TP Software User Manual
www.ismacontrolli.com
DMP253en | 1st Issue rev. 0 | 04/2022
page 23 of 49
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no LEDs light up: a temperature in the room is near the EFFECTIVE_SETPOINT value;
blue LEDs light up: a temperature in the room is higher than the EFFECTIVE_SETPOINT
value, cooling;
red LEDs light up: a temperature in the room is lower than the EFFECTIVE_SETPOINT
value, heating.
Number and brightness of LEDs indicate exact difference of the values:
every 0.5 degree of difference lights up a next LED half way up;
every 1 degree of difference lights up a next LED to maximum;
a difference greater than 3 degrees lights up all 3 LEDs and does not change further;
changes are controlled with 0.2 degrees hysteresis to prevent LEDs flashing.
5.5 CO2 Alarm
Devices equipped with the CO2 sensor can monitor a CO2 concentration and alarm user
in case of too high values. An alarm state is presented in the following parameter or in the
iSMA Configurator:
ALARM_STATUS:
indicates
a current status of the CO2 alarm;
Modbus register: 30230;
BACnet object: BI0, property: Present Value.
The CO2 alarm can be configured using the following parameters:
CO2_SETPOINT_FOR_ALARM:
allows
to set a tipping point for CO2 alarm. The default
value is set to 1500 ppm;
Modbus register: 40226;
BACnet object: AO19, property: Present Value;
CO2_HYSTERESIS_FOR_ALARM:
allows
to set a hysteresis value for launching the CO2
alarm. The default value is set to 100 ppm;
Modbus register: 40227;
BACnet object: AO20, property: Present Value.
5.5.1 User Interface for CO2 Alarm
When the alarm triggers (the ALARM_STATUS register's value is 1), it can be confirmed by
pressing any touchscreen button. It stops a visualization of the alarm status, but does not
affect the ALARM_STATUS parameter.
The alarm confirmation can be configured in the following parameter:
DEVICE_CONFIGURATION, bit 8: CO2_ALARM_CONFIRM:
allows
to enable confirmation
of the CO2 alarm with any button of the panel;
Modbus register: 40205;
BACnet object: BO63, property: Present Value.
After the CO2 alarm
triggers, the
feature takes control over the display and illumination
and starts blinking. The control is returned to normal after the alarm is confirmed or after
the CO2 value decreases below the CO2_SETPOINT_FOR_ALARM level (taking the
CO2_HYSTERESIS_FOR_ALARM value into account).
