Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 103

(31) Fan circulator operation (RC-EX1A 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 indoor unit return air temperature sensor becomes bigger than 3°C.
(32) The operation judgment is executed every 5 minutes (RC-EX1A 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 or return air temperature becomes lower than 25°C, unit goes thermo OFF.
(33) Auto fan speed control (RC-EX1A only)
In order to reach the room temperature to the set temperature as quickly as possible, the airflow rate is increased when the set
temperature of thermostat differs largely from the return air temperature. According to temperature difference be tureen set
temperature and return air temperature, indoor fan tap are controlled automalically.
・ Auto 1: Changes the indoor unit fan tap within the range of Hi ↔ Me ↔ Lo.
・ Auto 2: Changes the indoor unit fan tap within the range of PHi ↔ Hi ↔ Me ↔ Lo.
(34) IU overload alarm (RC-EX1A only)
When the indoor air temperature becomes higher or lower than the temperature set with the remote control by more than 5 to
10 ℃ at 30 minutes after starting operation, the signal is transmitted to the external output (CNT). Receipt of the signal by the
external output is indicated by lighting an LED or other prepared onsite.
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