specifically the 400 and 500 series burners

Ensure your system's pressure and temperature requirements align with the valve's 1015 psi max rating

5-second flame proving window required for safe burner stabilization and consistent heat exchange

Key Benefits: Optimized Compressor Longevity: Eliminates liquid refrigerant slugging and ensures proper oil viscosity for immediate lubrication during cold starts

10" WC requirement on your unit's rating plate

Danfoss 020-1042 Check Valve 320788-703 specifically the 400 and 500The Danfoss 020 1042 is a high performance NRV 12 check valve designed for integration into commercial refrigeration and air conditioning systems. Engineered for durability and precision, this 1 2" flare check valve ensures unidirectional flow and prevents back condensation from warm system components to the evaporator. Featuring a built in damping piston, the NRV 12 is ideal for installation in lines with high pulsation, such as compressor discharge