this iron-body relief valve is specifically designed for non-potable hot water space heating boilers

ensuring both durability and optimal airflow for rapid thermal response

Flexible Differential: Wide adjustment range prevents short-cycling in high-load commercial environments

This kit is primarily designed for Johnson Controls VG7000 series valves and other models with a 1/4 inch stem diameter

a dedicated multi-stage controller is required

Fenwal 35-605501-003 Control Els PW 17895 this iron-body relief valve isThe Fenwal 35 605501 003 is a microprocessor based Direct Spark Ignition (DSI) control engineered for precision timing and reliable burner operation in gas fired appliances. This 24VAC module features a single trial ignition sequence (1 try) with a 7 second trial for ignition (TFI) and a 0 second pre purge, making it an ideal choice for systems requiring immediate spark response. Built for heavy duty HVACR applications, it utilizes DETECT A FLAME