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8.3.2 - OPERATING MODES
• The 5 available operating modes:
- Standby
(indicated by yellow LED 9)
- Automatic
(indicated by red LED 10)
- Ventilation only
(indicated by red LED 11)
- Cooling only
(indicated by red LED 12)
- Heating only
(indicated by red LED 13)
• When powered up, the device is set at "Standby". In this mode, all the controller’s outputs are deactivated and the air-
conditioner is not is service. Only light 9 is lit.
• All mode selections on key 3 (by pressing it successively) are immediately indicated by a LED.
However, the device does not take into account the modification of the mode until after about 3 seconds.
Consequently, when rapidly going through the different modes, the device does not take into account the intermediate modes
and stays at its initial status.
A - AUTOMATIC MODE
• In this mode, the Cooling and Heating functions are selected automatically according to the difference between the set-point
and the ambient temperature (see preceding diagram).
• The set-point corresponds to the point where the compressor stops when in heating mode.
• The activated operating mode is indicated by light 7 for Heating and 8 for Cooling. These lights flash if a safety time delay
is in progress. They change to steady light when the unit is operating.
B - VENTILATION MODE ONLY
• In this mode, only the PA ventilator is in operation.
• The Heating/Cooling control is deactivated.
C - COOLING MODE ONLY
• In this mode, only the Cooling is in operation.
• The device does not heat.
• The cycle inversion valve is not activated.
D - HEATING MODE ONLY
• In this mode, only the Heating is in operation.
• The device does not cool.
• The cycle inversion valve is activated permanently.
8.3.3 - PA VENTILATION OPERATING MODES
• Two operating modes are available:
- Automatic
(indicated by red LED 14)
- Manual
(indicated by red LEDs 15)
A - AUTOMATIC VENTILATION MODE
• This mode is selected by the control as soon as it switches from "Standby" mode to "Automatic" mode, by pressing key 3.
• In this ventilation mode:
- ventilation speed is selected automatically according to the difference between the set-point and the ambiant temperature,
- ventilation stops when in the neutral zone between cold and hot,
- in HEATING and COOLING only modes, the ventilator is cut off at the point where these two functions are stopped,
- in VENTILATION ONLY, the operation is the same as for Cooling only, i.e. the ventilator is cut-off if the temperature falls
below the SET-POINT + NEUTRAL ZONE value.
B - MANUAL VENTILATION MODE
• This mode is selected by pressing key 4.
• In this mode, the ventilation operates continuously at the speed selected (3 speeds).
• It is possible to switch back to automatic ventilation mode by pressing on key 4 again.
NOTE:
Stopping the ventilation of the PA is delayed by 1 minute after stopping in Heating mode to ensure the evacuation
of residual heat.
8.3.4 - SET-POINT ADJUSTMENT
• The set-point is adjusted by using the + and - keys (references 1 and 2). The adjustment range is from 16 to 30
°
C.
• At each press, the LED display shifts by one position to the right (increase temperature) when pressing the + key or to the
left (decrease temperature) when pressing the - key.
• In STANDBY mode all the LED’s of the scale are off. By selecting any mode by using the push-button on the left, the display
will light and correspond to the last value selected.
• When first powering up and after selecting the operating mode, the value displayed is automatically 22
°
C.
• This is also the case after power has been cut-off for a period of 4 hours.
• As the control is equipped with a back-up accumulator, the display will indicate the last value selected after power
has been restored if the cut-off period is less then 4 hours.
