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

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46 JANUARY 2017 | FUEL OIL NEWS | www.fueloilnews.com or in simple language: transformer VA = required VA x applied voltage (24 VAC) Okay, so how about a working exam- ple. Let's say that you have five Honeywell V8043A zone valves, Figure 8). Each of these zone valves requires .32 amps of power. So your required power is .32 amps. .32 amps times 5 equals 1.6 amps. Now you multiply that by the voltage, 24 volts. 1.6 times 24, which equals 38.4 VA. Looks like you need a 40 VA transformer and let's try another one. This time it's 5 of the older Taco 'heat motor' zone valves at .9 amps each, Figure 9). .9 amps times 5 equals 4.5 amps; 4.5 amps times 24 volts equals 108 VA. In this case you need a 100 VA transformer. Are things starting to fall into place? Some manufacturers have their own way of com- puting necessary VA, but I've always gone with this formula and had zone valves last up to 40 years and that five zone example was in my last home. One powerhead in 40 years isn't bad. By the way, as far as what last longer, try one powerhead against three circulators on the same job in 40 years. I love zone valves! See ya. l F O N George Lanthier is the owner of Firedragon Academy, a 25-year-old Massachusetts Certified School teaching both gas and oil and other heating subjects. Firedragon Academy has its hands-on training facil- ity in Sturbridge, Massachusetts at the Beckett Training Center. Firedragon is also a publishing firm publishing George's over 60 books and manuals on HVAC subjects. He is a CETP, NATE, NORA, PMAA and PMEF Proctor and has been a Massachusetts Certified Instructor since 1975. He can be reached at 608 Moose Hill Road, Leicester, MA 01524. His phone is 508-421-3490 and his website can be found at FiredragonEnt.com Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

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