Maxitrol SC30 Signal Conditioner

The Maxitrol SC30 Signal Conditioner is a specialized interface module designed for indirect fired gas applications utilizing 2-speed inducers and 2-stage gas valves. Effectively bridging 0-10VDC BMS signals to the 0-20VDC output required by Maxitrol Selectra M/MR series gas valves, the SC30 ensures linear modulation and precise system coordination. This track-mounted controller features an integrated N.O. relay for inducer speed switching and gas valve staging, preventing common ignition issues associated with low gas input. For customized burner sequencing, technicians can calibrate the adjustable startup delay (0–30 seconds) and the startup voltage output (5–15 VDC). Engineered for reliability in commercial HVAC systems and industrial burners, the SC30 eliminates signal drift and improves thermal efficiency by maintaining consistent gas flow control through high-pressure conditions up to 5 PSI.

Key Benefits for Technicians

• Precise Signal Conversion: Accurately transforms 0-10 VDC input to 0-20 VDC output for seamless compatibility with Selectra modulation systems.
• Enhanced System Sequencing: Integrated relay manages 2-speed inducer motors and staging, ensuring safe burner light-off and stable combustion.
• Field-Adjustable Parameters: Customizable startup delay and voltage output allow for fine-tuning based on specific appliance venting and load requirements.
• Simplified Installation: Compact track-mounted design fits efficiently within control cabinets, reducing wiring complexity and labor time.
• Industrial Durability: Built to withstand commercial environments, supporting multi-stage gas burner configurations and high-inlet pressure settings.

Common Questions

Is the SC30 compatible with 4-20mA control signals?
No, the SC30 is specifically designed for 0-10VDC analog inputs. If your controller outputs a current signal, a resistor or a different signal conditioner may be required to interface with the 0-20VDC Selectra valve requirement.

How does the startup delay function improve burner safety?
The adjustable startup delay (0-30 seconds) ensures the inducer has reached the appropriate speed and the heat exchanger is purged before the Maxitrol gas valve opens, preventing delayed ignition or soot accumulation.

Can this unit be used with direct-fired heaters?
The SC30 is optimized for indirect fired gas systems using 2-speed inducers. For direct-fired applications, always verify the specific signal requirements of the Selectra electronic modulation system being utilized.

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.