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440 volt run capacitors
solradman
Member Posts: 58
Replaced a 377 volt run capacitor on a heat pump with a new one and system started up and runs fine. Got back to shop and parts guy called and said that he gave me a capacitor rated at 440 volts. Is there any problem running the 440v or should it be replaced with one rated at 377?
0
Comments
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370 vs 440vac cap:
As a general rule equipment designed for use of the 370 vac cap requires the use of same. In a bind for only a short time should the 440 be used. It packs more of a punch and can harm psc motors designed for 370 caps. If ya get a chance, read some on start caps used in refrigeration. These come in many sizes and you will get an idea of how and where they can be used. I know you have a run cap, but it's to shed some light as to why motors are rated for certain caps, be it compressors, psc motors, etc...
Mike T.0 -
cap vs. cap vs. vac
I'm going to twist things just a little.A given compressor will create or produce or make or generate only a certain amount of "double voltage which is additive stuff".0 -
not a problem
there is not a problem at all with using a 440volt capacitor in place of one that was rated at 370v.i stock only 440 volt capacitors on my truck,and still service units that i installed 440volt capacitors on fifteen years ago.the same way you can use a 600 volt fuse on all voltages up to and inlcuding 600 volts,you can use a 440 volt capacitor to replace capacitors that have a voltage rating of up to 440volts.0 -
right
The capacitance value (read in µF) needs to match the old one.
The voltage rating is a maximum limit for the cap, so using higher voltage cap is fine, but lower is not. Remember that an AC cap has to handle peak voltage and not just RMS.0 -
caps
We had a bad run of run caps on our geo units, they came supplied with 370V ones and were almost guaranteed to blow within 6 months. Then the manufacturer started supplying them with 440V ones and have had zero problems for about two years now.0
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