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Author Topic: hooking thermostat to a oil fired furnace w/owb  (Read 4579 times)

pintopaul

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hooking thermostat to a oil fired furnace w/owb
« on: November 08, 2011, 06:17:54 PM »

first off thanks for this site . i really need help , ive read other posts and am still lost i mean im not stupid but somethings not clicking. first off let start from the beginning . i purchased a used owb it a wood master model 434 had it all hooked with power, water line and exchanger in a miller trailer furnace (not my choice came with the double wide)model number msha-086abfo-01 its a 1994 furnace. my question is how to hook another thermostat to the oil furnace so the blower will come on the outdoor wood boiler dealer sold me a honeywell r8285a1048 control center but this is for a 2 speed motor my furnace one has 1 speed i want the owb to be my main source of heat and the oil furnace as backup. I have pictures of the furnace, control center thats on the oil furnace and pictures of the wires on the control center thats on the boiler the old stat hooks to the side lettered t and theres 2 other wires on the same side marked (F) if you have other questions please text me at 518 335 3883 if you want pictures shot me you cell number and ill send them your way. This is my only heat source so i need to get this working soon Please Help thanks paul
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jackel440

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #1 on: November 08, 2011, 06:33:20 PM »

Man, I don't know how much help I can be ,but on my modular I have a coleman furnace.I yanked out my a/c coil to fit in my heat exchanger.SO no more A/C.I then just did some creative wiring in the furnace control panel.I am out of LP and the line is unhooked anyways So there is no going back to lp.
I just changed a few wires in my furnace so the power comes into the furnace.(using the wire already in the furnace)I still have the 24 volt transformer sending power to the thermostat.I then made it so when the stat calls for heat it trips the relay in the furnace like normal ,but now the relay just turns on my fan.TA DA! heat just like normal. :thumbup:Stat is just turning on the relay which sends power to the fan.
Doesn't get any simpler than that.I just unhooked and bypassed all the other wiring in the furnace.Don't use it or need it.
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jackel440

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #2 on: November 08, 2011, 06:49:53 PM »

Here is print of what I did to my furnace.I still had it taped up inside the door from last year.
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LPK-440 wood gasification furnace
New Holland LS170
24' Titan deckover gooseneck
96' Dodge Ram 2500 V10 4x4
Stihl 025
Stihl 038 Magnum
Stihl 041 AV

RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #3 on: November 08, 2011, 08:06:02 PM »

Does your existing thermostat have a fan position on it?
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Bull

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #4 on: November 09, 2011, 06:48:54 AM »

Pintopaul, on my owb I run the water circulating pump 24/7 and have wired my tstat for it to the furnace tstat 2 wires that go to the fan "ON" setting. I think this is the easiest way to do it.
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pintopaul

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #5 on: November 09, 2011, 01:31:49 PM »

i have a programable thermostat but theres only 2 wires going to the thermostat. bull you say you hooked it up to the blower this is where im lost my control has2) t letters and this is where the thermostat is hooked now for the furnace and then there 2) marked F where do i hook it? thanks paul please call my cell at 335 3883 or give me your cell and i'll send ya pictures of my set up
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RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #6 on: November 09, 2011, 01:40:11 PM »

How old is the oil furnace? Does it have a temperature switch in the plenum that turns the fan on?
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RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #7 on: November 09, 2011, 01:42:03 PM »

I just re-read your first post and see it is 1994.
Is there a circuit board in the furnace where the thermostat wires connect?
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pintopaul

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #8 on: November 09, 2011, 04:47:45 PM »

yes there is a fan switch and a limit switch its the little round style ,i believe its a circuit board depends what you call it . it has a reset switch if you have a cell i can send ya a picture of the whole set up. thanks paul
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jackel440

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #9 on: November 09, 2011, 04:55:56 PM »

He  is talking about the upper limit switch.It's resetable for when the furnace over heats.
There should be2 or three limit switches on it.I doubt there is any circuit boards in that older unit.
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LPK-440 wood gasification furnace
New Holland LS170
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RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #10 on: November 09, 2011, 05:04:48 PM »

send pics to 608-438-8300
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pintopaul

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #11 on: November 09, 2011, 05:27:48 PM »

pictures on there way thanks
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RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #12 on: November 09, 2011, 05:41:41 PM »



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It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. - Mark Twain

RSI

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #13 on: November 09, 2011, 05:46:50 PM »

Are the wires in the first picture the wires to the thermostat or the wires to the motor?
There should be a relay of some sort that controls the fan. Or there may be a switch somewhere that runs on line voltage. It would probably be adjustable for different temperatures (probably round silver circle with slide adjusters)
I would put a relay in parallel with that and have the new thermostat control the relay.
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It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. - Mark Twain

pintopaul

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Re: hooking thermostat to a oil fired furnace w/owb
« Reply #14 on: November 09, 2011, 06:01:48 PM »

ok first answer the 4 wire picture i sent the 2 wire on top go to the oil furnace thermostat marked (T) the second 2 hooked to (F) go to an eye in the burner. the fan switch on the plenum can not be set its a sealed unit. this does have a switch its a 3 position switch witch says on/off/fresh air i put it on fresh air but it makes the fan run all the time  witch my wife liked but i didnt because it was over 95 degrees in our house
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