Description
The Tekmar 303P is a three‑zone switching relay designed for hydronic heating systems. It accepts up to three low‑voltage (24 V) thermostats and controls up to three circulators. Zone 1 has optional priority over zones 2 and 3, which makes it ideal for configurations with an indirect domestic hot water load. The control also provides a RoomResponse™ output signal for modulating‑condensing boilers to optimize comfort and efficiency.
Features
- Supports up to three thermostats and three pumps
- Priority override on Zone 1 for indirect domestic hot water applications
- Pump exercising to prevent circulator seizure when idle
- Post‑purge of last operating zone to increase energy savings
- RoomResponse™ signal output compatible with modulating‑condensing boilers
- LED indicators for each zone, priority status, end‑switch and RoomResponse™
- Top, bottom and back conduit knockouts for flexible wiring
- Fuses protect transformer and pump circuits; two spare fuses included
- CSA C / US listed, indoor use only
