TFRe
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 values | temperature |
|---|---|
| Output voltage | 2x 0..10 V, temperature, actuating variable valve drive |
| Output switch contact | Fan: floating contact NO, 250 V ~ / 6 A, Alarm: floating contact NO, 30 V ~ / 1 A |
| Power supply | 15..24 V = (±10%) or 24 V ~ (±10%) SELV |
| Power consumption | max. 2 VA (24 V ~) |
| Measuring range temp. | -10..+100 °C |
| Accuracy temperature | ±1 K (typ. at 0 °C) |
| Inputs | for passive sensor NTC10K (default), PT1000, Ni1000, Ni1000TK5000, adjustable, for external controller defining control value for valve, for fan (floating contact) |
| Functions | frost protection function, controlling valve actuator, alarm, adjustable P-Controller (temperature) |
| Display | LED green – indicator valve actuator, LED red – alarm, LED yellow – fan |
| Enclosure | ABS, white |
| Protection | IP20 according to EN 60529 |
| Connection electrical | removable plug-in terminal, max. 2,5 mm² |
| Ambient condition | -40..+70 °C, max. 85% rH non-condensing |
| Mounting | prepared for mounting on DIN rail TS35 (35x7,5 mm) according to EN 60715 |