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Electronics / Re: Help with wiring a thermostat for OWB (Oil Furnace Fan Limit Switch)

« on: October 09, 2013, 04:17:41 PM »

Thank you both for the help I really appreciate it. I started doodling some ideas today and this is what I think may work pic below. Use a aquastat to control a 110vac relay ( blue). I would wire my current blower system (red) on the Normally Closed Side so when the a-stat had not met then the blower and all that will work as normal. When the A-stat makes then the relay will shift state sending power to the 24v relay (brown) that is controlled by my thermostat. when the heat is called the relay will close and send power to the blower. If the Fan Blower relay has enough heat so that it closes back feeding will not be a problem due to the relay. This look like it will work?? I have both the relays so that will not be a problem or expense.

Another question is how to wire up the 24v relay Im am using W1 as my first stage of heat so would it be W1 on one side and the common wire on the other from the t stat??

Thanks again

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Electronics / Help with wiring a thermostat for OWB (Oil Furnace Fan Limit Switch)

« on: October 08, 2013, 07:30:10 PM »

New to the board and a Newb at outdoor wood furnaces so please bare with me. I purchased a house about a year ago and after a 2k oil bill for the season my wife and I knew we had to do something other than oil. First off my house has two independent heating systems the heat pump (old portion) and the oil furnace (new portion) these units completely disconnected from each other. My plumbing is complete and pressure checked. I have 3 Circulations off my outdoor wood furnace (Mahoning 300)- 1 for my old portion (heat pump) with a 16x16 water to air heat exchanger and 1 for my new portion (oil furnace), and another for my domestic hot water heat exchanger. The circulations will run 24/7, to control my heat the thermostat will need to control the blower. This is where my problems start. I think I have the heat pump side figured out. Two thermostats the heat pump will be turned to fan and the second thermostat will break and make the green wire to turn on the blower thus hot air from the heat exchanger. My problem is the oil furnace side.

My oil furnace has 2 wires running to it red and white. From the way I understand it the thermostat turns on powering the burner. The fan only turns on when it hits the lower limit on the Fan Control Switch (Honeywell Blower limit switch) I think 100 on 150 off - 220 emergency shutdown. My heat exchanger is mounted 8-10 inches above the Fan Control Switch. In my mind with the heat exchanger at 160 the radiant heat may complete the circuit through the Fan Control Switch blowing air all the time. Im having trouble wiring my 24v thermostat to turn on my blower, I have a 24vac Allen Bradley Relay to switch the 110 Vac power, without back feeding my Fan Control Switch. I think if it back feeds it will double feed and kill my blower motor.

Any Ideas?? I can post pics and such if it would help. Your help is greatly appreciated.