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Rick Mather
Rick Mather, HVAC Technician
Category: HVAC
Satisfied Customers: 3634
Experience:  35 years experience, HVAC
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I have a older Fuel oil Furance it is a Lennox (OF7-140M)

Customer Question

I have a older Fuel oil Furance it is a Lennox (OF7-140M) It is 112,000btus The Burner is model OHP31c-7. What am looking for is the proper nozzle that I should be using right now Im using a (.75/70deg-A). Could someone tell me if this is the right nozzle??
Submitted: 6 years ago.
Category: HVAC
Expert:  Rick Mather replied 6 years ago.
The nozzle sounds a bit small because it looks like the furnace is 140,000 btu which be at 1.00 gpm nozzle so under firing it will not hurt it and you will use less oil this way. As far as the degree angle that would be listed in manual and or rating plate located in burner compartment.

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