ACV Gas pressure switch 537DC000

This pressure switch from ACV (SKU 537DC000) is a safety component that monitors gas pressure in the gas train. It is intended for the following ACV boiler models: Prestige 75 Solo MK2, Compact Condens 45, and HeatMaster 100 TC (also referenced as Prestige HMTC). When gas pressure falls outside the permitted range, the switch signals the burner control to prevent the gas valve from opening, helping to protect the boiler.

Gas pressure switches of this type are selected by matching the medium, the switching range, the differential, the connection type (thread or hose spigot), the contact rating, and the safety approval class. They are typically installed between the gas filter and the gas valve, with the electrical contacts wired to the burner control. Before ordering, measure or compare these parameters with the original switch.

Common failure modes for this type of switch include a torn diaphragm, a blocked impulse tube, or a drifted setpoint. When any of these occurs, the switch may fail to confirm correct gas pressure, causing a flame safeguard lockout. This can be mistaken for an ignition fault, so check the impulse tube and setpoint before assuming a burner problem.