Zoning Reference Guide Part No.
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 Con
Introduction Braeburn Zone Systems: Comfort on Demand Given the opportunity, more than half of building owners want to improve the comfort and energy efficiency of their home or business. 79˚ 75˚ 69˚ Comfort Why are so many owners dissatisfied with their comfort of their building? Even the best thermostats will only monitor the temperature in the area around the thermostat.
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.
BYPASS DAMPER for the system. Most HVAC equipment is designed to operate with air flowing 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.
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.
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 flow.
Understanding Bypass System Ductwork zone dampers return air ducts return air plenum supply air sensor bypass duct coil electric or barometric bypass damper furnace filtration system In many zoning installations it is necessary to install a bypass damper. A bypass damper will help the HVAC equipment maintain rated CFM past the heat exchangers and blower motor. If a system does not have a bypass, and only a few dampers are open, excess supply plenum pressure may be created.
2. Install a barometric bypass damper in the bypass duct from the supply plenum to the return air plenum. Size the bypass duct by using a formula that subtracts the smallest zone CFM from the total system CFM to determine the bypass CFM. As an example with a total system CFM of 1200 and a smallest zone CFM of 700, the bypass needs to be 1200-700=500 CFM. 3. Install an electric bypass damper in the bypass duct from the supply plenum to the return air plenum.
3. In normal operation, the weight arm will lift up when pressure increases. If the air is flowing left to right, position the weighted arm at 4:00. If the air is flowing right to left, position the arm 8:00 when no zones are calling. 4. Adjust the weighted arm so that the damper is barely closed when all zones are calling.
Understanding Zone Controllers Braeburn zoning controllers serve as the brains of the zoning system. The zone controllers have a built-in computer to monitor the thermostats and the HVAC equipment, and to open and close the dampers. All equipment is connected to the zone panel. • The zone panel has connections to hook up thermostats. • The zone panel has connections to the HVAC equipment. • The zone panel has connections to power the zone dampers.
• All Priority allows the existing call to continue for 15 or 20 minutes, and then starts to switch over even if the first call is not done. The switchover starts with a purge, where the heating or cooling equipment is shut off, while the fan continues to run with the dampers left just like they were. With the equipment off, and the fan running, the conditioned air is “purged’ from the system until the air is nearly room temperature.
Understanding the Zone Controller Display All Braeburn Zone panels provide easy to read indicators to determine the state of the zone panel. By looking at the indicators, it is easy to determine the status of the dampers and equipment.
Braeburn 3-Zone Panel Indicators Function Color Thermostat 1,2 and 3 R Red Callout 1 Description Zone thermostats power monitor Thermostat 1,2 and 3 Y Yellow 1 Zone thermostats compressor call Thermostat 1,2 and 3 G Green 1 Zone thermostats fan call Thermostat 1,2 and 3 W White 1 Zone thermostats heating call Panel Power Green 2 Indicates 24VAC available to panel Equipment Rh Power Red 3 Indicates Power at equipment Rh terminal Equipment Rc Power Red 3 Indicates Power at equipme
SUPPLY TEMP HI TEMP LO TEMP PURGE DELAY RH Y1 HI/LOW LIMIT CUTOUT ADJUST W ▲ G J2-SHORT CYCLE PROTECTION C R 7 SA1 SA2 FLASHING WHEN NORMAL Y G NON HP NORMAL REV VALVE B FAN GAS OPP CALL 20 LOCKOUT NONE PRIORITY ALL G2 W/2-ZONES W C R Y G 5 HEAT PUMP DUAL FUEL O ELEC/HP 15 ACTIVE ZONE1 2-STAGES EMERGENCY HEAT ON OFF W Z1-PO COM Z1-PC Z2-PO COM Z2-PC 6 6 C PWR 24V COM 24C Z3-PC 13 DAMPER 3 Z3-PO Part No.
Configuring Zone Panels All Braeburn Zone Panels feature easy to configure DIP switches that eliminate concerns about configuration loss after a power failure. The installer can also tell at a glance that the panel is set up properly prior to leaving the job site. Which is faster for the installer? Go back through 25 menu steps verses one glance at the DIP switches to insure a panel is set up properly.
Braeburn 3 Zone Panel Configuration Switch Number Switch Label Switch Function 1 Non-HP / Heat Pump Conventional or heat pump control of W/Y 2 Normal / Dual Fuel HP 1st stage lockout on 2nd stage call 3 Rev Valve B / O O/B terminal active in heating (B) or cooling (O) 4 Fan Gas / Elec & HP Fan controlled by HVAC system or panel 5 Opp Call 20 / 15 Opposite call answer time in minutes 6 Lockout None / Active 2nd stage lockout without 2 zones calling 7 Priority All / Zone 1 Changeover pri
Additional Features for the 3-Zone Panels The Braeburn 3-Zone Panel has additional features to control staging by monitoring the temperature of the HVAC plenum. By using the Hi and Lo Temp cutout switches the installer can configure the panel to operate in the most economical mode. When the 3-zone panel is configured for a conventional system, the panel will upstage the heating equipment if the plenum temperature is 25 degrees less than the cutout.
2-Zone Panel Comfort Features • Allows for two separate thermostats to measure the hot and cold spots • Helps the heating and cooling system to direct energy to where it is needed • Functions automatically without the homeowner opening and closing vents • Prevents over-cooling the downstairs to keep the upstairs comfortable • Works in the spring, summer, winter, and fall 2-Zone Panel Economy Features • Saves almost $2000 to the contractor over installing two separate systems • Uses the homeowner energy dol
Braeburn Products Braeburn offers a wide variety of indoor control products. From our cost effective thermostat line to our innovative zoning products, we have a solution for residential and commercial applications. 866.268.5599 (Voice U.S. Toll-Free) 630.844.2543 (Fax Worldwide) +1.630.844.1968 (Voice Outside the U.S.) Visit our website at www.braeburnonline.com Braeburn Systems LLC • 2215 Cornell Avenue • Montgomery, IL 60538 ©2008 Braeburn Systems LLC • All Rights Reserved • No.
