24 volt transformer - HVAC-Talk
2005年10月30日 · Even a 208v-24 transformer would only give you a 28.8v secondary if you applied 250v. In order to get 30+ volts you either have the wrong transformer, there is a slight short within the primary windings that actually parallell a …
Causes of a failed 24V transformer and contractor coils??? - HVAC …
2014年1月16日 · Twice this unit's has control transformer and heat strip contractor coils have burned out? The unit is a 3P 240 HP. There are a total of four units at this facility and this is the only one that is blowing the control transformer? The transformer is a 75VA. The thermostat is located around 30 feet away. The 24 volt circuit is fused correctly.
Fuse size to protect 24V transformer - HVAC-Talk
2012年6月19日 · A 40-VA 24-Volt would be rated; 40/24 is around 1.66-amps. If you could get a 1.5-amp fuse that would protect it. If the total load at one time was less than 1 amp, then you could use a 1-amp fuse. Be sure to fuse it on the 24-Volt side of the TR. You have to add-up all the loads that the 40VA 24-Volt would see at one time...
Grounding 24 volt transformer - HVAC-Talk
2020年6月17日 · In the United States, for example: The National Electrical Code® requires (section 250.20) grounding transformers for AC systems of less than 50 volts if the primary voltage exceeds 150 volts to ground or if the main transformer supplying power to the building is …
Grounding 24 volt transformer - Page 2 - HVAC-Talk
2020年7月5日 · The transformer comes with two posts, two conductors out of phase at +/- 24 VAC sixty cycles/ second; 60Hz if you prefer. There is no ground, there is no neutral, it's just two hot legs. L1 (red) and L2 (common). If you are having issues with grounded 24 VAC systems it is because you are grounding HOT and/ or COMMON.
240/24 volt transformer burnt 2 out testing - HVAC-Talk
2015年4月12日 · The 24 volt side has a 3A fuse. And did not pop fuse but burnt out 2 new transformers. ... 240/24 volt ...
Transformer primary side problems - HVAC-Talk
2017年3月31日 · The primary windings on transformer keep opening every few days. Transformer is on a heat pump split system. Transformer is wired correctly for 240. I measured 242 volts at the transformer. Unit will work perfectly for a few days and then everything will stop. Primary windings read OL and secondary (24 v) read resistance as they should.
Transformer on airhandler (Goodman) keeps burning out the
2013年1月2日 · Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R.
24 volt transformer - HVAC-Talk
2013年7月14日 · Read up about full wave and half wave rectification, that should help you understand why sometimes the transformer secondary is not grounded. Sometimes it is the installer being lazy Also note that if the primary voltage is above a certain voltage the National Electrical code at least in the USA requires that the secondary is grounded.
Low voltage confusion - HVAC-Talk
2021年9月25日 · Hopscotch is what Carrier calls it and Hopscotch is what Carrier taught us back in 73'. Usually low volt control circuits show the "common/neutral" wire on the right side of the schematic and that is where the one probe gets attached to and STAYS there The other probe HOPS from the "hot/24vac" side of the xformer ,then to the 24vac fuse ,then to the "inlet side"(R)of t'stat ,then to the "G or ...
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