Fuel Oil News

Fuel Oil News - January 2017

The home heating oil industry has a long and proud history, and Fuel Oil News has been there supporting it since 1935. It is an industry that has faced many challenges during that time. In its 77th year, Fuel Oil News is doing more than just holding

Issue link: https://read.dmtmag.com/i/766095

Contents of this Issue


Page 44 of 51

www.fueloilnews.com | FUEL OIL NEWS | JANUARY 2017 45 may require a licensed electrician. Let's look at an example of 24 Vac zoning. Again the low-voltage transformer, Figure 4, acts as the primary power generator for zoning with dampers and zone valves. It's true that the zoning panels used today, Figure 5, are so much easier during the initial install and in my opinion on that basis only are worth the additional costs. Servicing is also simplified since each circuit can be readily checked at the board for power in and power out. With today's boards you can also easily mix line voltage with low voltage to accomplish amazing things like Primary-Secondary pumping with an indirect and low voltage zone valves and why I went with such a panel in my own home. When wiring "old school" I've found that a simple little device called a "barrier wiring strip" Figure 6. These can really simplify the wiring and make it easy to troubleshoot too. In Figure 7 we show the wiring for three wire zone valves, Figure 8, using the wiring strip and in Figure 9 for four wire zone valves, Figure 10. Finally, we should go over how to properly size a 24 Vac trans- former. With the popularity of multi-zone systems and the use of low-voltage zone valves come problems with knowledge of amperage, or "those little amps have got ya again". So, the problem can be fixed with just a little knowledge. The problem? How do you size a transformer for a multi-zone system using zone valves? There are three things you need to know Figure 4 and the first two are pretty simple: the primary voltage, normally 120 volts, the secondary voltage, normally 24 volts, and the volt-ampere output (VA). So how do you find VA or Volt Amperes? There's only one right way, by using this formula: unknown VA = required VA x E

Articles in this issue

Links on this page

Archives of this issue

view archives of Fuel Oil News - Fuel Oil News - January 2017