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this high-limit safety control prevents heat exchanger fatigue by breaking the 24V or 120V circuit to the gas valve or heating elements during restricted airflow conditions
this direct replacement contactor meets ARI-780 standards
making it compatible with most standard 40VA or 75VA control transformers
When the burner compartment temperatures exceed this specific thermal limit
Johnson Controls T-4000-611 Adaptor this high-limit safety control preventsThe Johnson Controls T 4000 611 Adaptor is a critical pneumatic thermostat conversion kit engineered to transition legacy T 400 series dual temperature units to the modern T 4000 series. This Bakelite back adaptor is specifically designed for dual temperature vertical or horizontal instruments, featuring two pipehead adaptors to maintain seamless pneumatic integration. As a high performance HVAC pneumatic control accessory, it allows technicians to