Siemens Building Technology ZM121/A Control Freon Most start capacitors fail due

Most start capacitors fail due to overheating from excessive cycling

Direct Replacement: Simplifies field service with standard connectors

starving the coil

it detects the microamp signal generated by the furnace flame to confirm a safe ignition

Siemens Building Technology ZM121/A Control Freon Most start capacitors fail dueThe Siemens Building Technology ZM121 A Control is a ruggedized terminal housing signal transducer designed for the precise regulation of magnetic valves in high performance HVACR and industrial processes. This Phase Cut Interface acts as a dedicated power amplifier, converting either a 4 20mA current signal or a 0 20V phase cut control signal into a reliable 0 20V DC phase cut output. Engineering for field durability, the ZM121 A Siemens module