Maxitrol SC11S-B Conditioner

The Maxitrol SC11S-B is a professional-grade analog signal conditioner designed for precise gas modulation control in both direct and indirect-fired HVACR systems. As the direct replacement for SC11S, this track-mounted component integrates seamlessly into existing Maxitrol Selectra series installations. It is engineered to accept standard 4-20mA or 0-10 VDC input signals, converting them into a regulated 0-20 VDC output to drive modulating gas valves. One critical technical feature of the SC11S-B conditioner is the adjustable low fire start timer, which ensures the modulator output is fixed during the initial start sequence for optimal combustion stability. This HVAC signal converter supports a maximum load of 1.8 A and requires a 24V AC, 20 VA power supply. When deploying the Maxitrol modulating valve controller, ensure that the transformer secondary is not grounded to prevent internal damage to the circuitry.

• Universal Field Integration: Features an on-board 3-position DIP switch for easy toggling between 4-20mA and 0-10 VDC input protocols.
• Enhanced System Stability: The integrated low fire start timer prevents nuisance lockouts by maintaining a stable valve voltage during the ignition cycle.
• Multi-Valve Capability: Designed with a high output capacity to drive multiple Selectra modulating valves simultaneously from a single control signal.
• Rugged Design: Track-mounted for rapid installation in control cabinets, with an operations range of -40° to 158°F.

Is the SC11S-B compatible with older SC11S installations?
Yes, the SC11S-B is the direct replacement for the legacy SC11S model and fits the same track-mounted footprint for straightforward field swaps.

How do I configure the input signal type?
Input selection is handled via the internal DIP switches. For 4-20mA operation, all switch positions should be set to "on," while 0-10 VDC requires all positions to be "off."

Can I use a grounded transformer with this unit?
No. To avoid damaging the signal conditioner, the transformer secondary must not be grounded in any part of the external circuit.

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.