Mitsubishi Electronics Comprehensive Guide for Mitsubishi Multi-System Air Conditioners - MSZ FD25VA and MSZ FD35VA

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NOTE 2

FOR MULTI SYSTEM AIR CONDITIONER

OUTDOOR UNIT : MXZ series

Multi system air conditioner can connect two or more indoor units with one outdoor unit.

•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode.

L AREA R

POWER CLEAN PLASMA

Lighted

 

 

Blinking

 

 

Not lighted

•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes(max. 10 minutes) to blow out the warm air.

•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flow- ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

9-5. AUTO VANE OPERATION

1.Horizontal vane

(1)Vane motor drive

These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.

(2)The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.

(3)Positioning

To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected angle.

Confirming of standard position is performed in the following cases:

(a)The operation starts or finishes (including timer operation).

(b)The test run operation starts.

(c)Standby mode (only during multi system operation) starts or finishes.

(4)VANE AUTO ( ) mode

The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.

COOL and DRY operation

HEAT operation

Vane angle is fixed to Angle 1.

Vane angle is fixed to Angle 4.

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(5)STOP (operation OFF) and ON TIMER standby

In the following cases, the horizontal vane returns to the closed position.

(a)When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).

(b)When the operation is stopped by the emergency operation.

(c)When ON TIMER is ON standby.

(6)Dew prevention

During COOL or DRY operation with the vane angle at Angle 3 ~ 5 when the compressor cumulative operation time exceeds 1 hour or 30 minutes, the vane angle automatically changes to Angle 2 for dew prevention.

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Contents MSZ-FD25VA E1 MSZ-FD25VAS E1 MSZ-FD35VA E1 MSZ-FD35VAS E1 Page Technical Changes See control operation Part Names and FunctionsSpecifications and rating conditions of main electric parts SpecificationIndoor model MSZ-FD25VA MSZ-FD25VAS Noise Criteria CurvesWiring Diagram Outlines and DimensionsUnit mm Unit mm Refrigerant System DiagramTimer Short Mode Service FunctionsP.C. Board Modification for Individual Operation J1 J2Auto Restart Function Remote ControllerOperation OPERATE/STOP Microprocessor ControlCool Operation Auto Change Over ··· Auto Mode OperationDRY Operation Heat OperationOutdoor Unit MXZ series Auto Vane OperationHorizontal vane COOL/DRY Heat Vertical vaneSee Control Operation Area SettingSee Sensor Daytime Operation and operating range Plasma OperationTimer Operation Clean OperationProgram Timer Emergency Operation switch E.O.SW Minute Time Delay OperationEMERGENCY/TEST Operation Troubleshooting OFF Failure Mode Recall FunctionPlasma operation check Flow chart of Plasma operation failure mode recall functionPlasma operation failure mode table Indoor unit failure mode tableStart Instruction of TroubleshootingAn abnormality other than above mentioned is detected Troubleshooting Check TablePlasma Trouble Criterion of Main Parts Power lamp flashes 3-time Indoor fan does not operate Troubleshooting FlowYes Check of indoor P.C. board and indoor fan motor How to check miswiring and serial signal error Check of installation of the horizontal vane Electromagnetic noise enters into TV sets or radios Indoor electronic control P.C. board Test Point Diagram and VoltageSW P.C. Board CN1 Removing the panel Photo Disassembly InstructionsPower monitor receiver Removing the electrical box Photo Removing the nozzle assembly PhotoRemoving the vertical vane motor unit Photo Removing the indoor fan motor and the line flow fan Photo Removing the horizontal vane motor PhotoSpecifications subject to change without notice