Fcu_Fancontrol - iSMA CONTROLLI iSMA-B-FCU User Manual

iSMA-B-FCU Programming User Manual
Temperature Analog Modes Dependencies
If the Temperature Control slot is set to true (analog control), and the value of the
Fan Mode Out slot is higher than 0 (the fan is switched on), the Temperature Analog
Enable slot is set to true.
If the Temperature Control slot is set to true (analog control), and the Antifrost slot is
set to true (the component works in the antifrost mode), the Temperature Analog
Enable slot is set to true. In other cases, the Temperature Analog Enable slot is set to
false.
• FCU Mode: sets the mode of the FCU (receives numeric values);
Available settings: (0) Off, (1) Auto, (2) Heating Only, (3) Cooling Only, (4) Fan Only;
Note: If the FCU Mode slot is set to 4 (fan only), and the Antifrost slot is set to false (no
antifrost mode), the Temperature Binary Enable and Temperature Analog Enable slots are
overridden to false.
• Fan Mode: sets the fan mode (receives numeric values);
Available settings: (0) Off, (1) Manual Speed 1, (2) Manual Speed 2, (3) Manual
Speed 3, (4) Auto;
• Occupancy Status: sets the occupancy status (receives numeric values);
Available settings: (0) Unoccupied, (1) Occupied, (2) Standby;
• Temperature Control: sets the mode of the temperature control;
Available settings: true (analog control), false (binary control);
• Antifrost: enables or disables the antifrost mode;
Available settings: true (Antifrost enabled), false (Antifrost disabled).

10.19 FCU_FanControl

The FCU_FanControl is a component to control the fan. The component has been created
for 1-, 2-, or 3-speed fans, and for fans with analog inputs (the type of the fan can be
selected by the user). The fan algorithm can be split into two modes:
• Standard: the demand for the fan is active, and the fan speed is calculated based on
the temperature value. The standard mode conditions:
the FanDemand slot is false;
the Antifrost slot is false;
the HeatingOccupiedActive slot is false;
the CoolingOccupiedActive islot s false;
the TestMode slot is 0.
• Non-standard: the additional parameters override the fan speed. The non-standard
mode must comprise
HeatingOccupiedActive, CoolingOccupiedActive, is true, or the Test Mode is higher
than 0.
In the standard mode, the fan is switched on when the internal variable, the Fan Control
Value (calculated on the basis of the CV and Setpoint slots), is higher than the Fan Speed
1 Threshold, and switched off when the Fan Control Value is lower than the Fan Off
Threshold.
The non-standard operation is defined by the slots states combinations and is described
below.
at least one
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of the slots:
DMP243en | 1st Issue rev. 5 | 07/2024
FanDemand, Antifrost,
page 123 of 133