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Zoning Reference Guide Part No. RG-0508-001 Table of Contents Introduction 1 Br

Zoning Reference Guide Part No. RG-0508-001 Table of Contents Introduction 1 Braeburn Zone Systems: Comfort on Demand 1 What is a Zoning System? 2 The Braeburn Advantage 4 The Best Value in Zoning Today 4 Understanding Zoning Duct Systems 5 Understanding Bypass System Ductwork 6 What is a Bypass System Duct? 6 Eliminate the Bypass by Oversizing Each Branch 7 Install a Barometric Bypass 7 Install an Electric Bypass 8 Understanding Zone Controllers 9 Using the Zone Panel with Multi-Stage Equipment 10 Understanding the Zone Controller Display 11 Conﬁ guring Zone Panels 14 Additional Features for the 3-Zone Panels 16 2-Zone and 3-Zone Panel Checkout 16 2-Zone Panel Comfort Features 17 2-Zone Panel Economy Features 17 3-Zone Panel Comfort Features 17 3-Zone Panel Economy Features 17 Copyright© 2008 by Braeburn Systems LLC All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of Braeburn Systems LLC. This guide is intended to be used as a source of general information and reference guide about zone systems and their associated equipment. It provides an overview of the practices and standards associated with zone system. This guide is not intended to be used as an instruction manual by untrained persons, nor to be used as a standard for design, manufacturing, testing, or installation of zone systems. Although every effort has been made to make the information in this publication accurate, Braeburn assumes no liability for damages that may result from the use of this guide. Part No. RG-0508-001 1 The Braeburn Zoning Reference Guide Introduction Braeburn Zone Systems: Comfort on Demand Given the opportunity, more than half of building owners want to improve the comfort and energy effi ciency of their home or business. 79˚ 69˚ 75˚ Comfort Why are so many owners dissatisfi ed with their comfort of their building? Even the best thermostats will only monitor the temperature in the area around the thermostat. Now consider second and third stories or interior walls that divide a building into rooms with different solar, glass, or wind loading. The result can be a 10 degree or more difference between the area around the thermostat and the rest of building. The result of having a large temperature spread is uncomfortable occupants. According to industry data, even a 5 degree difference will cause a four- fold increase in complaints. Zoning solves this problem by reducing or completely eliminating the large temperature variation that can come from uneven HVAC loads. Occupant comfort is increased, and complaints can be reduced. The Braeburn Zoning Reference Guide 2 Part No. RG-0508-001 Energy Savings Up to 30 percent of the costs of heating and cooling can be reduced by making sure areas are not over or under air conditioning. Usually, parts of buildings are improperly air-conditioned when the centrally located thermostat responds to the temperature around the thermostat and areas away from the thermostat are already too hot or too cold, or do not need to be conditioned. Costs are also increased when the areas away from the thermostat are not occupied. Without zoning control, the average heating or air conditioning system will send conditioned air throughout the entire house or building even if there are no plans for the area to be occupied or used. Zoning solves this problem by guiding conditioned air to the areas that are in use or actually require air-conditioning. Using setback thermostats will result in additional savings by making sure the zone panel only calls for conditioning at the right time. The result can be up to a 30 percent savings in energy costs. What is a Zoning System? A zoning system is made up of the following items: THERMOSTAT in each zoned area. The thermostats can be off-the-shelf, single stage, programmable or non-programmable units. They do not need any special connections or settings. ZONE CONTROL PANEL with a power transformer. Zone panels run off the same kind of power transformer as thermostats and air conditioning equipment. The zone control panel is the “brains” of the system, and has a built in computer to monitor the thermostats, the HVAC equipment and to open and close the dampers. The transformer is the usual 40VA, 24 VAC type. DAMPERS for each of the zoned areas. Dampers are usually wired and powered directly from the zone control panel. The job of the dampers is open or close and let conditioned air ﬂ ow to where it is needed. The dampers can be either power open-power close or spring return with power close. Part No. RG-0508-001 3 The Braeburn Zoning Reference Guide BYPASS DAMPER for the system. Most HVAC equipment is designed to operate with air ﬂ owing through the entire system. When zoning is applied to a system, and only a few dampers are open, the bypass damper relieves excess air pressure back into the return air. SUPPLY AIR TEMPERATURE SENSOR. To help ensure the system runs at the proper temperature when only a few dampers are open, a supply air temperature sensor may be used by the zone panel to moderate the system output. SYSTEM DUCTWORK AND HVAC EQUIPMENT. Properly sized ductwork and equipment is the key to a successful zoning installation. Cost savings will be made when installing one properly sized HVAC system with zoning verses installing two or more separate systems. A later section of this guide will help your understanding of the special requirements of ductwork for zoning systems. The Braeburn Zoning Reference Guide 4 Part No. RG-0508-001 The Braeburn Advantage The Best Value in Zoning Today Braeburn is one of the fastest growing indoor comfort and climate control manufacturers in the United States. Our dedicated team of specialists will help provide the best value for your customers’ application requirements. Braeburn products are available to contractors via our global network of HVACR distributors. Founded in 2001, our corporate headquarters is located in Montgomery, Illinois – just west of Chicago. This facility is the central hub for all of our customer service, engineering, and business activities. Braeburn offers a complete line of zone control products that are shipped to our global customers from our modern UPS Supply Chain Solutions distribution center in Louisville, Kentucky. Our thermostats, zone panels, round dampers, and accessories generally ship within 24 hours from our main distribution center in Louisville. Rectangular dampers are custom made to order and shipped within 72 hours from our manufacturing facility in Lubbock, Texas. At Braeburn, we’re committed to providing you the quality you would expect from a world class company. Our Quality by Design product philosophy focuses on core engineering, manufacturing, and reliability testing processes to ensure you receive the product quality you can count on with every job! From our Builder and Premier thermostats to our complete line of zone controls, we provide solutions to lower energy costs and increase comfort in any home or business environment. Our innovative value-added features, reliability, and contemporary designs make us the brighter choice in indoor comfort and climate control. It’s easy to see why Braeburn is The Best Value in Zoning Today. Part No. RG-0508-001 5 The Braeburn Zoning Reference Guide Understanding Zoning Duct Systems When designing and installing zoned ductwork, follow all codes and regulations having authority over the installation. The following tips should help your zoning installation: The HVAC system must be sized to provide conditioning for the entire area. • Whenever possible, do not over or under size the equipment. Better results will be achieved with capacity control such as equipment staging. Zone controls are not intended to balance air fl ow. Using good design practices • and a properly balanced fl ow will give the best results. Areas that have extreme differences in temperature that would require constant • opposite calls may get better results with additional HVAC equipment. Opposite mode calls work best with zoning when the calls are transition in nature rather than constant opposite modes. When determining duct sizes for zoning, we recommend both the “whole building • load calculation” as well as a “room-by-room load calculation”. Once the total CFM of the system has been determined, size the dampers using • the damper chart below. Consider using at least the design CFM to leave margin for the maximum CFM when multiple dampers are closed. The total CFM of the system should be at least the total design CFM of the dampers. The duct system for each branch should be designed to accommodate the • maximum design CFM for each damper. Following this guideline will help ensure that the system is quiet even when only a single zone is receiving airfl ow. Damper Sizing Chart Damper Size Design CFM Maximum CFM 6 Inch 100 200 7 Inch 150 250 8 Inch 200 300 9 Inch 300 450 10 Inch 400 600 12 Inch 600 900 14 Inch 1000 1400 16 Inch 1500 2000 The Braeburn Zoning Reference Guide 6 Part No. RG-0508-001 Understanding uploads/s3/ zoning-reference-guide.pdf