Automatic Controls - Hitachi SET FREE Serie Manual De Instalación Y Funcionamiento

Automatic controls

3 AUTOMATIC CONTROLS
3.1 AUTOMATIC CONTROLS
The system is equipped with the following functions:
Three-minute protection
The compressor remains at a standstill for a minimum of three
minutes once stopped. If the system restarts approximately 3
minutes after stoppage, the RUN indicator is enabled. However,
cooling or heating operating mode remains switched off and does
not start until after three minutes.
Frost formation prevention during cooling mode
When the system is used in a room at a low temperature, cooling
mode can be switched to fan mode for a moment to prevent frost
from forming on the indoor heat exchanger.
Low-speed air control during heating mode operations
When the compressor is stopped while the thermostat is switched
off or when the system is automatically defrosting, the fan is set
to low speed or stops.
Automatic defrost cycle
When heating mode is stopped by pressing the RUN/STOP but-
ton, a check is made for frost on the outdoor unit and, where
necessary, defrost is run for a maximum of 10 minutes.
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Automatic restart after a power shortage
If the electricity supply is interrupted for short periods (of up to 2
seconds), the remote control will store the settings and the unit
will restart when the electricity supply is re-established.
Contact your distributor where an automatic restart is required
after an electricity shortage of more than 2 seconds (optional
function).
Systems equipped with a heat pump will also be fitted with the
following functions:
Operating overload prevention
When the outdoor temperature is too high during heating mode,
this operating mode is stopped due to the outdoor thermistor be-
ing enabled until the temperature drops.
Hot start during heating mode
To prevent cold air discharge, the fan speed is controlled from
the low-speed position to that defined in line with the discharge
air temperature. The louver is set horizontally at the same time.
Compressor hot start
The FSXN1E and FSXNH(E) series requires electricity connec-
tion four hours prior to start-up (stoppage code d1-22). Where
start-up is required within four hours: See on
Run.
Carry out the Test
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