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Frost alarm
CFA-24V
Electronic freeze protection alarm with warming function, double relays and digital display. 24V AC.
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Description CFA-24V
CFA is an electronic freeze protection alarm with a digital display that is used to monitor frost in air heating systems that use water as the heat carrier.
CFA is connected to a temperature sensor that measures the water temperature in the heating coil. The water temperature in the heating coil is normally regulated by another regulator/DUC with the control signal (0-10 or 10-0V) connected via CFA to the
control valve. If the water temperature in the coil drops without any response from the regulator / DUC, CFA starts regulating the control valve.
When the water temperature in the coil drops below the pre-set alarm temperature, both relay outlets fall (normally activated).
CFA can be connected to a range of temperature sensors: Pt100, Pt1000, Ni1000 plus Calectros NTC and PTC sensors in the ETF series. Pt1000 is a factory set sensor.
The temperature measurement in CFA can be adjusted if necessary. Range: -3°C to +3°C in steps of 0.1°C.
CFA monitors the temperature sensor so that a short circuit or interruption on the sensor circuit triggers the alarm and sets the control signal at 100%.
Installation
CFA is mounted on a DIN rail and is suited to Norm enclosures.
For more information see the installation manual that comes with the product.
Properties
- Very easy configuration
- Backwards compatible with Calectro’s freeze protection
alarm EFST-6 - 2 alternating potential-free relays
- Illuminated digital display
- Fine-adjustment of the temperature measurement
- Selectable output signal 0-10V or 10-0V
