IM 1287-6 • REBEL APPLIED ROOFTOP 116 www.DaikinApplied.com
Electric Heater Step Controller
The S5 Series step controller is a microcomputer-based stage
controller designed to provide low cost precise control for
multi-stage applications. Common applications are HVAC duct
heaters, industrial process air heaters and circulation heaters.
• Low voltage 24 VAC microcomputer-based stage
controller
• Capable of controlling 24 VAC loads
• 5 stage controller with a pulsed 10 VDC vernier stage
rated at 100 mA.
• Up to 10 stages of control when using a slave unit
Stage Sequencing
The S5 Series step controller operates in a linear control mode.
The rst stage ON will be the last stage OFF (LIFO).
For example: 1,2,3,4,5 ON then 5,4,3,2,1 OFF.
Vernier Operation
The S5 Series step controller supports a 10 VDC pulsed
vernier stage to operate a slave SCR/SSR controller. This will
result in more precise control than is otherwise possible with
a standard on-o step controller. The slave SCR/SSR power
controller provides proportional control (0-100% load) between
the switching of the step controller stages:
Figure 179: Sequence Control without Vernier
Figure 180: Sequence Control without Vernier
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