Mitsubishi Heavy Industries FDC121KXZEN1 Service Manual Download

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‘19 • KX-SM-318

(25) High power operation (RC-EX3A only)

It operates at with the setting temperature fixed at 16°C for cooling, 30°C for heating and maximum indoor fan speed for 15
minutes maximum.

(26) Energy-saving operation (RC-EX3A only)

It operates with the setting temperature fixed at 28°C for cooling, 22°C for heating or 25°C for auto. When fan control in cooling/
heating thermo-OFF setting is “Set fan speed”, fan speed during thermo-OFF is changed to “Low”. (Maximum capacity is restricted

at 80%.)

(27) Warm-up control (RC-EX3A only)

Operation will be started 5 to 60 minutes before use according to the forecast made by the microcomputer which calculates
when the operation should be started in order to warm up the indoor temperature near the setting temperature at the setting time
of operation start.

(28) Home leave mode (RC-EX3A only)

When the unit is not used for a long period of time, the room temperature is maintained at a moderate leval, avoiding extremely
hot or cool temperature.

(a) Cooling or heating is operated according to the outdoor temperature (factory setting 35°C for cooling, 0°C for heating)

and the setting temperature. (factory setting 33°C for cooling, 10°C for heating)

(b) Setting temperature and indoor fan speed can be set by RC-EX3A.

(29) Auto temperature setting (RC-EX3A only)

Setting temperature is adjusted automatically at the adequate temperature the center setting temperature is 24°C by correcting
the outdoor air temperature.

(30) Fan circulator operation (RC-EX3A only)

When the fan is used for circulation, the unit is operated as follows depending on the setting with the remote control.

(a) If the invalid is selected with the remote control, the fan is operated continuously during the fan operation. (mormal

fan mode)

(b) If the valid is selected with the remote control, the fan is operated or stopped when on the difference of the remote

control temperature sensor and the return air temperature sensor becomes bigger than 3°C.

(31) The operation judgment is executed every 5 minutes (RC-EX3A only)

Setting temperature Ts is changed according to outdoor temperature.
This control is valid with cooling and heating mode. (Not auto mode)

(a) Operate 5 minutes forcedly.

(b) Setting temperature is adjusted every 10 minutes.

(i) Cooling mode

Ts = outdoor temperature

－

offset value

(ii) Heating mode

Ts = outdoor temperature

－

offset value

(c) If the return air temperature lower than 18°C in cooling or return air temperature becomes higher than 25°C in heating,

unit goes thermostat OFF.

(32) Auto fan speed control (RC-EX3A only)

In order to reach the room temperature to the set temperature as quickly as possible, the air flow rate is increased when the set
temperature of thermostat differs largely from the return air temperature. According to temperature difference between set
temperature and return air temperature, indoor fan tap are controlled automalically.

・

Auto 1: Changes the indoor fan tap within the range of Hi

↔

Lo.

・

Auto 2: Changes the indoor fan tap within the range of P-Hi

↔

Lo.

(33) Indoor unit overload alarm (RC-EX3A only)

If the following condition is

at 30 minutes after starting operation, RC-EX3A shows maintenance code "M07" and the

signal is transmitted to the external output (CnT-2-5).