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1

General Outdoor Furnace Discussion / melting roof ice

« on: November 02, 2011, 08:05:41 PM »

Anybody ever tried running small diameter tubing on the eaves to melt off ice build up? My house has terrible ice build up in the winter and I was wondering if you could run a loop of say, 1/4" tubing along the edges of the roof like they do with the electrical ones you can buy and run the hot water from the return thru it to melt the ice ?

2

Electronics / Re: Blower wiring

« on: October 19, 2011, 08:15:08 PM »

Thanks for all the replies. I dont have central air installed on my furnace and dont plan to, at least not right away. I did a test rig using just thermostat wire and got it to work by connecting a red (hot wire) to the red on the furnace and ran it out to the 3 way valve, which I call a zone valve that is a 24 volt valve. then i continued that out to the thermostat, which down in my crawl space consisted of a short piece of T-stat wire that I could touch together and complete same as a thermostat would.  The white wire I ran to the G teminal , which would be the terminal for the AC blower. I ran a single wire from the other wire on the zone valve to the C wire on the board which I believe is a common ground and when i touched the two ( Red and White from my mock Tstat) together, the Zone valve actuated and the blower turned on and ran. This solves my immediate problem. What im worried about is if the fire goes out on the wood boiler and my furnace fires up what is going to happen when the fan limit trips? Smoke?  Somebody must have gone through this by now. I just want to foolproof it.

3

Electronics / Re: Blower wiring

« on: October 17, 2011, 08:53:29 PM »

Ok, I had a look at the furnace and it looks pretty complex in there where the fan unit is. There is a circuit board with about 50 wires plugged into it  and i would have no idea at all where to connect to it. I installed the furnace back in 2002 and all I had to do was connect the two wires from my existing thermostat to the screw terminals on the circuit board. There are other terminals, most likely for air conditioning, which may be the solution to my problem, as if I understand it correctly, you have a similar installation with a coil (Heat/Cooling exchanger) For central A.C. So something has to trigger the blower fan to run for the A.C. So can i just connect the 24 volts going to my 3 way zone valve to the terminals on the circuit board that would normally be used for cooling? If that is the case, Which terminals would be used and how would it be wired? I have no problem with using 2 T stats, I just am stumped as to how to wire it into the furnace. I did figure out how to speed up the blower for the heating coil, (just have to switch two wires)  I see where one is labeled heat and one is for cooling. This is the only thing I am having a problem figuring out. the rest has been pretty straight forward.  Can I steal power from the existing thermostat to power my second T-Stat?  Lots of questions.

4

Electronics / Blower wiring

« on: October 17, 2011, 05:41:04 PM »

Hello all. I`m new to the board and am currently in the process of hooking up my woodmaster 434 boiler. So far I have the pex buried and hooked up to my existing nat gas forced air furnace with a 16 x 18  heat exchanger coil, 3 way valve with an auxillary switch rated at 15 amps 120 Volts that I assume is to be used to control the blower fan. My question is how do I connect it so that my gas furnace will come on in the event the fire goes out in the 434 without frying everything. any help will be appreciated.