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For multi-unit cascading setups
use terminal 4
Optimized Refrigerant Flow: Clean internal surfaces and smooth transitions reduce pressure drop across the liquid side of the system
Verify the 24V supply to the module and ensure the burner is properly grounded
Watts 0121325 Valve 320788-704 For multi-unit cascading setupsThe Watts 0121325 (Model 1XL 4 150) is a professional grade 1 2 inch T&P relief valve engineered for critical temperature and pressure protection in water heater and storage tank applications. This ASME rated safety valve is designed to manage thermal expansion and prevent over pressurization in systems with a maximum heat input of 15,000 BTU hr. Featuring a 4 inch extension thermostat with a specialized thermo bonded coating, the 1XL 4 ensures