The Maxitrol A1010U Amplifier is a high-performance 24Vac universal Selectra amplifier engineered for precise flame modulation in commercial and industrial indirect-fired heating systems. As a veteran-grade replacement part, this unit serves as the universal Selectra amplifier for legacy Series 20 and Series 21 systems, providing integrated high fire ignition and low-fire start capabilities essential for consistent burner performance. It is designed to drive Maxitrol Series 21 and Series 20 modulator-regulator (MR) valves, supporting single or multi-furnace configurations with a relay rated up to 3.5 Amps max. This 24Vac gas amplifier effectively replaces obsolete models A1010A, A1010B, A1011A, and A1011B, streamlining your service inventory. Professionals rely on the A1010U for its field-selectable high fire duration (0, 5, or 25 seconds) and its compatibility with the T115 override thermostat and TS10765 inlet air sensors. Whether you are maintaining make-up air units or industrial ovens, this HVAC amplifier module ensures tight temperature control by converting sensor inputs into a precise DC voltage signal for atmospheric burner modulation. Key Benefits for Contractors: Universal Replacement: Directly replaces multiple legacy Maxitrol amplifiers including A1010 and A1011 series models. Selectable Ignition: Features field-adjustable high fire ignition intervals to optimize burner start-up sequences. High Load Capacity: Robust internal relay manages up to 3.5 Amps, suitable for controlling up to four furnaces in parallel. Diagnostic LEDs: Integrated Power "ON," Modulating Valve Output, and Auto Gas Valve indicators for rapid field troubleshooting. Precise Modulation: Engineered for industrial gas control applications requiring minimal hysteresis and linear response across the modulation range. Common Questions & Answers: What is the primary function of terminal 5 and 7 on the A1010U? Terminals 5 and 7 are typically used for specific circuit configurations, such as the R55 jumper. For Series 21 systems, the zero-ohm jumper must remain present, whereas some Series 20 configurations require it to be clipped. Always verify your specific wiring diagram before final power-up. How do I verify if the amplifier is providing the correct output to the MR valve? Measure the DC voltage across terminals 1 and 2. Near zero volts DC indicates a call for high fire, while a reading above 14 volts DC typically represents low fire or minimum modulation. Can this unit be used with direct-fired heating systems? The A1010U is specifically designed for indirect-fired equipment with atmospheric burners. For direct-fired applications, verify requirements for Series 14 or 44 controls to ensure proper safety and performance standards are met. 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.
