Copyright © 2005 Heathkit Company, Inc. All Rights Reserved Automating and Integrating Residential Systems Presentation 9 – In-Vent Dampers and Boosters

2 Objectives At the end of this exercise, you will be able to:

3 Describe the function and purpose of a damper. Describe the function and purpose of a booster fan. Explain the difference between a normally- open damper and a normally closed damper.

4 Properly connect a damper and have it operate automatically. Properly connect a booster and have it operate automatically.

5 About This Presentation In a forced air furnace system, sometimes the furnace’s blower is not powerful enough to move the air that is required to heat, cool, or ventilate a home. Therefore, we will look at in-vent boosters. Sometimes we will want to close off rooms or areas of a home from the furnace. So, we will also look at in-vent dampers and other items.

6 In-vent Dampers Dictionary – A valve or plate (as in the flue of a furnace) for regulating the draft. But dampers are also used in furnace ductwork.

7 Dampers can be purchased as “normally open” or “normally closed.” “normally open” “normally closed”

8 A damper typically operates from power received from a 24-volt AC transformer.

9 Pressure Bypass Damper – It protects your furnace blower from over-pressure buildup. Courtesy of SmartHome

10 Booster Fan Typically used to assist the furnace blower to move air to a remote portion of the home.

11 You can use the DuctStat to control the inline duct fan. Courtesy of SmartHome

12 df Courtesy of SmartHome Room-to- Room Fan Lets you easily move air from one room to another.

13 This fan just sits over your floor register. Courtesy of SmartHome

14 Doorway Booster Fan Moves air from one room to another. Courtesy of SmartHome

15 Power Register It automatically opens and closes. Courtesy of SmartHome

16 Systems and Zones What is the difference between a system and a zone? This knowledge can keep costly mistakes from happening.

17 SYSTEM -- An HVAC furnace and air conditioner installed in a house can be called a system.

18 SPLIT System -- A two-story home with an HVAC system installed for each floor would be called a split system.

19 Zones are different than systems. Multiple thermostats make comfort levels throughout a house more consistent and easier to maintain.

20 Cost of Running HVAC HVAC will typically use the most power and energy in a home.

21 Thermostats Thermostats originally had one function.

22 Today’s thermostats, however, have smartened up a lot. They control both the furnace and the air conditioner. They can be manually adjusted. They can adjust the temperature based on the time of day or day of the week. They can be controlled by a computer or other automation device.

23 But sometimes even a smart thermostat will need help. This can be done by using an RS-422, X10, or other appropriate protocol.

24 Automation Controllers Some automation controllers have built in astronomical settings. These controllers can be set by entering either the zip code/ postal code, or the latitude/longitude.

Copyright © 2005 Heathkit Company, Inc. All Rights Reserved Automating and Integrating Residential Systems End