Product Description
The Tekmar Controls 303P is a versatile switching relay designed for controlling up to three zones in a hydronic heating system. Its key feature is the ability to prioritize one zone over others, which can be crucial for systems including domestic hot water services. This model is particularly noted for its compatibility with modulating-condensing boilers, optimizing both comfort and boiler efficiency.
- Supports three heating zones with priority settings.
- Incorporates LED indicators for system monitoring and diagnostics.
- Enhanced with features like pump exercising and post-purge operations to maximize efficiency and longevity.
Technical Specifications
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Enclosure: ABS plastic cover, galvanized steel base, NEMA type 1.
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Approvals: CSA C US certified.
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Power Supply: 115 V AC ±10%, 60 Hz, 16 A.
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Transformer: 40 VA, expandable to 80 VA with additional transformer M3069 (sold separately).
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Fuses: T5A 250 V slow blow, two spare fuses included.
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Pump Relays: 115 V AC, 5 A, 1/3 hp, 16 A combined.
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Boiler End Switch: 24 V AC, 5 A.
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DHW End Switch: 24 V AC, 5 A.
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Modulating Boiler Output: 0-10 V DC 500 ohm min load impedance / 4-20 mA 1 k ohm max load impedance.
