This ensures the thermostatic probe is positioned correctly within the top 6 inches of the tank to accurately sense water temperature

providing precision defrost cycle initiation to prevent harmful frost accumulation on the evaporator coils

The Johnson Controls A421ABC-04 is a line-voltage

Direct OEM Replacement: Replaces cross-referenced parts 9004470205 and 190714-000 without wiring modifications

ensuring the 120/277V 30A timer maintains accurate settings through most power interruptions

Siemens Building Technology GMA121.1P Actuator 30067439-890 This ensures the thermostatic probeThe Siemens GMA121. 1P is a heavy duty OpenAir electronic damper actuator designed for the rigorous demands of commercial HVAC systems. Engineering for reliability, this 24V spring return actuator delivers 62 lb in torque (7 Nm), making it an ideal choice for managing return air, exhaust, and face and bypass dampers in both constant and variable air volume (VAV) installations. The 2 position control (on off) logic ensures decisive operation, while the