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S10 Series Step Control

Indeeco's S10 series step controller does more to provide precision control for multi-stage applications.  Common applications include HVAC duct heaters, industrial process heaters, circulation heaters and boilers.

Product Highlights

Low voltage 24 VAC microcomputer-based stage controller

Capable of controlling 24, 120 or 240 VAC loads

10 stage controller with a pulsed 12 VDC vernier stage rated at 100 mA.

Up to 20 stages of control when using two units wired in a master & slave configuration

24 VDC power supply rated at 200 mA is available for an external sensor

Supports both linear and progressive operation modes

Features & Benefits

Micro-computer based control
Accuracy and reliability

Support for a wide selection of input signals
Field adjustable switches to support 6 predefined signals and DC voltage ranges anywhere between 0-20 VDC

Adjustable inter-stage delays
Field adjustable switches to support independent stage on and off delays

External power supply
24 VDC power supplied to support external sensors

Fail Safe
Unit cycles down to full OFF if input leads are open, reversed or shorted

Diagnostic capabilities
11 LED status lights provide detailed status information for troubleshooting

Functional test mode
Built-in test mode for quick troubleshooting


UL Recognized:
File E52105 Guide XAPX2/8

Storage & Operating Temp: 
-22° to 186°F (-30°C to 80°C)
Maximum operating temperature of 167°F (75°C) when supplied in enclosure (204 & 205 product code) with class 2 transformer.

Relay Outputs:
240 VAC ±10%, 90VA max
208 VAC ±10%, 90VA max
120 VAC ±10%, 90VA max
24 VAC ±10%, 24VA max
Relay Wire Range: 10-24 AWG
Power Supply:
24 VAC ±10%, 50/60 Hz
10.5 VA max - Base 10 stage operation with vernier output.
11.3 VA max - Additional power required for 24 VDC accessory outputs.
Power Supply Wire Range: 10-24 AWG
Input Signal:
Impedance: 10KΩ for VDC inputs ; 250Ω for mA inputs
Input Signal Wire Range: 14-30 AWG
Auxiliary VDC Output:
24 VDC ±10%, 200 mA max ; Wire Range 14-30 AWG

Vernier Output:
12 VDC pulsed, 100 mA max ; Wire Range 14-30 AWG


For product specifications, refer to our technical document center.