2007-09-04 15:03:10 · 10 answers · asked by ordie b 1 in Home & Garden ➔ Maintenance & Repairs
actually that is quite normal for you to have 250 volts...if your fan motors are burning out there is some other problem other than the voltage...most motors are rated 208-230 volts and that can be plus or minus ten percent or about 20 to 23 volts ...most time if your unit is burning out a lot of fan motors then there is not enough back pressure on the blower and it is blowing to much air...or someone put a larger fan on the outside unit..
2007-09-04 15:11:05 · answer #1 · answered by Anonymous · 7⤊ 1⤋
The normal permissible operating range at which an A/C component (208-230 volt) will operate satisfactorily is between 187 and 253 volts. It is far more likely to burn out a motor due to low voltage than due to high voltage. I would be inclined to check the system for some kind of blockage that is impeding airflow through the system and raising static pressure. Have your technician check the amp draw on the blower motor with the blower door on and see if the amps exceed the designed running load amps.
2007-09-05 01:51:37 · answer #2 · answered by Just wonderin' 5 · 1⤊ 0⤋
Make sure that the motors are rated for 230v not 208v. There is a big difference.
A 208v motor can run at +/- 10% of the nominal voltage. In this case between 188.8v - 228.8v.
For a 230 motor, the range would be 207v - 253v.
Also (If you can) check to see that the drop from the utility is not coroded that would cause resistance and higher voltage
2007-09-04 22:55:11 · answer #3 · answered by ric_ozz 3 · 0⤊ 0⤋
You are lucky. The nominal voltage for residential service is 240 volts, not 220. 230 volt motors run just fine on 250. They don't like low voltage. Have a HVAC mechanic look at the fan motors. There is some other problem happening.
2007-09-06 00:47:30 · answer #4 · answered by John himself 6 · 0⤊ 1⤋
Call the utility company, the transformer that feeds your house is going bad.
It is NOT normal for your voltage to be that high. It could be a broken neutral as someone else said. It could also be extreme heat from weather affecting the transformer and will correct itself when the temperature drops a little.
Edit:
208 and 240 are two different systems.
208 wye and 240 delta.
Very seldom would a house have 208.
And as far as 10%, NO. 3% on a feeder and 3% on a branch circuit max. I know that's for voltage drop, but over 5% increase is considered a spike. Componants that are rated 250 volts means max. So if your running at 250 then you are maxed and 1 more little volt and you are over the NEC rating of that componant. When you are over the rating, voltage can jump gaps between terminals, and burn through isulation on motor windings.
Insulation on motor windings is just a coating of polyurithane, and it don't take much to burn that out.
BE VERY CAREFUL taking advice on electricity, and gas plumbing on this cite.
Even I cannot tell exactly what's going on there without being there to test things.
250 is too high for a delta system, or any low voltage system.
And a high voltage system starts at 440 volts, but 480 is more popular.
2007-09-04 22:10:50 · answer #5 · answered by awake 4 · 2⤊ 5⤋
You dont get 220 volts its 240 volts buit thats a plus or minus 10% that wont burn out your motor.
2007-09-05 00:01:34 · answer #6 · answered by Stephen P 4 · 3⤊ 0⤋
Are you using a dual voltage motor? If you are make sure it is wired for high voltage not low. It will say on the motor plate high voltage, low voltage with numbers that go to corresponding terminals. Did you replace the run cap? Is motor turning proper direction? If it is has low speed medium speed and high speed make sure it's wired properly. The incoming voltage is within the tolerance of a properly wired motor. Make sure it's wired properly. Sounds to me like improper wiring on the motor. Good Luck
2007-09-04 22:28:20 · answer #7 · answered by alan s 2 · 2⤊ 3⤋
actually, the voltage should be 240 volts. not 220. you SHOULD be ok. you could check with the elecytic co anyhow.
2007-09-08 10:33:56 · answer #8 · answered by oldtimer 5 · 0⤊ 0⤋
Check both legs to ground to make sure one is not higher than the other. Sometimes a load can become unbalanced due to a breakdown in the neutral wire causing the load to shift on one leg which will make it higher at different times.To check wire integrity you will need a mega ohm meter. Call an electrician when dealing with main power problems unless your experienced. Be Careful.
2007-09-04 22:14:47 · answer #9 · answered by candyman 4 · 1⤊ 3⤋
If you're in the U.S. your 'standard` voltages
are: 208V. (Cities), and 240V. (suburban & rural).
250V. is not your problem, (<5% over Std.).
Most A.C. Units are designed for 240V.
Motors are designed to run on a fairly wide
range of voltages.
Look for some other problem with the A.C. installation.
Is the air cooling of the motor compromised?
2007-09-05 10:07:45 · answer #10 · answered by Irv S 7 · 1⤊ 2⤋