Mitsubishi Electronics MUZ-FDNA - U Expansion Valve Control LEV Control, Pulse MUZ-A24 MUY-A24

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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 °F set for each operational frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air con- ditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temperature (Shell temperature) of the compressor, developing the unit’s performance.

Standard specification

General operation

 

Minimum

: 33 pulse (MUZ-A09/12/15/17 MUY-A15/17)

 

 

59 pulse (MUZ-A24 MUY-A24)

Control range

 

54 pulse (MUZ-FD)

 

 

58 pulse (MUZ-DMUY-D)

 

Maximum

: 500 pulse

Actuating speed

Open : 40 pulse/second

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 maximum

 

opening degree approximate in 15 minutes after compressor

 

stops)

 

 

 

Remote controller ON

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

 

tioned.)

 

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

 

 

During 1 to 15 minutes after compressor starts

 

 

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

LEV opening degree is corrected to get target discharge tem-

have passed since compressor start-up

perature of compressor.

 

(For lower discharge temperature than target temperature,

 

LEV is corrected in closing direction.)

 

(For higher discharge temperature than target temperature,

 

LEV is corrected in opening direction.)

 

It 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

LEV is adjusted to open 500 pulse.

 

 

 

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Contents Contents Revised EDITION-BRevision a MS-A09WA MU-A09WA MS-A12WA MU-A12WA MXZ-2A20NA MXZ-3A30NA MXZ-4A36NAMS-AWA MU-AWA Cool OperationWhen the room temperature is under 73 F Operation time chart ExampleAuto Vane Operation Horizontal vaneMUZ-ANA MUY-ANA MUZ-FDNA MUY-DNA MUZ-DNA Low outside temperature operationMSZ-ANA MSY-ANA MSZ-FDNA MSY-DNA MSZ-DNA MSZ-A MSY-A MSZ-FD MSZ-D MSY-DHeat Operation MSZ Overload starting MSZ-A24Gradation of fan speed in initial DefrostingAuto Change Over ··· Auto Mode Operation MSZ Mode selectionOutdoor FAN Motor Control MUZ-A MUY-AMUZ-FD MUZ-D MUY-D Inverter System Control MUZ-FDFunction of main parts MUZ-A24 MUY-A24 MUZ-D MUY-D Purpose of PAM adoption Outline of simple partial switching methodAt normal operation Input current waveform without PAMIntelligent power module Elimination of electrical noiseCompressor Sine wave control Control Method of Rotation TimesOperational Frequency Control of Outdoor Unit MUZ-FD09MUZ-FD12 Expansion Valve Control LEV Control Cool · DRY ModeHeat Mode Pulse MUZ-A09/12/15/17 MUY-A15/17MUY-A15/17 MUZ-A09/12MUZ-A15/17 MUZ-A24260 Inverter main power supply circuit MXZ-ANAProtects transistors from over current Opening before stop → 500 pulse in 15 minutes Cool Heat MXZ-2A20NA/3A30NAMXZ-2A20NA MXZ-3A30NAMXZ-2A20NA MXZ-3A30NAMXZ-3A30NA Exclusive LEV MXZ-2A20NA Exclusive LEVReceiver LEV MXZ-4A36NACool DRY Heat MXZ-2A MXZ-2A20NAMXZ-3A30NA MXZ-3A MXZ-4AOperational Frequency Range ∆RTOutdoor FAN Control Discharge Temperature Protection ControlHeat Defrosting Control MXZ-4APRE-HEAT Control MXZ-2A20NA- 1 MXZ-3A30NA MXZ-4A36NA High pressure protection DRY OperationHeat Operation Made in Japan
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MSZ-FDNA, MUZ-FDNA - U, MUZ-FDNA, MUZ-ANA - U, MUY-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.

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