DESCRIPTION

The patented APS–4 provides effective, economical automatic control of snow melting systems including those for gutter and down spouts. The ability to use multiple sensors ensures optimum control of large systems.

Supply voltage options include 240 volt single phase or 208, 277, 480 and 600 volts 3-phase, with a contactor rating of 50 amps per pole. The integral 30 mA ground fault circuit interrupter with a test/reset facility ensures safety along with NEC and local code compliance. The APS–4 operates up to ten SC–40 Satellite Contactors for larger loads.

The adjustable 10 hour hold-on timer keeps heaters operating after snow stops to ensure complete melting. A cycle switch can be used to operate heaters for the hold-on timer setting. This useful feature melts tracked or blowing snow or ice. LED indicators permit monitoring snow melting system operation.

The optional patented RCU–1 Remote Control provides monitoring and control of the snow melting system at a convenient location.

For installation simplicity and low cost, sensors, the RCU–1, and satellite contactor control wiring is NEC Class 2. The APS–4's nonmetallic enclosure is rated for protected NEMA 3R locations in the temperature range of −40° to 160°F (−40° to 60°C).