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Can I use an aftermarket L220F switch instead of the 49K71
replacing the integrated furnace control is the standard solution
allowing for vertical shaft-up or shaft-down installations
How do I size the bypass for my system
Use a multimeter to verify 24V at the valve output during a call for water
Resideo HPSR104 Switching Relay 322838-754 Can I use an aftermarketThe Resideo HPSR104 is a robust four zone switching relay designed for professional hydronic applications. This 120V pump zoning panel provides precise control for up to four circulator pumps, integrating a dedicated priority zone for domestic hot water (DHW) calls. Engineered for versatility, it is fully compatible with most thermostats, including power stealing, electromechanical, and modern smart thermostats like the T6 Pro. Each thermostat