303V, 3-Zone Valve Control w/ Priority, Expandable Tekmar
303V, 3-Zone Valve Control w/ Priority, Expandable Tekmar
303V, 3-Zone Valve Control w/ Priority, Expandable Tekmar
303V, 3-Zone Valve Control w/ Priority, Expandable
Brand: Tekmar
Part#: 303V
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Description

Tekmar 303V Zone Valve Control allows to connect up to (3) thermostats and operates (3) zone valves, providing heating to a zoned hydronic or radiant heating system. Zone 1 has an optional priority over Zones 2 and 3 and can operate either a zone valve or a circulating pump to provide heat to an indirect hot water tank. 303V also includes optional circulator exercising and post purge operation of the domestic hot water tank. Compatible with all thermostat and zone valve brands.

Features:
  • Compatible with all 24V thermostat brands (Tekmar, Honeywell, etc.)
  • Compatible with all brands of 2, 3 or 4-wire zone valves (Taco, Honeywell, Caleffi, etc.)
  • Zone priority and unlimited zone expansion
  • RoomResponse signal for energy efficiency
  • Includes priority override, pump exercising and post purge
  • External LED indicators for zones, priority, end switch and RoomResponse
  • Fused pump and transformer protection (includes two spare fuses)
  • CSA approved

Technical Specifications:
  • Zones: 3
  • Control: Microprocessor Control
  • Power supply: 115 VAC, 60 Hz, 11 A
  • Transformer Rating: 40 VA at 24 VAC
  • Control load: 7 VA at 24 VAC
  • Fuses: T5A, 250 V slow blow glass fuse, two spare fuses included
  • Zone valve outputs: 24 VAC, 2 A max each, one transformer 33 VA, two transformer 73 VA
  • Zone valve end switch: 24 VAC
  • Pump relays: 230 VAC, 5 A, 1/3 HP
  • Boiler XX end switch: 24 VAC, 5 A
  • DHW end switch: 24 VAC, 5 A
  • Mod boiler output: 0-10 V 500 ohm min load impedance, 4-20 mA 1 k ohm max load impedance
  • Materials: ABS Plastic (Cover), Galvanized Steel (Base) NEMA type 1
  • Dimensions: 8-3/16" x 10-11/16" x 2-3/8"
  • Packaged weight: 5 lbs

Warranty:
3-year warranty

Documents

Write a Review
Helpful? Yes 1 No
Verified Purchase
Easy to install, simple wiring works well.
I replace a Taco ZVC406-4 with this that was controlling 4 valves and 2 pumps on a single circuit which had stopped activating the pumps. The install was way easier and totally straightforward. The price was also favourable. Works great.
Zones: 4
By Robert (from Point roberts, WA) on 11/22/2023
Helpful? Yes 1 No
Verified Purchase
Easier than a Taco
The supply houses here all sell Taco control boxes, but I have had many fail recently so I decided to try another brand. The Tekmars are easier to wire because you don't have to connect the transformers or run a hot wire to the pump end switch. Only time will tell if they last as long or longer. The price at Pexuniverse is also reasonable.
Zones: 4
By Daniel (from Arroyo hondo, NM) on 10/11/2023

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