Robust SPST Logic: Provides a reliable normally-open circuit that closes only when proper draft is established

Accurate HVAC pressure switch calibration is essential for preventing nuisance trips or ignition failure

304 Stainless Steel Probe is hermetically sealed to prevent failure from high humidity or moisture migration in the air stream

the bottom terminals (H1-H2) are for the 24V input

the actuator will maintain its last position

Carrier HK44ER221 ECM Module 320720-756 Robust SPST Logic: Provides aThe Carrier HK44ER221 ECM Module is a critical 1 2 HP replacement component for X 13 and Endura Pro blower motors found in high efficiency Carrier HVAC systems. As a genuine OEM replacement part, this module serves as the primary motor control interface, managing speed taps and operational logic to maintain precise airflow across heat exchangers and coils. Designed for 208 230V or 115V applications (depending on system wiring), this ECM motor