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naelec 01-01-2013 11:16 AM

Lennox blower drawing too much current on starting
Good morning and Happy new year to everybody....
My problem is the following : i have a Lennox elite serie 2003 oil furnace (a big one 140000btu,I think) which is causing me headaches:
After 1 and half year use ,the relays under the control board started to desolder in the blower fan circuit .The fan was set at high speed because the house is big...
After resoldering them correctly the blower works fine till now.....
Same thing,relays need to be resolder but also the wires which plugs for the blower fan get burned....
After fixing this,i get the following result : difficulty to start the blower (take like 6 or 7 seconds to reach its speed). During this,high starting current of course !! After it starts,current is 6,4A. I check the capacitor it seems alright and test around 6 microfarads.
Is this value OK. For now i set the fan continuously ON operation and medium speed....
I am vrey anxious about this because we have very cold weather at this time.
Unhappily i cannot find a model or serial number. The motor fan is direct drive but also i cannot read the nameplate.
Assistance would be greatly appreciate.Thanks in advance

Tator1076 01-01-2013 11:24 AM

Check starting rotor amps. If its over 10 or higher amps motor winding are going.

carmon 01-01-2013 09:58 PM

what is a starting rotor amp......:(

Marty S. 01-02-2013 06:15 AM

What's the rating printed on that capacitor? Six isn't sounding right for a 3/4 or 1 HP motor.

carmon 01-02-2013 07:27 AM

the motor should also have what capacitor is required stamped on it as well......:no:

naelec 01-02-2013 09:36 AM

Thanks to everybody who answered me....The value on the capacitor is erased and nothing written on the motor...
The lennox oil furnace is elite and model 023Q5-140/154R-5A
I dont have any contact at Lennox, so if somebody could tell me the right value of the capacitor and the motor,or who to call at lennox or a way to obtain this informations, or a internet website lennox parts,etc, would be very helpfull
Huge thanks

carmon 01-02-2013 07:00 PM

6 microfarads is not a common capacitor here...... what is the motors h.p.

mrairflow 01-03-2013 05:12 AM

the cap needed is stamped on the tag on the motor probably a 15 or 20 as lennox uses big caps on blwers

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