1

MS MICROPROCESSOR CONTROL

MS-A09WA MU-A09WA

MS-A12WA MU-A12WA

1-1. COOL (

) OPERATION

 

Difference between room

 

 

 

1. Thermostat control

 

temperature and set temper-

 

ature during operation.

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

 

Set temperature

 

Initial temperature difference

Thermostat

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 continuously at the set speed by FAN SPEED CONTROL button

Difference between room

regardless of the thermostat’s OFF-ON.

 

temperature and set temper-

In AUTO the fan speed is as follows.

Fan speed

ature during operation ( T)

 

Initial temperature difference

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

5.4 deg.

1.8 deg. 3.1 deg.

3.Coil frost prevention

①Temperature control

When the indoor coil thermistor RT12 reads 37 ºF or below the coil frost prevention mode starts immediately. However, the coil frost prevention doesn’t work for 5 minutes since the compressor has started.

The indoor fan operates at the set speed and the compressor stops for 5 minutes.

After that, if RT12 still reads below 37 ºF this mode prolonged until the RT12 reads over 37 ºF.

②Time control

When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.

a.Compressor has been continuously operating.

b.Indoor fan speed is Low or Med.

c.Room temperature is below 79 ºF.

When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the beginning.

Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 79 ºF. However, when two of the above conditions (b.and c.) are satisfied again. Time accumulation is resumed.

Operation chart

ExampleON

Compressor OFF

Outdoor fan

ON

OFF

Indoor fan

ON (continuously at set speed)

1-2. 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

 

3

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Mitsubishi Electronics MU-AWA, MS-AWA manual Operation, Thermostat control, Indoor fan speed control, Coil frost prevention
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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.

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