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The Serial Number would really help in defining how old your Coleman furnace is. The model you have is used predominantly in manufactured housing. To find the Serial Number, you will need to remove the upper shroud of the furnace. There should be a sticker or plate on the back of that shroud of just inside the housing of the furnace, that will give you the Model # & Serial #. Armed with that, you can do a little detective work, as to it's age.
That doesnt work with these units they are manufactured gas specific. The manifold plate would need to be changed as well as notification to Noritz to have a new serial # issued. PC board reprogram required, etc. Buy a natural gas or LP model.
Your effeciency rating is 80%. Divide your output capacity 110,000 by your input capacity 137,000 and that will give you your effeciency.
The manufacture date is usually in the serial number.
You need to go to Luxaire.com and they can answer that question for you.
As far as parts there be parts available.
Fix or replace, if you are happy with the equipment and not really having a lot of problems, you may want to keep it. The newer equipment is more efficient, so if you think your gas bill is to high or you want to save some money on your gas bill, you may want to replace it.
Take your Model and serial number to an HVAC parts house and they will get a kit for you that switches over from propane to natural gas. The spring in the valve is different and the orifices are different. Propane runs about 10 to, 11 inches of water where natural gas is about 2.5 to three. So if you did not change the springs and orifices you will cause the furnace to over heat and posibly catch on fire. These kits are easy to change the orifices just unscrew. The top of the gas valve has cover over the spring and an ajustment screw inside just remove that and pull out old spring and insert new one. Be careful with the springs they are very tiny and not much thicker than human hair. You really need to get someone to set the pressure for you. Feedback welcome Rus
Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again
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