2-9. EXPANSION VALVE CONTROL (LEV CONTROL)

(1) Outline of LEV control

The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.

standard

specification

general operation

Control range

from minimum 33 (MUZ-A09/12/15/17,MUY-A15/17)/ 59

(MUZ-A24/,MUY-A24) pulse to maximum 500 pulse.

 

 

 

Actuating speed

LEV opens 40 pulse/second and close 90 pulse/second

 

 

Opening degree adjustment

LEV opening degree is always adjusted in opening direction.

 

(When reducing the opening degree, LEV is once over-

 

closed, and then adjusted to the proper degree by opening.

Unit OFF

LEV remains at maximum opening degree (reaches maxi-

 

mum opening degree approximate in 15 minutes after com-

 

pressor stops)

 

 

Remote controller ON

LEV is positioned. (first full-closed at zero pulse and then

 

positioned.)

 

 

COOL · DRY MODE

LEV is fixed to standard opening degree according to opera-

During 1 to 5 minutes after compressor starts

tional frequency of compressor.

HEAT MODE (MUZ)

 

During 1 to 15 minutes after compressor starts

 

 

 

More than COOL, DRY: 5/ HEAT: 15 (MUZ) minutes

LEV opening degree is corrected to get target discharge

have passed since compressor start-up

temperature of compressor.

 

(For discharge temperature lower than target temperature,

 

LEV is corrected in closing direction.)

 

(For discharge temperature higher than target temperature,

 

LEV is corrected in opening direction.)

 

wIt may take more than 30 minutes to reach target tempera-

 

ture, depending on operating conditions.

 

 

Thermostat OFF

LEV is adjusted to exclusive opening degree for thermostat

 

OFF.

 

 

Thermostat ON

LEV is controlled in the same way as that after the compres-

 

sor has started up.

Defrosting in HEAT mode (MUZ)

LEV is adjusted to open 500 pulse.

17

Page 17
Image 17
Mitsubishi Electronics MU-AWA, MS-AWA, MUZ-ANA, MUY-ANA Expansion Valve Control LEV Control, Cool · DRY Mode, Heat Mode MUZ

MUY-ANA, MSY-ANA, MS-AWA, MUZ-ANA, MXZ-ANA specifications

Mitsubishi Electronics has long been a leader in the HVAC (heating, ventilation, and air conditioning) industry, consistently delivering cutting-edge technology and innovative solutions. The MUZ-ANA, MUZ-ANA - U, MU-AWA, MUZ-FDNA, and MS-AWA models exemplify the company's commitment to efficiency, comfort, and advanced engineering.

The MUZ-ANA series is designed for residential and light commercial applications, offering powerful cooling and heating performance. One of the key features is its inverter technology, which allows for variable-speed operation. This means that the system can adjust the compressor speed according to the temperature demands, leading to significant energy savings and consistent comfort levels throughout the space. Additionally, the MUZ-ANA series operates quietly, ensuring a pleasant indoor environment.

The MUZ-ANA - U model takes energy efficiency a step further by incorporating a top-tier seasonal energy efficiency ratio (SEER) and heating seasonal performance factor (HSPF). This model is designed to maximize comfort while minimizing energy consumption, making it ideal for eco-conscious consumers.

The MU-AWA series is specifically tailored for larger spaces, making it suitable for commercial settings. Its robust design ensures reliability even under the most demanding conditions. Key features include advanced filtration systems that improve indoor air quality by trapping particulates and allergens, preferred by businesses aiming for a healthier environment.

The MUZ-FDNA model stands out for its sleek, compact design that fits seamlessly into various installation contexts, making it flexible for diverse architectural styles. It also features a built-in drain pan that helps in moisture removal, preventing mold growth and enhancing system longevity.

The MS-AWA model is particularly noteworthy for its smart connectivity options, allowing users to control their HVAC system via mobile devices. This feature empowers users to monitor and adjust temperatures remotely, providing added convenience and efficiency.

In summary, the Mitsubishi Electronics MUZ-ANA, MUZ-ANA - U, MU-AWA, MUZ-FDNA, and MS-AWA models feature state-of-the-art technology geared towards maximizing efficiency, comfort, and reliability. From inverter technology to smart connectivity, these units are designed to meet modern consumer demands while emphasizing sustainability and performance. With Mitsubishi Electronics, you can be assured of exceptional quality and technological advancement in HVAC solutions.