![]() ![]() This started as you saying it (a separate transformer at the thermostat) wouldn’t work to no comment of whether it would work but the possibility of a fringe back feed safety scenario when power is disconnected to the furnace. You have a vague incomplete understanding at a block diagram level. I understand what is happening at a components and circuit level. In any event, not understanding something well enough to articulate the fault mechanism is simply timeless. As to your “so called experience” WiFi thermostats have only been around for about 5 or so years so your first 30 years of experience is irrelevant. You are singlehandedly capable of moving the term “Tradesman” back to the stone ages. So both the furnace and transformer get connected to 'R'? If I come off as arrogant to you, well, then call me a cranky old timer, so be it. let's just say since before programmable thermostats were offered. I have been installing thermostats for longer than I care to admit. Your problem is you have no idea what you're looking at or how to explain it. You can see (or maybe not) that the secondary transformer and the furnace never come in to contact with one another: Here's a pretty simple diagram that shows how it's done - properly - with an isolation relay. you cannot double up transformers under one terminal. The primary becomes energized, and so does anything it's conected to. 24 VAC from the thermostat transformer is powering the secondary side of the control transformer. You open your control box and start poking around and WHAM - you get nailed. Imagine for a moment that you are working on the furnace and turn off the power, but you leave power to the secondary transformer on so as not to lose your programming. As you can see (or maybe not) it does not isolate R via a relay and can result in a feedback to the furnace control when there is no call for heat. The diagram you found is NOT the proper way to install a secondary transformer. Hopefully this clarifies how to wire one of our transformers.You have successfully contradicted yourself, confused the reader, and offered damaging advice. Similarly, any two phases on the wye configuration should be connected to the gray and black wires on the transformer for a 480 Vac primary. It doesn’t matter which phase goes to which wire.įor the above wye configuration, you would connect your neutral (GRAY) and any phase to the black and brown wires on the transformer for a 277 Vac primary. If you wanted to use 240 Vac on the primary, you would take any two of the three phases and connect them to the orange and black wires on the transformer. Then you would either connect phase A or C (BLACK or BLUE) to the 120 Vac tap on the transformer (Wht). If you wanted to connect 120 Vac to the primary, you would connect your neutral (WHITE) to the transformer Comm (Blk). Let’s say you want to connect the above delta configuration to our TR50VA015. Take a look at the wiring diagram for our TR50VA015: It’s that easy!įor the sake of clarity let’s do some examples. ![]() Then separately insulate each of the unused wires. Once you know which two wires have the voltage for the tap you want, simply connect one power wire to the wire on our transformer with the voltage tap you want, and the other power wire to the wire on our transformer labeled “Comm”. If you don’t know which wire is which, you can always measure it using your multimeter. Knowing which voltage is between which two wires is key when installing one of our multi-tap transformers. Usually, between neutral and a phase is a smaller voltage, and between two different phases is a larger voltage. This allows each configuration to provide two to three different voltages. The main point to get from this is that your incoming power typically has three phases and one neutral. Please note that not every delta or wye set up will have these voltages, these are just two examples. The wye configuration also looks a bit like a flux capacitor from Back to the Future if that helps. Delta ConfigurationĪn easy way to remember this is that the delta configuration looks like a delta symbol, and the wye configuration looks like the letter “Y”. Typically, they’re in either a delta or wye configuration. Luckily, the solution is an easy one to remember once you know it.Ī large part of being able to figure this out is knowing how your 3-phase incoming power is set up. This is understandable, considering all the wires involved. Occasionally we get calls from customers asking which wires to connect to our multi-tap transformers.
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