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Electronics / Re: Thermostat wiring - Compressor runs?
« on: February 22, 2012, 06:04:42 PM »
Follow-up... I ended up using Relays and switches. I have a light switch to turn on/off constant power to the 3-way valve so I can have a spring/fall or day mode. In winter or night mode I have constant flow to the ductwork heat-exchanger. There are two sets of wires coming from the transformer to the valve(one is the thru the manual switch, the other goes thru the relay. In the spring/fall mode my first relay allows (With the switch off) the hot water only to flow the heat-exchanger in my ductwork when the relay (Normally closed) is tripped by the 2ndary t'stat. This will keep from heating the air when I am trying to cool and keep the convective heat from coming from the ducts with the heat off. I got to take the panel off my air-handler and see exactly what my heating and air guy did with the other relay to break the signal that feeds back thru the primary t'stat and allow the heatpump and a/c to work normally.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 19, 2011, 08:00:17 PM »
No, Not 120V. I metered the termnal block on the zone pump and found ~28v. Thought that would be close enough. Yes I want it to open when the fan runs.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 19, 2011, 06:58:32 AM »
I have a Taco 560 three way bypass valve. If I throw the manual lever it will open the valve partially to the heat exchanger. But does not open all the way and the flow to the waterheater is easier since the heatexchanger is overhead. I tried to steal power from my radiant floor pump but the valve stayed all the way closed. I'm going to get a transformer and see if that will work.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 18, 2011, 07:28:39 PM »
OK thanks! 
Now if I can get my bypass valve wired to bypass the heat exchanger. I have all the bugs worked out. I wanted it to open when I switch the t'stat to cooling. Any ideas on how to do that.
Now if I can get my bypass valve wired to bypass the heat exchanger. I have all the bugs worked out. I wanted it to open when I switch the t'stat to cooling. Any ideas on how to do that.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 18, 2011, 05:48:53 PM »
RSI, you say g has nothing to do with cooling. Then when cooling is called for the fan gets its signal from the the cooling wire? I've never messed with a t'stat much. So I don't know how all the signals work inside the HVAC unit. I realize the signals are just 24v circuit getting completed.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 17, 2011, 09:09:41 PM »
I see how taking both the wires off g on the old t'stat would work fine for heating. Fan gets its signal and you are NOT sending the signal to the old t'stat so the is no feedback. But what happens when you call for cooling? I think you would have to put the g wire back on the old t'stat.
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Electronics / Re: Thermostat wiring - Compressor runs?
« on: November 17, 2011, 05:34:27 PM »
Thanks for the replys.
I think I wired it like you guys said. I ran the r old to r new and the w new back to g old. However since the old has y and g common the compressor runs. Soooo... Tell me how to wire in the relay. Pleeeease
I think I wired it like you guys said. I ran the r old to r new and the w new back to g old. However since the old has y and g common the compressor runs. Soooo... Tell me how to wire in the relay. Pleeeease
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Electronics / Thermostat wiring - Compressor runs?
« on: November 16, 2011, 05:29:21 PM »
I have a Central Boiler. I'm using a second T'stat to control my fan in my HVAC (heatpump), but the primary t'stat has the compressor signal wire "Y" connected to the fan control wire "G". Is there a t'stat that I can use that does not connect the Y and G wires?
If the fan switch is "ON" on (the heatpump t'stat) the wires are not connected. So I have considered turning the fan switch to the on position on the HVAC t'stat and using the second t'stat to break the fan wire connection so the compressor would not come on unless the inside temp went too low. When cooling I would have to switch the fan to auto and bypass the second t'stat. Since I live in the South I'd like to be able is switch between cooling and heating easily. Less steps is better for the wife and kids. Anybody figured this out?
If the fan switch is "ON" on (the heatpump t'stat) the wires are not connected. So I have considered turning the fan switch to the on position on the HVAC t'stat and using the second t'stat to break the fan wire connection so the compressor would not come on unless the inside temp went too low. When cooling I would have to switch the fan to auto and bypass the second t'stat. Since I live in the South I'd like to be able is switch between cooling and heating easily. Less steps is better for the wife and kids. Anybody figured this out?
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