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Efficient HVAC Control System Operation Guide

Learn how to optimize heating and cooling strategies by adjusting setpoints and managing terminal loads to ensure comfort and energy efficiency in commercial spaces. Understand the prioritization of zones for effective climate control.

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Efficient HVAC Control System Operation Guide

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  1. Discharge air temp information is broadcast to zone controllers via E-Bus Discharge Air Temp DAT DAT DAT TL TL TL Rapidzone Operation: Network Data Sharing RTU Z1 Z2 Z3 • Terminal load information is sent to RTU controller via E-Bus Terminal Load

  2. DAT in DAT Suitable? MOD Open Y N Occupied mode? Damper Min Pos Y N Damper Closes Zone Controller Operation: DAT Control

  3. Setpoint Knob Operation • Setpoint knob determines centre of deadband between heating and cooling Example: • deadband is set for 6° • knob set for 73° • heat setpoint becomes 70 ° • cool setpoint becomes 76 ° • deadband exists between 70 ° - 76 ° Heating Setpoint Cooling Setpoint Deadband 73 70 76

  4. Terminal Load: zone deviation from setpoint Terminal Load is broadcast from each zone to RTU via E-Bus < 20 % zone is satisfied > 20 % zone requires heating or cooling Zones can be configured as ‘priority’, terminal load multiplied by 1.5 163% Cool On +20 % Deadband 0 % Zone Satisfied -20 % Heat On -163% Rapidzone Operation: Terminal Loads

  5. RTU will run in cooling mode until Zone 3 is satisfied (TL drops below 20%) Zones 1 and 2 remain closed or in minimum position Z1 Z2 Z3 TL + 18 TL + 18 TL + 25 Terminal Load RTU

  6. Z1 Z2 Z3 TL - 25 TL + 18 TL + 25 Terminal Load RTU • RTU will alternate between heating and cooling until: • zone 1 heating satisfied • zone 3 cooling satisfied • Zone 2 remain closed or in minimum position • Length of Heat / Cool runtime entered by Rapidzone software

  7. Z3 TL + 25 Terminal Load RTU • Zone 2 configured as priority zone, terminal load multiplied by 1.5 • RTU will alternate between heating and cooling until: • zone 2 heating satisfied • zone 3 cooling satisfied • Zone 1 remain closed or in minimum position • Length of Heat / Cool runtime entered by Rapidzone software Priority Z1 Z2 TL + 18 TL - 18 x 1.5 TL - 27

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