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MEP POSTŘELMOV

RT3/3, RT3/3A heating unit

RT3/3 is used to heat passenger areas in trams. RT3/3A is used to heat passenger areas in trolley buses.

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RT3/3 is used to heat passenger areas in trams. RT3/3A is used to heat passenger areas in trolley buses. Both heaters are mounted under passengers’ seats.

The heater cover is made from steel sheet protected against corrosion by means of powder painting. The color of the painting is applied in accordance with the requirements of the user. The heater design enables horizontal under seat mounting. Individual components are mounted inside the cover of the heater (fan, radiator, regulator with IGBT switching, temperature sensor and safety-fuse). The radiator consists of three U shaped heating rods connected in series equipped with cooling radiator fins. The design of the heater ensures an almost constant air distribution inside the grill and temperature of covers up to 60°C. The maximum temperature of output air is limited by an electric regulator, which limits the heating power by the ratio of switching and opening times of IGBT semi-conductor switch. In the case of fan failure or failure of the electronic unit, the maximum cover temperature will be limited by a bimetallic safety fuse. The heater is connected to the external circuits with the help of self-tightening clamps, which are accessible after removing the side cover equipped with safety screws. The cover is provided with two PG21 bushings to connect power and controlling cables.

Specifications

Rated heat output3 000 W
Temperature of output airabout 60 °C
Rated output voltageDC 600 V
Voltage range of outputDC 400 V – DC 870 V
Rated voltage of control circuitsDC 24 V
Voltage range of control circuitsDC 16,8 V – DC 30 V
Input of control circuits20 W
Dimensions485 × 300 × 150 mm
Weight17 kg
Degree of protectionIP20

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