Mitsubishi Electronics MS-AWA manual Operation MSZ, Coil frost prevention is as same as Cool mode

Page 7
Difference between room temperature and set temper- ature during operation

2-2. DRY ( ) OPERATION

Set temperature is as shown on the right chart.

The system for dry operation uses the same refrigerant circuit as the cooling circuit.

The compressor and the indoor fan are controlled by the room tem- perature.

By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.

 

ºF

Set temperature and

 

 

 

 

initial room temperature in dry mode

 

95

 

 

 

 

 

 

 

86

 

 

 

 

 

 

temperature

77

 

 

 

 

 

 

68

 

 

 

 

 

 

Set

 

 

 

 

 

 

 

 

59

 

 

 

 

 

 

 

50

 

59

68

77

86

95 ºF

 

50

 

 

 

Initial room temperature

 

 

Difference between room

1. Thermostat control

temperature and set temper-

Thermostat is ON or OFF by difference between room temperature and set temperature.

ature during operation

Initial temperature difference

Thermostat

Set temperature

Room temperature minus set temperature : -1.8 degrees or more·······································ON

 

 

 

 

 

Room temperature minus set temperature : less than -1.8 degrees······································OFF

 

 

 

 

 

 

 

 

 

 

 

 

-1.8deg. -1.3deg.

2.Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. When thermostat OFF (compressor OFF) fan speed becomes Very Low.

In AUTO the fan speed is as follows.

Initial temperature difference

Fan speed

Room temperature minus set temperature : 3.1 degrees or more ·······························High

Room temperature minus set temperature : Between 1.8 and 3.1 degrees ···················Med.

Room temperature minus set temperature : less than 1.8 degrees ····························Low

3.Coil frost prevention

Coil frost prevention is as same as COOL mode. (2-1.3.)

Difference between room temperature and set temper- ature during operation ( T)

4.5deg.

1.8deg. 3.1deg.

The indoor fan maintains the actual speed of the moment. However ,when coil frost prevention works while the compressor is not operating it’s speed becomes the set speed.

4.Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (2-1.4.)

2-3. HEAT (

) OPERATION (MSZ)

1. Thermostat control

 

 

 

 

 

 

Thermostat is ON or OFF by difference between room temperature and set temperature.

 

 

 

 

 

Initial temperature difference

Thermostat Set temperature

Room temperature minus set temperature : less than 3.6 degrees····································ON

 

 

 

 

 

Room temperature minus set temperature : 3.6 degrees or more······································OFF

 

 

 

 

 

 

 

 

 

 

3deg.

3.6deg.

 

 

2.Indoor fan speed control

(1)Indoor fan operates at the set speed by FAN SPEED CONTROL button. In Auto the fan speed is as follows.

Initial temperature difference

Fan speed

Set temperature minus room temperature: 3.6 degrees or more······································ High

Set temperature minus room temperature: Between 0.4 and 3.6 degrees ···················· Med.

Set temperature minus room temperature: less than 0.4 degrees···································· Low

Difference between room temperature and set temper- ature during operation

3.6deg. 7.2deg. 0.4deg. 3deg.

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Contents Service Technical Guide Indoor unit models Discharge Temperature Protection Control ·····BACKOperational Frequency Control of Outdoor UNIT······16 Indoor unit models Outdoor unit modelsIndoor fan speed control Operation chart ExampleONOperation Thermostat controlIndoor fan When the room temperature is under 73FOperation time chart Example OFF OnonHorizontal vane Auto Vane OperationLow outside temperature operation Coil frost prevention Temperature controlDifference between room Low outside temperature operation is as same as Cool mode Coil frost prevention is as same as Cool modeOperation MSZ Defrosting Cold air prevention controlMSZ-A09/12/15/17 Overload startingMode selection Auto Change Over ···AUTO Mode Operation MSZCool Outdoor FAN Motor ControlHeat MUZ Horizontal blow time Function of main parts Inverter System ControlAt normal operation Purpose of PAM adoption Outline of simple partial switching methodIntelligent power module MUZ-A24 MUY-A24 Inverter main power supply circuitPower factor improvement PFC Power Factor ControllerPower transistor module Control Method of Rotation Times Sine wave controlCool Heatmuz DRY Operational Frequency Control of Outdoor UnitLEV is fixed to standard opening degree according to opera Cool · DRY ModeHeat Mode MUZ Expansion Valve Control LEV ControlLEV Time chartMUZ-A09/12/15/17/24 MUY-A15/17/24 Degree130/100 190/130 240/170 260/210 260/230 MXZ Microprocessor Control Power factor improvement Cool 5 pulse full closed Temperature is included in standard opening. w1With discharge temperature was added to basic opening. w1 Opening before stop 500 pulse in 15 minutesMXZ-3A HeatMXZ-2A Cool HeatMXZ-3A MXZ-2ACool DRY Heat Superheat LEV opening Discharge temperature ˚F Correction pulseMore than Target discharge temperature+18 More than Target discharge temperature+21.6Operational Frequency Range 40Hz Discharge Temperature Protection ControlHeat Defrosting Control Outdoor FAN Control
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