Service Manual

ManualsBrandsMitsubishi ManualsDuctless Mini Splits20,000 BTU 20 SEER Dual Zone Heat Pump System 9+12

(4) The initial set temperature is decided by the initial room temperature.

Initial room temperature Model Initial set temperature

79°F (26°C) or more

COOL mode of

"I FEEL CONTROL"

75°F (24°C)

77 to 79°F (25 to 26°C) Initial room temperature minus 4°F (2°C)

Less than 79°F (25°C)

DRY mode of

"I FEEL CONTROL"

Initial room temperature minus 4°F (2°C)

(5) TEMPERATURE buttons

In “I FEEL CONTROL” (

) mode, set temperature is decided by the microprocessor based on the room temperature.

In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too

warm.

Each time the TOO

ARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.

• Fuzzy control

When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, consider-

ing the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user's preference to

heat or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.

In DRY mode of “I FEEL CONTROL”, the set temperature does not change.

TOO

COOL

…

To raise the set temperature 2~4°F (1~2°C)

TOO

WARM

…

To lower the set temperature 2~4°F (1~2°C)

8-6. AUTO CHANGE OVER ∙∙∙ AUTO MODE OPERATION (MSZ)

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

Mode selection

(1) Initial mode

When unit starts the operation with AUTO operation from OFF:

• If the room temperature is higher than the set temperature, operation starts in COOL mode.

• If

the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.

(2) Mode change

COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2°F (1°C) below

the set temperature.

HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2°F (1°C) above

the set temperature.

NOTE 1

If 2 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 to the other operating mode (COOL ↔ HEAT (MSZ)) and becomes a state of standby.

Refer to NOTE 2 "FOR MULTI SYSTEM AIR CONDITIONER".

NOTE 2

FOR MULTI SYSTEM AIR CONDITIONER

OUTDOOR UNIT: MXZ series

Multi system air conditioner can connect 2 or more indoor units with 1 outdoor unit.

• When you try to operate 2 or more indoor units with 1 outdoor unit simultaneously, 1 for the cooling and the oth-

ers for heating, the operation mode of the indoor unit that operates first is selected. Other indoor units cannot

operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the indoor

units to the same operation mode.

• 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.

Lighted

Blinking

Not lighted

OBH732C