lennox furnace model G12D2E-82-8 issues - Page 2 - PeachParts Mercedes-Benz Forum

whunter · #16 02-06-2014, 10:48 PM

Quote:

Originally Posted by vstech

ugh... looks like two or more fields are burned out. does the dataplate have an RPM or HP rating?

HZ 60
AMPS 7.6
HP 1/5
RPM 1050

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kerry · #17 02-06-2014, 11:13 PM

When I had this problem I went to a local electric motor supplier who sold me an exact replacement.

whunter · #18 02-06-2014, 11:17 PM

Quote:

Originally Posted by kerry

When I had this problem I went to a local electric motor supplier who sold me an exact replacement.

First thing in the morning..

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pawoSD · #19 02-07-2014, 08:40 AM

Wow, you'd recoup the cost of a new high efficiency furnace in no time vs. that ancient thing. Its probably barely 60% efficient if its a normal draft-furnace. You're sending 40%+ of your bill out the exhaust every month.

I have a 72,000 btu rated 92% efficiency furnace and it heats approx. 2,800sq feet even in the -5 to -10F temps we've been having no problem....I'd say when its 5F out it runs about 25 mins of every hour over 2-3 cycles. Modern furnaces are MUCH better than ones that old. Don't fix it, dump it!

125,000btu would be WAY overkill. Or at least it should be....how big is the house? Usually a furnace that size would be in a house well over 3,000sq ft!

dynalow · #20 02-07-2014, 08:55 AM

Quote:

Originally Posted by pawoSD

Wow, you'd recoup the cost of a new high efficiency furnace in no time vs. that ancient thing. Its probably barely 60% efficient if its a normal draft-furnace. You're sending 40%+ of your bill out the exhaust every month.

I have a 72,000 btu rated 92% efficiency furnace and it heats approx. 2,800sq feet even in the -5 to -10F temps we've been having no problem....I'd say when its 5F out it runs about 25 mins of every hour over 2-3 cycles. Modern furnaces are MUCH better than ones that old. Don't fix it, dump it!125,000btu would be WAY overkill. Or at least it should be....how big is the house? Usually a furnace that size would be in a house well over 3,000sq ft!

Don't fix it, dump it!

x2 .....unless you have plans to get out of DEEtroit sometime soon

dynalow · #21 02-07-2014, 08:56 AM

Quote:

Originally Posted by pawoSD

Wow, you'd recoup the cost of a new high efficiency furnace in no time vs. that ancient thing. Its probably barely 60% efficient if its a normal draft-furnace. You're sending 40%+ of your bill out the exhaust every month.

I have a 72,000 btu rated 92% efficiency furnace and it heats approx. 2,800sq feet even in the -5 to -10F temps we've been having no problem....I'd say when its 5F out it runs about 25 mins of every hour over 2-3 cycles. Modern furnaces are MUCH better than ones that old. Don't fix it, dump it!
125,000btu would be WAY overkill. Or at least it should be....how big is the house? Usually a furnace that size would be in a house well over 3,000sq ft!

Don't fix it, dump it!

x2 .....unless you have plans to get out of DEEtroit sometime soon

pawoSD · #22 02-07-2014, 08:59 AM

Only cars are supposed to be money pits.

Don't turn the furnace into one too!

kerry · #23 02-07-2014, 10:36 AM

There are good reasons for keeping old furnaces. They're roughly the same reasons for keeping old Mercedes diesels. They're simple, reliable and easy for the DIY to work on. A repair on a new high efficiency furnace will probably require a $600 board versus a $90 motor or a $30 switch on an old furnace.

pawoSD · #24 02-07-2014, 11:00 AM

Quote:

Originally Posted by kerry

There are good reasons for keeping old furnaces. They're roughly the same reasons for keeping old Mercedes diesels. They're simple, reliable and easy for the DIY to work on. A repair on a new high efficiency furnace will probably require a $600 board versus a $90 motor or a $30 switch on an old furnace.

Incorrect. An old furnace is approximately 35% or more LESS efficient than a modern unit, and brings with it safety risks such as a cracked old heat exchanger. In a single cold winter, you could spend over $1000 more heating with an old piece of junk than with a new furnace depending on the size of house. My high efficiency unit is in its 5th season and all I've had to do is air filters and replaced a piece of plastic tubing that was leaking water. VS an old unit it has paid for itself twice over just in the fuel savings at this point. The control boards are not that unreliable, mine even has it right in the box with the burners and draft blower and its been just fine. Higher end furnaces put the electronics in their own closed compartment so they are even more protected.

DIY on the HE units isn't even that hard, just need to know a little more about basic electronics. They are no more sophisticated than the auto-klima boards on our old MB's. You can buy a decent brand new HE furnace for less than $1700 that will give 15+ years of service....its a no brainer.

whunter · #25 02-07-2014, 11:33 AM

$138.00 USD for a new blower motor.

Happy wife + warm house = priceless...

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kerry · #26 02-07-2014, 11:36 AM

I never wrote that newer furnaces weren't more efficient. I know they are. Your view depends on the assumption that the owner of the furnace pays the utility bills.

pawoSD · #27 02-07-2014, 11:52 AM

Quote:

Originally Posted by kerry

I never wrote that newer furnaces weren't more efficient. I know they are. Your view depends on the assumption that the owner of the furnace pays the utility bills.

If the furnace doesn't belong to the person using it and they don't pay the bills to run it then its kindof a moot point in that case. Rental properties are up to the owner to improve. However, the majority people do pay the bills for their equipment's operation, so being as efficient as possible is in their best interest, especially considering the long-term nature of things like furnaces and boilers.

Xlimodriver · #28 02-07-2014, 12:04 PM

Quote:

Originally Posted by pawoSD

Incorrect. An old furnace is approximately 35% or more LESS efficient than a modern unit, and brings with it safety risks such as a cracked old heat exchanger. In a single cold winter, you could spend over $1000 more heating with an old piece of junk than with a new furnace depending on the size of house. My high efficiency unit is in its 5th season and all I've had to do is air filters and replaced a piece of plastic tubing that was leaking water. VS an old unit it has paid for itself twice over just in the fuel savings at this point. The control boards are not that unreliable, mine even has it right in the box with the burners and draft blower and its been just fine. Higher end furnaces put the electronics in their own closed compartment so they are even more protected.

DIY on the HE units isn't even that hard, just need to know a little more about basic electronics. They are no more sophisticated than the auto-klima boards on our old MB's. You can buy a decent brand new HE furnace for less than $1700 that will give 15+ years of service....its a no brainer.

I agree! The first thing I did 10 years ago when I moved up here was install a high efficiency forced air and capped off the chimneys and installed a ventless natural gas fireplace after tearing out the rusted cast iron firebox in the downstairs wood burning fireplace. A 140 year old house is already equipped with enough cracks and to provide combustion air for the fireplace.
BTW, the fireplace insert is illegal in Ontario, I had to drive Watertown NY to buy it. I just hate sending hot air up and out a chimney.

whunter · #29 02-07-2014, 12:17 PM

Quote:

Originally Posted by pawoSD

Wow, you'd recoup the cost of a new high efficiency furnace in no time vs. that ancient thing. Its probably barely 60% efficient if its a normal draft-furnace. You're sending 40%+ of your bill out the exhaust every month.

I have a 72,000 btu rated 92% efficiency furnace and it heats approx. 2,800sq feet even in the -5 to -10F temps we've been having no problem....I'd say when its 5F out it runs about 25 mins of every hour over 2-3 cycles. Modern furnaces are MUCH better than ones that old. Don't fix it, dump it!

125,000btu would be WAY overkill. Or at least it should be....how big is the house? Usually a furnace that size would be in a house well over 3,000sq ft!

I have been looking for several years.

* This is an up-flow furnace.
* There are several high efficiency furnaces that will fit the seriously limited space.
* Most of the 1939 vintage ducting and the hood which are structurally built into the ceiling / walls should be replaced, because they have been inspected and refused by multiple cleaning companies.
* The attic has been over insulated = add several extra days to move and re-install the insulation.

.

barry12345 · #30 02-07-2014, 12:50 PM

If a common motor are any of the furnace service guys a customer or friend? They usually have good used spare parts for almost everything. Some just naturally hoard parts. See you already have something in common with them.

Sometimes even calling a service guy cold could get you what you want at a price you like. If the shaft is not latterly sloppy usually blower motors have a lot of time left in them. Time frame is many years usually.

Even out of my own stash of used furnace parts I replaced a motor, repaired a pump that I suspect got water in it by combining two. The pump was jammed and took out the start winding of the motor I think. The pump housing was different but I assumed rightly the internals where the same. The motor to pump coupling was on it's last legs as well.

To top it off one electrode insulator had become conductive probably from the furnace sitting around unused for several years. Contaminated moisture probably started the conductive path. Furnace has been chugging alone fine since the repair last fall.

I am using it as a temporary heat source on a project feeding it from a five gallon jugs. Thirty dollars today fills a jug and it depletes it fairly fast.

Alas we had a connection for .30 a litre or about 1.20 an American gallon diesel fuel. Unfortuantly the supplier of it died in a car crash last year. On a rollover on grass the roof collapsed and damaged his head.

Since I observed many American cars no longer have any strength in the roof structure I will not buy them. This was noticed some years back as I drive past a towing yard place almost daily. Just too many big three car roofs where partially or totally collapsed. General motors labels seemed the worse. Or perhaps it is just because of the big three they have more cars on the road. It was a smaller Pontiac car that got our supplier.

Also a service guy may be able to locate and tell you where a slightly used cheap high efficiency gas furnace may be. With all the housing coming down in Detroit. Detroit should be good for something.

I do not want it to sound like I am being tight. Years ago I just found it is not how many dollars you make instead it is how you spend them that makes the difference. I suspect the economy would suffer a serious setback if everyone did this as well.

The problem with this attitude is it became habitual. As the need decreased and disappeared I am still at it. I fix/repair/replace everything we own pretty well by these methods. I suspect you do much the same. I am also in a casual network where we exchange services and parts with people of similar charactaristics.

With your current pain and concerns I would probably take the fastest and easiest path for this one though. Then when better go find that furnace for 2-300 dollars or less.Two to three years old should be fine.

Since you are yet not feeling that good I an going to throw in a hopefully funny story about how cheap I am as a distraction. While getting my hair cut the barber asked me if I could locate double edged razor blades somewhere cheap as he could not. He said he would give me haircuts in exchange for them.

So we cut a deal. He suggested the almost free haircuts for them. I have to buy the blades. Another substantial supply of gillete double edged blades arrived from India this morning. Both in the deal are happy. Essentially both parties get what they want.

I think he is also reselling them. Whatever my haircuts are about three dollars each now. Meaningless in the grand scheme of life but cumulatively all of the various arrangements probably effectively double my income overall.