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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 Pressure Relief Dampers: Dampers • Controls circulating air in heating/cooling systems • Provides static pressure buildup relief • Round or rectangular configuration • Actuator included • No wiring necessary • Normally open/power closed actuator included Discharge Air Temperature Sensor (DAT
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 PRESSURE RELIEF DAMPERS AND DATS 4 Size the Pressure Relief Damper Install between supply and return. All zoning systems should be installed with a supply-to-return pressure relief damper. A Constant Pressure Regulating Damper (CPRD) is used to bypass excess airflow from the supply duct into the Table 1. CPRD Sizes. return duct.
Zoning System Design Manual PRESSURE RELIEF DAMPERS AND DATS Setting the Regulator The CPRD is factory set to open at approximately .5"WC." This setting is satisfactory for most installations. Some systems have higher static pressure. Test this by: 1 Make all zones call fan, heat, or cool; whichever has the highest CFM. 2 Verify that the damper position indicator points to closed. 3 If it does not point to closed: • Flip the adjustment crank out (see Fig.
Zoning System Design Manual ZONE PANEL 5 Install the Panel 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 zone control panel kit using Table 2. WIRELESS THERMOSTATS WIRED THERMOSTATS Table 2. Conventional Zone Panel Selection Guide.
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 CPRD PRESSURE ZD SERIES into the emergency heat mode.
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.
CHECK EQUIPMENT FOR CORRECT OPERATION HZ221 or HZ311 panels Call for heat or cool from each zone individually. Verify the equipment comes on and dampers go to correct position. Verify CPRD relief damper is adjusted correctly (see "Setting the Regulator" on page 7). HZ322 or HZ432 panels From the home mode, press mode button twice to enter checkout mode on zone panel. In checkout mode you can: 1 Test every heat stage. 2 Test every cool stage.
