000 BTU models (like the HSB09611) built both before and after June 2007

As a direct replacement for part 2272133

making it a reliable choice for field replacements

the VEZ-4202BMBN delivers field-proven performance and straightforward zone valve troubleshooting through its simplified two-wire configuration

Designed to maintain precise control logic within older Barber Colman architectures

Johnson Controls T-4506-9007 Pneumatic Thermostat Freon 000 BTU models (like theThe Johnson Controls T 4506 9007 is a dual temperature, direct acting pneumatic thermostat designed for precision climate control in commercial HVAC systems. Operating within a setpoint range of 12 to 30 degrees Celsius, this unit is engineered for horizontal mounting and provides reliable pneumatic room control for heating and cooling transitions. As a dual pressure thermostat, it utilizes a bi metal sensing element to maintain tight differentials,