Time-switches for HVAC applications

March 2010 Operator Interfaces, Switches & Relays

Legrand has a comprehensive range of time switches designed for precise control and energy efficiency in diverse environments, including heating, airconditioning and refrigeration applications. Legrand’s Rex time-switches are suitable for OEMs and panel builders who can pre-programme the unit on installation. At a later stage when the panel or product is connected to power, all the end-user has to do is set the realtime, like adjusting a digital clock.

The MicroRex analogue and digital modules are 24-hour and seven day time-switches for DIN rail and wall mounting, with a 100 hour running reserve. The units have the capability for multiple programmes for optimum time setting flexibility, controlled by either a quartz or synchronous motor and with an override facility for increased safety.

The PolarRex analogue defrost switch is designed for short periods of controlled defrosting. This unit is equipped with a daily disc and continuously adjustable short time programmes, which can be repeated up to eight times in 24 hours. These units have changeover contacts for compressors or heaters, with the ability to terminate the cycle by thermostat.

Programming is simple and directed by key presses. The clear layout of the segmented block display makes time, day and programme information quick and easy to read. Other features include automatic summer and winter settings, an EEPROM memory which prevents settings being lost and the facility to programme the clock prior to dispatch.

For more information contact Legrand, +27 (0)11 444 7971, [email protected], www.legrand.co.za

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