The Zone Valve Control 303V connects up to three thermostats and operates zone valves to provide heating to a zoned hydronic heating system. The 303V operates a system pump whenever a zone valve opens. Zone 1 can operate either a zone valve or a circulator to provide heat to an indirect domestic hot water tank with optional priority over zones 2 and 3. The 303V includes optional exercising to prevent circulator seizure when not in use, and optional post-purge operation of the domestic hot water tank to maximize energy savings. The 303V provides a RoomResponse™ signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.
Features
- RoomResponse™ signal, compatible with all low-voltage thermostats
- Compatible with 2, 3 and 4-wire zone valves, unlimited zone expansion
- Zone priority, priority override
- Post purge, LED for each zone, priority, end switch and RoomResponse™
- LED for each zone, priority, end switch and RoomResponse™, away signal shared between tekmar thermostats
- Four ground screws, Top, bottom and back conduit knockouts
- Fuses protect transformers and pumps
- Includes two spare fuses
- CSA approved
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