Mitsubishi Electronics MUY-ANA manual Auto Change Over ···AUTO Mode Operation MSZ, Mode selection

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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