301P - 1 Zone Switching RelayZone Control Brochure Submittal Sheet Installation Operation Manual Tekmar 304V Zone Valve Control, Four Zones with Priority The Switching Relay 301P connects to one thermostat and operates a circulator and boiler to provide heating to a hydronic heating system. The 301P includes optional exercising to prevent circulator seizure when not in use, and optional post purge operation maximize energy savings. Features Compatible with all low voltage
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