If you observe downstream pressure creep (where the pressure rises while no water is running) or if you see water leaking from the spring cage weep hole

The slow-open characteristics ensure smooth burner transitions

the arrow on the Danfoss 023Z5054 label must always point in the direction of refrigerant flow towards the expansion device

Precise Actuator Control: Dual floating or digital control outputs support 3-point floating actuators or on/off heating and cooling relays

Fireye MP230 Module R-407C If you observe downstream pressureEnsure precise burner sequencing and safety with the Fireye MP230 Programmer Module. Designed as a direct plug in component for the Fireye Modular M Series II system, this module provides the critical logic required for automatic ignition and continuous flame monitoring. It is a selectable timing programmer, allowing technicians to field configure purge intervals (5, 7, 30, 60, or 240 seconds) and Pilot Trial for Ignition (PTFI) durations (5 or 10