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HVAC run and start capacitors Kettering 01-27-2008
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Posted by Noon-Air on January 27, 2008, 1:04 pm

> Which HVAC capacitors are most likely to fail? (run caps, starting
> caps or does it matter)

Plastic ones

> If there a brand that's better then the rest?. It appears they all
> come from Mexico or China. I can't seem to find Mallory or GE any
> more.

Very astute observation

> If a dual 440V cap is rated as 60+10 is either a 55+10 or 60+7.5 an
> acceptable substitute long term?

No

> TIA

YW

Now call you local *COMPETENT*, licensed, insured, professionally trained,
HVAC tech that will probably have the exact OEM replacement part on the
truck. While he is there, have him clean and service the system. Then pay
the man.



Posted by Bobb on January 27, 2008, 3:39 pm
If you're trying to decide what capacitors to stock, a lot depends on the
equipment you normally service. As for brand, go with what your supply house
sells.



I'm not sure if this applies to start capacitors also, so these comments are
about run capacitors.



The 10% +/- formula will get you through in a pinch, but it's not a good
idea to make a habit of it, and you should always try to get back with the
right capacitor ASAP.



If you have the physical room, you're better off combining different
capacitors. You can combine a multitude of single duty and dual capacitors
to achieve different ratings. It may not look great, but it'll get the job
done. Just be sure to secure them properly.



If you wire two capacitors in parallel, the mfd rating becomes the total of
the two mfd ratings. The voltage rating will be equal to the lowest voltage
rating on either capacitor. e.g.: a 35mfd/370v plus a 10mfd/440v is equal to
a 45mfd/370v.



If you replace a three terminal dual 35mfd/10mfd/370v capacitor, you can use
a three terminal 35mfd/5mfd/370v and a separate 5mfd/370v, two terminal
capacitor. Put a jumper wire from the 5mfd capacitor's "C" terminal to the
"C" terminal on the three terminal capacitor, and another jumper from the
other terminal of the 5mfd capacitor to the terminal marked "Fan" on the
three terminal capacitor. You can also use a two terminal 35mfd/370v
capacitor and a separate two terminal 10mfd/370v capacitor. Either one of
these combinations will get the job done.



You can make a lot of combo's this way.


> Which HVAC capacitors are most likely to fail? (run caps, starting
> caps or does it matter)
>
> If there a brand that's better then the rest?. It appears they all
> come from Mexico or China. I can't seem to find Mallory or GE any
> more.
>
> If a dual 440V cap is rated as 60+10 is either a 55+10 or 60+7.5 an
> acceptable substitute long term?
>
> TIA




Posted by kettering on January 27, 2008, 4:21 pm
There's also the Amrad Turbo200 field configurable cap.

http://www.americanradionic.com/content/view/31/61/

I just wonder if they're a reliable cap?

wrote:

>If you're trying to decide what capacitors to stock, a lot depends on the
>equipment you normally service. As for brand, go with what your supply house
>sells.
>
>
>
>I'm not sure if this applies to start capacitors also, so these comments are
>about run capacitors.
>
>
>
>The 10% +/- formula will get you through in a pinch, but it's not a good
>idea to make a habit of it, and you should always try to get back with the
>right capacitor ASAP.
>
>
>
>If you have the physical room, you're better off combining different
>capacitors. You can combine a multitude of single duty and dual capacitors
>to achieve different ratings. It may not look great, but it'll get the job
>done. Just be sure to secure them properly.
>
>
>
>If you wire two capacitors in parallel, the mfd rating becomes the total of
>the two mfd ratings. The voltage rating will be equal to the lowest voltage
>rating on either capacitor. e.g.: a 35mfd/370v plus a 10mfd/440v is equal to
>a 45mfd/370v.
>
>
>
>If you replace a three terminal dual 35mfd/10mfd/370v capacitor, you can use
>a three terminal 35mfd/5mfd/370v and a separate 5mfd/370v, two terminal
>capacitor. Put a jumper wire from the 5mfd capacitor's "C" terminal to the
>"C" terminal on the three terminal capacitor, and another jumper from the
>other terminal of the 5mfd capacitor to the terminal marked "Fan" on the
>three terminal capacitor. You can also use a two terminal 35mfd/370v
>capacitor and a separate two terminal 10mfd/370v capacitor. Either one of
>these combinations will get the job done.
>
>
>
>You can make a lot of combo's this way.
>
>
>> Which HVAC capacitors are most likely to fail? (run caps, starting
>> caps or does it matter)
>>
>> If there a brand that's better then the rest?. It appears they all
>> come from Mexico or China. I can't seem to find Mallory or GE any
>> more.
>>
>> If a dual 440V cap is rated as 60+10 is either a 55+10 or 60+7.5 an
>> acceptable substitute long term?
>>
>> TIA
>
>


Posted by Bobb on January 27, 2008, 4:58 pm
Don't know. My supply house has them, but I have no experience with them.
They looked a little bulky and pricy, and I already stocked up to 45mfd and
several duals.

> There's also the Amrad Turbo200 field configurable cap.
>
> http://www.americanradionic.com/content/view/31/61/
>
> I just wonder if they're a reliable cap?
>
> wrote:
>
>>If you're trying to decide what capacitors to stock, a lot depends on the
>>equipment you normally service. As for brand, go with what your supply
>>house
>>sells.
>>
>>
>>
>>I'm not sure if this applies to start capacitors also, so these comments
>>are
>>about run capacitors.
>>
>>
>>
>>The 10% +/- formula will get you through in a pinch, but it's not a good
>>idea to make a habit of it, and you should always try to get back with the
>>right capacitor ASAP.
>>
>>
>>
>>If you have the physical room, you're better off combining different
>>capacitors. You can combine a multitude of single duty and dual capacitors
>>to achieve different ratings. It may not look great, but it'll get the job
>>done. Just be sure to secure them properly.
>>
>>
>>
>>If you wire two capacitors in parallel, the mfd rating becomes the total
>>of
>>the two mfd ratings. The voltage rating will be equal to the lowest
>>voltage
>>rating on either capacitor. e.g.: a 35mfd/370v plus a 10mfd/440v is equal
>>to
>>a 45mfd/370v.
>>
>>
>>
>>If you replace a three terminal dual 35mfd/10mfd/370v capacitor, you can
>>use
>>a three terminal 35mfd/5mfd/370v and a separate 5mfd/370v, two terminal
>>capacitor. Put a jumper wire from the 5mfd capacitor's "C" terminal to the
>>"C" terminal on the three terminal capacitor, and another jumper from the
>>other terminal of the 5mfd capacitor to the terminal marked "Fan" on the
>>three terminal capacitor. You can also use a two terminal 35mfd/370v
>>capacitor and a separate two terminal 10mfd/370v capacitor. Either one of
>>these combinations will get the job done.
>>
>>
>>
>>You can make a lot of combo's this way.
>>
>>
>>> Which HVAC capacitors are most likely to fail? (run caps, starting
>>> caps or does it matter)
>>>
>>> If there a brand that's better then the rest?. It appears they all
>>> come from Mexico or China. I can't seem to find Mallory or GE any
>>> more.
>>>
>>> If a dual 440V cap is rated as 60+10 is either a 55+10 or 60+7.5 an
>>> acceptable substitute long term?
>>>
>>> TIA
>>
>>
>



Posted by Joseph on January 27, 2008, 6:00 pm
> There's also the Amrad Turbo200 field configurable cap.
>
> http://www.americanradionic.com/content/view/31/61/
>
> I just wonder if they're a reliable cap?

It is not recommended to undersize a capacitor at all for either voltage or
mf. You
can go up to 10% over on mf rating and I don't know what the over voltage could
be allowed
(I frequently use 440 for 370).

I have found them to be very reliable. I keep 2-3 of them on the truck and
use them
when I have to. I normally will have the right cap in the truck though.
Inexpensive to
stock the truck with a complete inventory of both the run and start varieties.
Cost is
the issue for using them exclusively over the OEM caps.

In fact I carry the sizable V-belts on the truck too. After lengthy field
trials
they appear to last as long or longer than the regular v-belts. Again the issue
for not
using them exclusively is the cost factor. But great for emergencies and when a
trip to
the supplier is costly.

Joseph
--


When you give a lesson in meanness to a critter or person, don't be surprised if
they
learn their lesson.

If you're ridin' ahead of the herd, take a look back every now and then to make
sure it's
still there.

If you find yourself in a hole the first thing to do is stop diggin'.

Never ask a barber if he thinks you need a haircut.

Never miss a good chance to shut up.

--






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