if the capacitance has drifted more than 5-10%

Always match the OEM specification of

including the FM1D14 and FM1D20

Durable Construction: Manufactured from industrial-grade plastic to withstand frequent adjustments in commercial and residential HVAC environments

If the vent is clear but the circuit remains open

Schneider Electric (Erie) VS3315 Valve Body Els PW 17895 if the capacitance has driftedThe Schneider Electric Erie VS3315 Valve Body is a robust 3 4 inch sweat 3 way zone valve body engineered specifically for high performance hydronic and steam applications. Designed as part of the versatile Erie PopTop series, this 5. 0 Cv valve body provides the high flow capacity required for demanding commercial and residential zoning. The forged brass construction and nickel plated stem ensure durability in two position steam valve body