Original message
| chas036
 |  "Question about down sizing nozzel in furnace"
, posted Mon 21 May 21:18  
I just was given an almost brand new Carrier 58CMA 120 oil furnace with a Becket AFG burner that came with .75-70B nozzel rated at .85gph and rated at 120,000 btus input. This is the smallest size nozzel allowed for this particular furnace. My question is.... I only need a heat input of about 90,000 btus so I want to downsize the nozzel to .55-70B which is rated at .65 gph which will give me this lower heat input. The fuel pump is currently set for 130psi but this lower nozzel calls for 140psi setting. Will I have any problems if I put this smaller nozzel into a furnace that was designed for a bigger nozzel and a larger heat input? What adjustments do I need to make to do this? If I don't change the pump pressure will that affect anything?
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Replies:
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| doubleduece
| "Re(1):Question about down sizing nozzel in fu" , posted Mon 21 May 21:59
In order to get the proper btu rating from that nozzle you should check your oil pressure and change it if needed, put the smaller nozzle in first and then check your pressure before you make any changes if the pressure is to low,all that is happening is, that you are derating the nozzle You will also have to adjust the air damper on the burner to get the correct air/fuel mixture. Last thing to remember is your air delta T, you will probably have to change your fan speed to low. Good luck.
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| | Dog Biscuit
| "Re(2):Question about down sizing nozzel in fu" , posted Sun 3 Jun 02:07
Go to The Carrier Corp, either "Online" or by phone and get your answer.
To err is human to repair divine
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