![]() I include the yellow wire and the heat pump outside turns on (I hope I'm saying this right). great I have air coming out of the vents. I hookup the red wire with the green and my fan turns out. I replaced the fuse and I'm getting 24v at the thermostat on the red wire. It ended up being a tiny fuse that I blew when I crossed the wires. ![]() I bought a new one and it didn't fix the problem. The HVAC guy said I blew the transformer. wire size can become an issue on large buildings.Click to expand.I was trying to change out the thermostat and I crossed the blue and red wires. With so many manufacturers of zone is as Carol Fey says.you need to calculate the VA. Personally, i think the transformers with a circuit breaker is a real good deal.as another solution to how many zones may open at one time ,roll the dice strategy.ĭave, i think the reason is that your transformers dont have enough MoJo.if they did they would work properly with no hesitation. I wanted to find the eviron com connection to the module for our building management system.which unfortunately is not a Honeywell BMS. The thermostats can have floor sensors lashed up to the little more fancy thermostat that is offered.(AQ1000TN2) a,f, af. Give me a few mins and i see if i can find it.BRB I think i have a post by Honeywell with a link. the AQ 1000TN2 2 wire polarity insensitive communication thermostats.these have module approach. For some mysterious reason, when the load is inductive, the measurement is called VA, and when the load is resistive, the measurement is called watts.ĪQ251 has reset ,AQ250 can be expanded with AQ255 orĪQ257 fof zones or is expandable to 16 zones. It also happens to be exactly the same as watts. The valves are pulling "VA" from the transformer. The situation you're describing where some work and some don't is a new one for me. The valves should be perfectly OK except that they can't get the power they need. The usual result is that the winding burns, and there just isn't any power available to operate any valves anymore. When a transformer is overloaded, the damage happens to the secondary side of the transformer. But if your situation gives you just one set of wires from all of the transformers, yes you can connect a couple transformers together. And of course 40VA trasnformers are easier to find and cheaper than the big ones. One good reason for not connecting the transformers is that if one burns out, the other isn't affected-the users still have heat. 32A zone valves on one 40 VA transformer and five on another. And there's no need to connect the transformers to each other. The cool thing about this situation is that the zone valves don't all have to go on the same transformer. Is it possible to connect 2 of them in parallel in order to get the required VA? Now, I had some difficultly finding a 100VA xformer. As the xformer becomes over loaded, what happens to the valves? Do some of them remain open and others not? Or do they all begin to loose the ability to stay open? Will each valve see a drop in voltage as more call, or is it a drop in amps? Can this burn out the motors as well as the xformer? Last night I have the people turn off all the stats except only the ones they needed, and the heat did work in those zones. I am sure that as more and more of the stats called for heat, less and less power was available for each valve. They have always had trouble with some zones not working sometimes, and then they seem to just start working again. It has slowly melted down over the years. ![]() As these were Honeywell zone valves, I decided that I needed at least a 100VA xformer to drive them all when they are all open at the same time. Each zone valve is switched with a t-stat in the room. The wires simple run through out the building, connecting to all the zone valves in a parallel circuit. So, what I have in the boiler room is a pair of wires hooked to a xformer.
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