Johnson Controls T-3111-6 Pneumatic Thermostat Refrigerant this is a non-spring return

this is a non-spring return (NSR) actuator

ensuring linear heat transfer across the coil

System Compatibility: Engineered specifically for boiler maintenance and ignition system repair on natural gas and propane boilers

upper and lower spring seats

Johnson Controls T-3111-6 Pneumatic Thermostat Refrigerant this is a non-spring returnThe Johnson Controls T 3111 6 Pneumatic Thermostat is a heavy duty, direct acting controller engineered for proportional management of steam or water valves in terminal air conditioning units. As a veteran preferred valve top mounting thermostat, this unit integrates a high sensitivity averaging bulb element (8 foot sensing area) to ensure precise environmental regulation by mitigating the effects of air stratification. Designed for "single