Electronic frost protection thermostat for temperature monitoring of air/hot water heat exchangers to prevent damage to the ventilation system. The temperature measurement is typically carried out by a fast-response sensor in the outlet of the heat exchanger. When the set limit value is exceeded, the TFRe overrides the original control signal of the heating valve to a larger valve opening in order to prevent freezing. If the temperature drops further, the fan is stopped for system protection and the control unit gets an alert. For temperature detection in the water outlet of the heat exchanger a fast-response sensor (e.g. TF14 with KL4VA) should be used (not in delivery).

Measuring valuestemperature
Output voltage2x 0..10 V, temperature, actuating variable valve drive
Output switch contactFan: floating contact NO, 250 V ~ / 6 A, Alarm: floating contact NO, 30 V ~ / 1 A
Power supply15..24 V = (±10%) or 24 V ~ (±10%) SELV
Power consumptionmax. 2 VA (24 V ~)
Measuring range temp.-10..+100 °C
Accuracy temperature±1 K (typ. at 0 °C)
Inputsfor passive sensor NTC10K (default), PT1000, Ni1000, Ni1000TK5000, adjustable, for external controller defining control value for valve, for fan (floating contact)
Functionsfrost protection function, controlling valve actuator, alarm, adjustable P-Controller (temperature)
DisplayLED green – indicator valve actuator, LED red – alarm, LED yellow – fan
EnclosureABS, white
ProtectionIP20 according to EN 60529
Connection electricalremovable plug-in terminal, max. 2,5 mm²
Ambient condition-40..+70 °C, max. 85% rH non-condensing
Mountingprepared for mounting on DIN rail TS35 (35x7,5 mm) according to EN 60715

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Thermokon Sensortechnik GmbH
Platanenweg 1
35756 Mittenaar
Tel.: +49 2778 6960-0

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