Zone Control Basics

• 1. Learning CenterZone Control Types and ApplicationsZONE 1THERMOSTATZONE 2THERMOSTAT ZONE 1 DAMPER DISCHARGE AIR SENSOR ZONE CONTROLZONE 2LOGIC PANELDAMPERTRANSORMERFURNACEIntellectual rights apply Jackson Systems, LLC 2011

2. Learning CenterZone ControlPRODUCT DEFINITION The basic principle of operation for a zone control system is to allow a single HVAC unit to be controlled by multiple thermostats strategically placed in areas called zones.Intellectual rights apply Jackson Systems, LLC 2011 3. Learning Center Zone ControlAPPLICATION USE A home or commercial building not zoned typically leaves someone uncomfortable. It is too much to expect one thermostat to provide comfortable conditions for every room. Zoning divides a home or building into areas (these areas are called zones) with common heating and cooling requirements. Each zone is controlled by its own thermostat, allowing people to be comfortable no matter where they are in the building. Intellectual rights apply Jackson Systems, LLC 2011 4. Learning CenterZone ControlAPPLICATION USE A home without zoning.Im too hot!Im too cold!Intellectual rights apply Jackson Systems, LLC 2011 5. Learning CenterZone ControlAPPLICATION USE A home with zoning.Im comfortable. Im comfortable.Intellectual rights apply Jackson Systems, LLC 2011 6. Learning CenterZone ControlAPPLICATION USE A type of zoning system that most people are familiar with is lighting. How many light switches are in a home? There are multiple light switches that turn on individual lights in each room. If lighting is zoned why shouldnt HVAC equipment be zoned? Why have one thermostat to control the temperature in an entire house? Why not have a thermostat in every room, or zone, to provide individual temperature control?Intellectual rights apply Jackson Systems, LLC 2011 7. Learning Center Zone ControlAPPLICATION USE A Zone Control System can solve comfort problems: Between different floors In finished basements In home additions In added sun rooms Between external and internal areas In bonus rooms located over garages Intellectual rights apply Jackson Systems, LLC 2011 8. Learning CenterZone ControlAPPLICATION USE Zoning also allows unoccupied areas to be maintained at lower heating or higher cooling temperatures which reduces energy usage and utility costs. With the use of programmable thermostats, individual zones can be scheduled to automatically change the heating and cooling setpoints based on an occupied and unoccupied program. When a bedroom zone is not being occupied, a lower heating and higher cooling setpoint can be maintained.Intellectual rights apply Jackson Systems, LLC 2011 9. Learning Center Zone Control PRODUCT DESCRIPTION The basic principle of operation for a zone control system is to allow a single HVAC unit to be controlled by multiple thermostats strategically located in areas called zones. The logic panel wires to the HVAC equipment. Each zone thermostat is wired to the zone control logic panel. Zone dampers, used to control the amount of conditioned air into each zone, are also wired to the logic panel. The thermostats along with the logic panel and zone dampers receive their power from a separate 24VAC transformer.Intellectual rights apply Jackson Systems, LLC 2011 10. Learning Center Zone Control PRODUCT DESCRIPTION The operation of the dampers are controlled by the zone control logic panel which monitors the zone thermostats and places the HVAC unit in the proper mode of operation as well as controls the zone damper positions based on heating, cooling or ventilation demand. Intellectual rights apply Jackson Systems, LLC 2011 11. Learning CenterZone Control ZONE CONTROL PANELS A zone control panel provides the basic logic required in using multiple zone thermostats and zone dampers with a single HVAC unit. Selecting the right zone panel involves knowing the application specifics and provides the base for selection of the remaining system components.Intellectual rights apply Jackson Systems, LLC 2011 12. Learning CenterZone Control ZONE CONTROL PANELS Requirements for selection of a zone control panel. Number of individual zones Type of equipment Single-stage Heat/Cool Multi-stage Heat/Cool Heat pump Dual fuel Type and number of zone dampers 2 wire or 3 wire Cooling tonnage Important when sizing bypass dampersIntellectual rights apply Jackson Systems, LLC 2011 13. Learning Center Zone Control ZONE CONTROL PANELS 2 Zone Panel Intellectual rights apply Jackson Systems, LLC 2011 14. Learning Center Zone Control ZONE CONTROL PANELS 3 Zone Panel Intellectual rights apply Jackson Systems, LLC 2011 15. Learning Center Zone Control ZONE CONTROL PANELS 6 Zone Panel Intellectual rights apply Jackson Systems, LLC 2011 16. Learning CenterZone ControlZONE THERMOSTATS Zone thermostats must be compatible with the equipment. Heat pump thermostats for heat pumps and dual fuelsystems. Heat / cool thermostats for conventional HVAC systems. Staging of equipment is usually thermostat controlled withthe exception of the Z-600 panel which can stage equipmentbased on thermostat demand or by an internal upstage timer. Zone thermostats can be either programmable or non- programmable.Intellectual rights apply Jackson Systems, LLC 2011 17. Learning Center Zone ControlZONE DAMPERS Basic types of zone dampers actuators: 2-wire (Power Closed/Spring Open) 3-wire (Power Closed/Power Open) When selecting zone dampers, the VA requirement of the actuator is important in properly sizing the transformer. The transformer VA rating should be equal to or greater than the VA sum of all zone damper actuators. VA = Volts x Amps Intellectual rights apply Jackson Systems, LLC 2011 18. Learning Center Zone Control ZONE DAMPERS Two position zone dampers are widely used for force air zone control applications. Two position zone dampers are either open or fully closed. The closed position can be mechanically adjusted to allow a percentage of air flow or leakage into a zone when the damper is in the closed position. This is commonly called minimum position. Intellectual rights apply Jackson Systems, LLC 2011 19. Learning CenterZone ControlZONE DAMPERS Rectangular 2 wire damperIntellectual rights apply Jackson Systems, LLC 2011 20. Learning Center Zone ControlZONE DAMPERS Rectangular dampers slide into the duct work and are available with the actuator on the side (vertical plane) or the bottom (horizontal plane) to accommodate for restriction such as duct work that is between floor joists. Intellectual rights apply Jackson Systems, LLC 2011 21. Learning CenterZone ControlZONE DAMPERS Round 2 wire damperIntellectual rights apply Jackson Systems, LLC 2011 22. Learning Center Zone ControlZONE DAMPERS Round dampers are typically mounted to rigid metal round duct and the damper can be adjusted so that the actuator is in any position. Intellectual rights apply Jackson Systems, LLC 2011 23. Learning CenterZone ControlZONE DAMPERS Rectangular 3 wire damperIntellectual rights apply Jackson Systems, LLC 2011 24. Learning Center Zone ControlZONE DAMPERS 3-wire rectangular dampers slide into the duct work and are available with the actuator on the side (vertical plane) or the bottom (horizontal plane) to accommodate for restriction such as duct work that is between floor joists. Intellectual rights apply Jackson Systems, LLC 2011 25. Learning CenterZone ControlZONE DAMPERS Round 3 wire damperIntellectual rights apply Jackson Systems, LLC 2011 26. Learning CenterZone ControlZONE DAMPERS 3-wire Retrofit damperIntellectual rights apply Jackson Systems, LLC 2011 27. Learning Center Zone ControlBYPASS DAMPERS Since forced air zone control systems are designed to be used with constant volume equipment, a bypass damper may be required. The air moving through a constant volume HVAC system does not speed up or slow down thus the static pressure remains constant. As zone dampers open and close, the system static pressure can change. A bypass damper maintains the proper system static pressure by allowing a proportional amount of supply air to be ducted back to the return air plenum. Intellectual rights apply Jackson Systems, LLC 2011 28. Learning CenterZone ControlBYPASS DAMPERS Barometric bypass damperIntellectual rights apply Jackson Systems, LLC 2011 29. Learning Center Zone ControlBYPASS DAMPERS Barometric bypass dampers utilize a mechanical counterweight attached to a shaft connected to an offset damper blade. When all zone dampers are in the open position and with the air handler running, the damper blade is closed. As zone dampers open and close, the static pressure in the supply duct changes. The bypass damper modulates open on an increase in static pressure or modulates closed on a decrease in static pressure. Excess air is ducted back to the return air plenum. Intellectual rights apply Jackson Systems, LLC 2011 30. Learning CenterZone ControlBYPASS DAMPERS Electronic bypass dampersIntellectual rights apply Jackson Systems, LLC 2011 31. Learning Center Zone ControlBYPASS DAMPERS Electronic bypass dampers utilize a motorized 24VAC, 3 wire actuator and a static pressure control with an adjustable static pressure setting. When all zone dampers are in the open position and with the air handler running, the bypass damper is closed. As zone dampers close and the static pressure increases, the pressure control sends a signal to the actuator which modulates the bypass damper open to maintain the static pressure setting. Intellectual rights apply Jackson Systems, LLC 2011 32. Learning CenterZone ControlSYSTEM PERIPHERALS High and low limit protection Since many zone control systems use bypass dampers tobypass air back into the return duct, high and low limitprotection is an important part of the system. Jackson Systems zoning panels have dedicated terminals that accept an electronic discharge air sensor. The discharge air sensor (DAS) is used for both high and low limit protection.Intellectual rights apply Jackson Systems, LLC 2011 33. Learning CenterZone ControlSYSTEM PERIPHERALS Electronic discharge air sensor (DAS)Intellectual rights apply Jackson Systems, LLC 2011 34. Learning CenterZone ControlSYSTEM PERIPHERALS When in the cooling mode, cold air that is bypassed back into the return begins to super cool the air passing through the evaporator coil. If the condition persists for any length of time, the coil will freeze. The discharge air sensor detects the drop in air temperature across the coil and at a fixed point, the zoning panel de- energizes the compressor while allowing the fan to run to prevent the coil from freezing. A time delay is also activated to prevent the compressor from short cycling as the air temperature rises above the low limit setting.Intellectual rights apply Jackson Systems, LLC 2011 35. Learning Center Zone ControlSYSTEM PERIPHERALS When in the heating mode, hot air that is bypassed back into the return begins to super heat the air passing across the heat exchanger.. If the condition persists for any length of time, the HVAC system will trip out on high safety limit. The discharge air sensor detects a rise in air temperatureacross the heat exchanger and at a fixed point, the zoningpanel de-energizes the gas valve while allowing the fan torun. This prevents the furnace from tripping on high safetylimit. Intellectual rights apply Jackson Systems, LLC 2011 36. Learning CenterZone ControlSYSTEM PERIPHERALS System transformerIntellectual rights apply Jackson Systems, LLC 2011 37. Learning Center Zone ControlSYSTEM PERIPHERALS System transformer Jackson Systems zone control panels use a separate,dedicated 24 volt transformer to power the panel,thermostats, and zone dampers. A dedicated transformer also isolates the zone panel,thermostats, and zone dampers from the equipmenttransformer. The HVAC equipment transformer should never be used to power a zone control system. Intellectual rights apply Jackson Systems, LLC 2011 38. Learning Center Zone ControlSAMPLE TEST A Zone Control System consists of multiple . . . A. HVAC Systems B. Thermostats C. High Voltage Wiring D. None of the above A Zone Control Panel is powered by . . . A. The equipment transformer B. A separate, dedicated transformer C. An underwater transformer D. An isolation relay Intellectual rights apply Jackson Systems, LLC 2011 39. Learning Center Zone ControlSAMPLE TEST A Zone damper can be . . . A. 2 wires B. 3 wires C. Rectangular D. All of the above Programmable zone thermostats can save energy through A. Occupied and unoccupied scheduling of zones B. Reduction of the HVAC system blower speed C. Maintaining the system static pressure D. None of the above Intellectual rights apply Jackson Systems, LLC 2011 40. Learning CenterZone Control Types and ApplicationsZONE 1THERMOSTATZONE 2THERMOSTAT ZONE 1 DAMPER DISCHARGE AIR SENSOR ZONE CONTROLZONE 2LOGIC PANELDAMPERTRANSORMERFURNACEIntellectual rights apply Jackson Systems, LLC 2011 41. 888.652.9663 www.jacksonsystems.comIntellectual rights apply Jackson Systems, LLC 2011