The Switching Relay 303P connects up to three thermostats and operates circulators to provide heating to a zoned hydronic heating system. Zone 1 has optional priority over zones 2 and 3 and can be used to provide heat to an indirect domestic hot water tank. The 303P includes optional exercising to prevent circulator seizure when not in use, and optional post purge operation of the last operating zone to maximize energy savings. The 303P provides a RoomResponse™ signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency
Features
LED for each zone, priority, end switch and RoomResponse™, away signal shared between tekmar thermostats
Fuses protect transformers and pumps
Priority override, pump exercising
Two spare fuses included
Pump exercising, post purge
CSA approved
Unlimited zone expansion, zone priority
RoomResponse signal, compatible with all low voltage thermostats
Four ground screws, Top, bottom and back conduit knockouts
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