Zoning System Design Manual Zoning Made Effortless 70-2321-03
Zoning System Design Manual Introduction The Concept of Zoning The basic principle of forced air zoning is to allow one HVAC system to be controlled by multiple thermostats, heating and cooling a building in zones rather than as a whole. This makes homes and businesses more comfortable. When combined with setback thermostats, zone setback is possible, resulting in significant energy savings.
Zoning System Design Manual Introduction Fig. 2 depicts a typical residential layout with three zones. Zoning provides two key benefits: • Customer Comfort: heating and cooling where you want it, when you want it. • Energy Savings: heat and cool only zones that are occupied. In the following pages you will learn how to apply the principles of forced air zoning in new and existing projects, creating a more comfortable indoor environment.
Zoning System Design Manual Plan The Zones In planning a zone system, here's what you need: Panel Thermostats • To Operate Dampers and Equipment • Programmable or Non Programmable • Transformer to power panel Dampers • Round/Rectangular Bypass and Discharge Air Temperature Sensor: • To Prevent Static Pressure Buildup • DATS protects Equipment 1 Divide the Home Into Zones There are a number of ways to divide a house into zones: by floor, in groups of rooms adjacent to each other, rooms grouped
Zoning System Design Manual Ducts and Dampers 2 Size the Ductwork In New Construction: ductwork is sized as usual for the size of the home; trunks are sized for the amount of air going to the zone. Ductwork should be designed normally, typically .10 or .08 in. w.c./100 ft. Proper duct design of a zoned system will: • Maintain proper airflow through the HVAC unit when only one zone is open. • And maintain proper airflow to all zones when all are open.
Zoning System Design Manual Bypass Dampers and DATS Size the Bypass Damper 4 Install between supply and return. All zoning systems should be installed with a supply-to-return bypass damper. A Static Pressure Regulating Damper (SPRD) is used to bypass excess airflow from the supply duct into the return duct. Table 1. SPRD Dimensions.
Zoning System Design Manual Bypass Dampers and DATS Alternative Bypass Methods If there is no space for bypass ductwork, the zone dampers can be set to allow some air to leak. By setting the larger zone dampers to a minimum position, excess air pressure can be relieved even when only one zone is calling. This method does not typically affect room temperature, but the homeowner should be advised that air will be coming from these registers even when that zone is not calling.
Zoning System Design Manual Zone panel Install the Panel 5 Mount on return, stud, wall, or roof truss. Zone Panels should not be exposed to weather or installed in a location where they might get wet. Like a damper, they must be accessible for service, if required. Select a conventional zone control panel or communicating zone panel using Table 2 and 3. Notice that no fossil fuel kit is necessary for the HZ432 in dual fuel applications, but is necessary for all other panels. Table 2.
Zoning System Design Manual Zone panel The zone panel is typically installed near the indoor unit, in a garage, crawl space, basement, or attic. Zone panels are often installed on the return air duct. However, in some heat pump applications, the homeowner or building occupant may require access to the panel to change SPRD BYPASS DAMPER ZD SERIES into the emergency heat mode. To meet these needs, ZONE DAMPERS install the panel in a utility closet or other convenient area where the panel is easily accessed.
Zoning System Design Manual Retrofit Applications For retrofit applications, first you have to ensure that the duct system is adequate for room/zone loads, and that the existing HVAC system is properly sized to deliver heat/cool. After that, planning the zone system is very similar to new construction. Rigid Duct, Rectangular Sheet Metal Duct, Knockdown (KD) Duct Using a retrofit round damper (RRD) significantly reduces labor—it installs in a fraction of the time—and overall system installation cost.
Zoning System Design Manual Commercial zoning Zoning for commercial buildings makes just as much sense as zoning for residential buildings: in a large office building, each office suite could have its own zone, giving each occupant the ability to set the heat/cool to his or her comfort. Zone Design While a typical residential building might have a system of 5 tons or less, commercial buildings typically have much larger (up to 20 ton) HVAC units.
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