Johnson Controls DMPR-RS318 TS-150 High Limit Firestat Manual Reset

The Johnson Controls DMPR-RS318 is a TS-150 high limit firestat designed for use with fire and smoke damper systems in commercial HVAC applications. This UL-classified heat-responsive device provides critical overheat protection and enables dynamic smoke control capabilities in engineered fire safety systems.

Key Features:

• Manual reset mechanism for safe reactivation after fire events
• High limit temperature sensor prevents damper reopening above safe thresholds (typically 250°F/121°C or 350°F/177°C)
• Allows fire/smoke dampers to reopen after initial heat closure for dynamic smoke management
• Compatible with both electric and pneumatic actuator systems
• Provides positive damper position indication for fire command systems
• Manufactured in the USA

The TS-150 firestat is essential for applications requiring reopenable damper operation, such as stairwell pressurization and multi-floor smoke control systems. Upon detecting excessive duct temperatures, the device closes and locks the damper, preventing smoke and flame spread through HVAC ductwork. Once fire conditions cease and temperatures return to safe levels, the damper can be manually reset to restore normal operation.

This component is designed for professional installation in accordance with local fire safety codes and UL standards for fire protection equipment.