Mitsubishi Electronics MXZ-24UV User Manual download pdf (Page 19)

Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.

• The standard opening is on the straight line, which connects an each standard point in the section where divided

into seven according to the operation frequency of compressor as shown in the figure below.

(LEV opening is controlled in proportion to the operation frequency.)

Note: Opening is adjusted at the standard opening according to the indoor unit conditions.

However, inclination of standard opening in each point of opening does not change with the original curve.

• Add opening provided in Difference in Capacity in the table below to the standard opening from 1 to 8,

when capacity of the indoor unit is excluding code 1.

• Add opening provided in Difference in Operation number in the table below to determined LEV opening for

each indoor unit, when 2 or 3 indoor units are operated at the same time.

Note: Even when the adjusted standard opening exceeds the driving range from 59 to 500 pulse, actual

driving output opening is in a range from 59 to 500 pulse.

< Calculation example of LEV opening >

Cool operation: Compressor frequency 70Hz: 2 unit ON: 18class

(170-150)p(80-60)o(70-60)+150+75-30=205 pulse

Determination of LEV standard opening in each indoor unit

11-1.LEV control

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Mitsubishi Electronics MXZ-24UV User Manual Page 19