SR501-4 1 Zone Switching Relay Gas Regulator It adapts the appliance collar

It adapts the appliance collar to the Z-Vent pipe

Hydro-Air fan coils

Can also be used in constant speed mode for zoning with circulators

Normally closed actuator: Z151000

1 - Combustion air duct with clamps

SR501-4 1 Zone Switching Relay Gas Regulator It adapts the appliance collarTaco SR501 Single zone switching relay is a standard equipment for every installer. It can easily replace any brand made by any manufacturer, and will even fit into the existing metal enclosure without rewiring incoming connections. The SR501 single zone switching relay is UL and CSA listed, uses a standard ice cube replaceable relay and is compatible with conventional and programmable thermostats. External indicator lights provide instant diagnostic