Resideo HZ221 Panel 340155-7026 The Watts 0780004 (Series 500-12)

The Watts 0780004 (Series 500-12) is a heavy-duty 1/2 inch mechanical float valve designed for high-capacity flow control in demanding commercial

The stainless steel generator cover and flame ring surrounding the element ensure consistent 750 millivolt output and long-term reliability against flame impingement and oxidation

the switch itself may have shifted out of calibration and require replacement

or the inability to maintain a stable flame at high-fire rates

55" WC to match Lennox OEM specifications for optimal safety and performance

Resideo HZ221 Panel 340155-7026 The Watts 0780004 (Series 500-12)The Resideo HZ221 TrueZONE panel is a dedicated 2 zone control system engineered specifically for single stage heat pump applications with auxiliary heat. Designed to streamline the integration of zone dampers and HVAC zoning, this panel features a robust push pin terminal design that eliminates the need for specialized tools during wire termination. It supports conventional heat pump systems (1H 1C) and manages the transition to emergency heat via a