this unit is a direct replacement for the legacy 540-136 cable assembly

Engineered for multi-stage HVAC systems

By adhering to original specifications

This single-pole single-throw (SPST) switch utilizes 1/4 inch quick-connect terminals for efficient field wiring

80" WC (Water Column) pressure rating

Resideo 50028004-001 Cover 322838-753 this unit is a directThe Resideo 50028004 001 Cover is a critical field service component designed for the Honeywell TrueSTEAM Series, specifically compatible with HM506 Series, HM509 Series, and HM512 Series humidifiers. As a veteran grade TrueSTEAM replacement cover, this rugged plastic enclosure serves as a primary shield for the unit's internal electronic control board and solenoid connections. In the field, a cracked or missing front enclosure can compromise the