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Outdoor Reset Options

Outdoor Reset Options. Basic Heating Control Modulating mixing valve control Supply temperature high limit Seasonal pump activation Boiler activation Mixing valve and pump exercising Advanced Heating Control Mixing reset (floating or variable speed output) Boiler reset

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Outdoor Reset Options

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  1. Outdoor Reset Options • Basic Heating Control • Modulating mixing valve control • Supply temperature high limit • Seasonal pump activation • Boiler activation • Mixing valve and pump exercising • Advanced Heating Control • Mixing reset (floating or variable speed output) • Boiler reset • Domestic hot water control (optional sensor required) • Mixing valve and pump exercising

  2. Outdoor Reset Options • Three Position Actuator • 24V • 3-wire • Floating action

  3. Basic Heating Control & Component Wiring 120V T T

  4. Manifold Options

  5. Zoning Options • Thermostat – Basic • 3-wire • Live anticipator • Thermostat – Setback w/ floor sensor option • 9°F manual setback • Floor sensor option high / low limit • Thermostat – Remote sensor • Seasonal pump switching capability

  6. Zoning Options • Zone Control • 5 or 6 zone control box for thermostats and powerheads • Demand or outdoor pump control • Plug and play • Powerheads • 24V (available for stainless & brass)

  7. Zone Control & Component Wiring

  8. Snow Melting Designing Systems

  9. Snow Melting Applications

  10. Snow Melting 10 Step Design • Selecting level for design criteria • Calculating the snow melting load • Calculating the tube spacing • Calculating the fluid supply temperature • Calculating the circuit information • Water/ glycol design • Calculating the flow rates • Calculating the pressure drop • Adjusting the pressure drop and flow rate • Selecting the pump

  11. Snow Melting1) Selecting the level for design criteria • Define customer intention and expectation for snowmelt system • Residential (ASHRAE level 1, 95%) • Res./Commercial (ASHRAE level 2, 98%) • Critical (ASHRAE level 3, 99%)

  12. Snow Melting Level 1 • Completely free of snow 95% of the time • Occasional snow or ice buildup • Typically 5/8" Viega Pex Barrier tubing with 9" (1/2" for small areas)

  13. Snow Melting Level 1 • Common Applications: • Residential applications • Driveways • Sidewalks • Hot tub areas

  14. Snow Melting Level 2 • Completely free of snow 98% of the time • Typical level selection • Typically 5/8” Viega Pex Barrier with 6" or 9" spacing (3/4” for large areas)

  15. Snow Melting Level 2 • Common Applications: • Commercial and light commercial applications • Public access areas to buildings • Handicapped ramps • Commercial stairways

  16. Snow Melting Level 3 • Completely free of snow 99% of the time • Advanced Snow Melt Control for sensitivity • System must melt snow with no accumulation • Typically 5/8” Viega Pex Barrier tubing with 6" spacing (3/4" for large areas) • System idling is often needed for quick response

  17. Snow MeltingLevel 3 • Common applications: • Critical applications • Hospital emergency ramps • Helipads • Access areas for emergency vehicles (fire stations, etc.) • Areas deemed critical for public safety

  18. Snow Melting Load • Select location and level for Btu/h ft² • Values do not include back and edge losses

  19. Snow Melting Back and Edge Heat Loss

  20. Snow Melting3) Tubing Spacing • Select the tube size • Note the max. circuit length • Note the recommended tube spacing under the load column

  21. Snow Melting4) Fluid Temperature • Select the required Btu/h ft² load • Based upon tube spacing find the required fluid supply temperature

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