275 Frost-Protection Accessories Transformer for trough heating • transforms the voltage from 230 volts to 24 volts • can be used for all frost-free waterers • Short circuit and overload protection through easily replaceable automotive fuse in the output circuit • the transformers are also secured against overheating thanks to an integrated temperature limiter (automatic reset after cool-down) • IP 65 (transformer) / IP 20 (connection) • Produced using vacuum casting: the best possible protection against moisture, mechanical and electronic loads Conventional car microfuses for safe operation of the installation Ref. no. Thickness € 222796 100 VA 1 222797 200 VA 1 222626 300 VA 1 222798 400 VA 1 Which transformer should be used? If you want to operate a water bowl with 80 watts of power (supplied), then a 100-watt transformer will suffice (item no. 222796). If you also want to connect a 24 V heating cable, simply add the current consumption (= wattage) of the cable. When selecting the transformer, plan for a power reserve of 15 % (factor 1.15). Which cable should I use? If the 24 V supply has to cover a larger distance between the transformer and the heater, please pay attention to the cable cross-section, to prevent the risk of drops in voltages along the cable’s route. Calculation to ascertain the minimum cable cross-section: Power x cable length: 3200 W/m In the above example, the result for a distance of 25 metres from the transformer to the heater is as follows: (282 W x 25 m: 3200 W/m) mm² = 2.2 mm² In this case, a cable with a cross-section of 2.5 mm² must be used. Calculation example for transformer: 2 x Drinking Bowls with 100 W Power Consumption = 200 watts 1 x frost-protection heating line 24 V each with 30 W = 30 watts 1 x frost-protection heating line 24 V each with 15 W = 15 watts total consumer power = 245 watts Buffer (flat rate of 15 %) 245 W x 1.15 = 282 watts The transformer of choice has an output of 300 W.
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