Time chart of defrosting in HEAT mode (reverse type)

<indoor unit>

 

set position

horizontal

set position

Horizontal vane

 

 

 

 

Indoor fan

 

 

 

set speed

Very Low (temperature of indoor coil thermistor > 64°F)

set speed

 

 

 

OFF

 

 

 

 

30

 

 

 

 

 

seconds

 

 

 

 

<outdoor unit>

 

 

 

 

 

 

 

Maximum frequency

 

 

 

Compressor normal

 

 

 

 

 

 

OFF

 

 

OFF

 

40

30

 

40

30

 

seconds seconds

5 seconds

seconds

seconds

5 seconds

 

 

 

 

ON

 

 

 

 

ON

Outdoor fan

 

 

 

 

 

 

 

OFF

 

 

 

ON (HEAT)

 

 

 

ON (HEAT)

R.V. coil

 

OFF (COOL)

 

 

 

(21S4)

 

 

 

 

 

 

 

 

 

2-4. AUTO CHANGE OVER ···AUTO MODE OPERATION (MSZ)

Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.

1.Mode selection

(1)Initial mode

At first indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature. Following the conditions below, operation mode is selected.

1 If the room temperature thermistor RT11 reads more than set temperature, COOL mode is selected. 2 If the room temperature thermistor RT11 reads set temperature or less, HEAT mode is selected.

(2)Mode change

In case of the following conditions the operation mode is changed.

1COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 4 degrees below the set temperature.

2HEAT mode changes to COOL mode when 15 minutes have passed with the room temperature 4 degrees above the set temperature.

In the other cases than the above conditions, the present operation mode is continued.

NOTE1: Mode selection is performed when multi standby (refer to NOTE2) is released and the unit starts operation with ON-timer.

NOTE2: If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is

operating in AUTO ( ), cannot change over the other operating mode (COOL HEAT) and becomes a state of standby.

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Mitsubishi Electronics MUY-ANA, MS-AWA, MUZ-ANA, MU-AWA, MSY-ANA Auto Change Over ···AUTO Mode Operation MSZ, Mode selection

MUY-ANA, MSY-ANA, MS-AWA, MUZ-ANA, MXZ-ANA specifications

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