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Old 08-18-2010, 05:09 PM   #46
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Furnace Not Blowing Hard


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Originally Posted by yuri View Post
Wait until we get a discussion on how to determine the rotation of a oil burner pump and describe it.
ROFL...

The worst and best thing they did with oil burner pumps. Is make them by rotational.

Love that black smoke that comes out of the chimney when someone doesn't check and correct the motor rotation when they swap a burner motor out.

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Old 08-19-2010, 01:02 AM   #47
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Furnace Not Blowing Hard


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Originally Posted by beenthere View Post
ROFL...

The worst and best thing they did with oil burner pumps. Is make them by rotational.

Love that black smoke that comes out of the chimney when someone doesn't check and correct the motor rotation when they swap a burner motor out.
I have ran into like that more than once with few service calls some motor you can not able change rotation by electrically so have to swap to diffrent motor to slove the issue { just don't start with dammed DC motors they are it own world with it !!! }

Twice I have to change the FO pump due it was wrong rotation due they stated no fuel start.

Merci.
Marc

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Old 08-19-2010, 08:24 PM   #48
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Furnace Not Blowing Hard


Foiled again! I just re-checked the blower and it is indeed running counter-clockwise as it should. There must be something else causing the meager air flow. Back to the drawing board for me.
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Old 08-19-2010, 08:43 PM   #49
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Furnace Not Blowing Hard


Measure the diameter of the pulley on the motor. Should be at least 3.75" or perhaps a 4". You need to increase its size from the basic 3.25" to overcome the resistance of the new AC coil. That furnace is a fuel guzzler and a new one would pay for it self quickly. You may need new bearings when the fan is speeded up. At 28 or more years old and with that rusty shaft it may need a new blower wheel and be difficult to take apart and expensive to repair. You should have at least a 1/3 hp and possibly a 1/2 hp motor to be able to use larger pulleys and speed it up.

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Last edited by yuri; 08-19-2010 at 08:52 PM.
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