Honeywell A4021A1002 valve proving system

The Honeywell A4021A 1002 is a self-checking microprocessor based Valve Proving System (VPS). The A4021 checks the effective closure of automatic shut-off valves by measuring the pressure. differential between two valves during the test sequence. The A4021 A 1002 is specially designed to be used as proving system to check the effective closure of the valves before burner start up (pre-configuration) or at the end of a heat demand (post-configuration). 230Vac version

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