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Fan Control

This feature allows a user to control ventilation devices through the following parameters or in the iSMA Configurator:

FAN_MODE: allows to select a fan mode. There are up to 5 different fan modes, which can be selected locally from the panel.

Register Value

Fan Mode

0

Off (default)

1

Manual, speed 1

2

Manual, speed 2

3

Manual, speed 3

4

Auto

Fan modes
  • Modbus register: 41602;
  • BACnet object: MSV1, property: Present Value;

FAN_CURRENT_SPEED: allows to set the fan operating speed and mode according to the table below:

Register Value

Fan Mode

Description

0

Off (default)

Fan is off

1

Manual speed 1

Fan works in speed 1, manual mode

2

Manual speed 2

Fan works in speed 2, manual mode

3

Manual speed 3

Fan works in speed 3, manual mode

4

Auto speed 1

Fan works in speed 1, auto mode

5

Auto speed 2

Fan works in speed 2, auto mode

6

Auto speed 3

Fan works in speed 3, auto mode

The FAN_CURRENT_SPEED register values
  • Modbus register: 41601;
  • BACnet object: MSV0, property: Present Value.

This value can be updated in two ways depending on the FAN_CONFIG_LOCAL_MODE parameter:

FAN_CONFIGURATION, bit 6: FAN_CONFIG_LOCAL_MODE: allows to set the fan to work either in the local mode or BMS mode:

Local Mode: the panel's fan setting works in a local mode (the value of the FAN_CURRENT_SPEED register is determined by the value of the FAN_MODE register and so the value of the FAN_CURRENT_SPEED register cannot be overwritten by the higher level system);

BMS Mode: the panel's fan setting works in the BMS mode. The FAN_MODE register works separately from the FAN_CURRENT_STATUS register.

The default value is the BMS mode.

  • Modbus register: 41614;
  • BACnet object: BO60, property: Present Value.

User Interface for Fan Control

Fan control can also be performed using the panel's touchscreen (see Operating User Interface). It is possible to change the fan mode depending on the configurations:

FAN_CONFIGURATION, bit 1: EDITABLE: enables or disables the fan to be edited locally from the panel;

  • Modbus register: 41614;
  • BACnet object: MSV1, property: 4200;

FAN_CONFIGURATION, bit 2: FAN_PART_EDITABLE: allows to set the fan to be fully editable (all modes stored in the FAN_MODE register available) or partly editable (selection between the auto mode and off);

  • Modbus register: 41614;
  • BACnet object: BO58, property: Present Value.

FAN_TYPE: allows to select a fan type. The fan type selection determines, which fan modes are available in the FAN_MODE register.

Register Value

Fan Type

0

0-10 V

1

1-speed fan

2

2-speed fan

3

3-speed fan

4

1-speed, no auto mode

5

2-speed, no auto mode

6

3-speed, no auto mode

Fan types
  • Modbus register: 41603;
  • BACnet object: MSV2, property: Present Value.

How to Change the Fan Mode on the Touchscreen?

  • Use a small fan button to decrease the value by one.
  • Use a big fan button to increase the value by one.
  • Reached limit is signalized by a double beep.
  • A long press is not available for this feature.

LEDs

Value of the FAN_CURRENT_SPEED parameter is presented on the LEDs ladder as follows:

  • fan speeds from 1 to 3 lights up a single led for each level (same for manual and auto);

  • auto settings light up an Auto LED.

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