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The Johnson Controls A19ABC-41 Utility Thermostat is a high-performance
High Compatibility: Standard 10K Ohm Type II curve matches most industry-standard controllers from major manufacturers
Universal 24V Logic: Compatible with most standard 24V control circuits typically found in Lennox-brand air handlers and furnaces
ensuring a seamless fit with the secondary heat exchanger
Schneider Electric (Barber Colman) MK-4621-422 Actuator 30067439-890 The Johnson Controls A19ABC-41 UtilityThe Schneider Electric MK 4621 422 is a heavy duty pneumatic valve actuator designed for precise proportional control in HVAC systems. Engineered with an 11 square inch effective area, this spring return actuator provides reliable linear movement for 1 2 inch nominal stroke applications. It operates on a specific 10 to 11. 25 PSI nominal spring range, making it ideal for sequencing and precise throttling of steam or water valves. The rugged NEMA 1