units means they can fit into tighter spaces without compromising performance or aesthetics. Moreover, the whisper-quiet operation is another appealing feature, as it ensures minimal noise disruption during cooling or heating periods.

The control mechanisms of the MSH models are user-friendly and versatile. They come equipped with an intuitive remote control, allowing users to easily adjust temperature settings and modes from across the room. Additionally, some models offer smart connectivity features, enabling integration with smart home systems for added convenience and control via mobile devices.

Durability is another key aspect of Mitsubishi's MSH series. They are constructed with high-quality materials designed to withstand various environmental conditions, ensuring longevity and reliable performance. The outdoor units are particularly resilient, featuring weather-resistant components that allow them to operate effectively even in extreme temperatures.

In conclusion, Mitsubishi Electronics' MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models represent a blend of energy efficiency, advanced air filtration, user-friendly controls, and durable construction. These units reflect Mitsubishi's commitment to providing high-quality heating and cooling solutions that cater to a wide range of residential and commercial needs while ensuring comfort and convenience for users.