Maxitrol SC11-B Signal Conditioner

The Maxitrol SC11-B Signal Conditioner is a track-mounted interface designed for veteran technicians needing to integrate modern Building Automation Systems (BAS) with Selectra modulating valves. This analog signal conditioner provides a clean 0-20 VDC output signal, enabling precise burner control for both direct-fired and indirect-fired gas applications. By converting a standard controller input, the SC11-B allows you to drive multiple modulating gas valves simultaneously from a single 4-20mA or 0-10 VDC source, ensuring consistent discharge air temperatures across complex HVACR systems.

For field configuration, the SC11-B features an on-board 3-position DIP switch to toggle between input types; set all positions to "ON" for a 4-20mA input signal or "OFF" for a 0-10 VDC control signal. This unit serves as a direct drop-in for legacy SC10-A6S2 and SC10-V6S2 models. Operating on 24VAC (20VA), it maintains reliable performance across a wide ambient temperature range of -40°F to 158°F. To ensure signal integrity and prevent internal damage, always use an independent transformer and avoid grounding the secondary in any portion of the circuit external to the conditioner.

• Universal Input Compatibility: Easily field-adjustable to accept 4-20mA or 0-10VDC signals for seamless BAS integration.
• Multi-Valve Control: Engineered to drive several Selectra Modulating Valves (M or MR series) from a single output.
• Legacy Replacement: Provides a simplified upgrade path for outdated Maxitrol SC10 series signal conditioners.
• Rugged Temperature Rating: Built to withstand harsh mechanical rooms and rooftop unit environments from -40°C to 70°C.
• Compact Track Mount: Small footprint allows for clean DIN rail or track installation within tight control panels.

How do I switch the SC11-B between voltage and current input?
The unit utilizes a 3-position DIP switch found on the board. For 4-20mA, move all switches to the ON position. For 0-10VDC, move all switches to the OFF position.

Can I use one transformer for multiple SC11-B units?
It is recommended to use a separate, independent transformer for each signal conditioner to avoid grounding loops. If sharing a transformer, ensure the signal inputs to each SC11-B are completely independent.

What is the maximum output for driving modulating valves?
The conditioner provides a 0-20 VDC output specifically calibrated for Maxitrol Selectra modulating valves.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.