Motor Run capacitor

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On 2/12/2012 7:22 PM, gregz wrote:

That's why I recommend surge arresters on HVAC equipment. Around here in the summer months is when we have a lot of thunderstorms and the darn lightning strikes occur when the AC is running wide open. Voltage spikes travel a long way from a strike and of course power may cut in and out a lot so I always install a anti-short cycle timer to protect the compressor from slamming on and off when under load. Most electronic thermostats have the timer built in but there are a lot of mechanical thermostats out there.
TDD
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*************** Good Policy**********************

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wrote:

Picked up a Dayton cap at local supplier. One that was in it was a Supco. The Dayton was a lot more expensive than the Supco. Are they better? I use a Dayton motor on my tablesaw and it is probably 30 years old and still going.
Jimmie
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<...snipped...>

Dayton usually refers to one of WW Graingers in-house brand names. Graingers list prices are almost always Way To High, and even with their best corporate discount, it's usually not hard to find a less expensive source.
--
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plausible, and wrong." (H L Mencken)
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I'll bet it was the same last season. What is the tolerance written on it. What temperature was is. They reduce when warm.
I say replace it. This might work if it's the same voltage rating. From granger.
http://www.drillspot.com/products/505201/dayton_2mdv4_motor_run_capacitor
Greg
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If the AC works ok, leave well enough alone. These periiodic checks are fine, but checking capacitance sounds like the tech was hunting for some way to maake some $$ because nothing else was wrong.
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On Sat, 11 Feb 2012 15:07:50 -0800 (PST), "hr(bob) snipped-for-privacy@att.net"

to start on a very hot day next summer, good luck getting a tech to look at it and fix it in a timely manner. The time to fix it is before it quits, and when you do not need it.
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If you got the right kind of breaker, you can put this attached to breaker box in parallel with HVAC, and will function whole house also. It can attach at HVAC also.
http://www.drillspot.com/products/1383845/Supco_SCM150_Surge_Protectorii
Greg
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This has stranded leads which is somewhat of a problem, you need a breaker that will work on stranded leads. The last one I had, blew up. I also see these have a lower clamping voltage than many. I see these on Holmes on homes. its better to protect HVAC locally. In the main box, you normally use a dedicated 2 pole breaker.
Greg
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When my suppressor went, there was a storm. The lights went out, back on, off, bang went the suppressor.
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A motor run capacitor has a leeway of plus/minus 10-15% in microfarads (generally) without causing any problems with what its hooked up to. This very low capacity Capacitor would be inexpensive to replace if it needed it ...and just a matter of 3 push on wires most of the time.
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For the record, I told of me using a surge suppresser, I prefer spike protector name. Some spike or surge took out my device. I feel fortunate. I have a new one installed.
BUT
A friend in Ohio sort of lives in a rural type area. They have got hit 3 separate times with maybe direct hits. Each time all suppressors were wiped out, including whole house. Many or most electronic elements were taken out. After each hit, all wiring was inspected, all suppressors replaced, grounds inspected, electronic equipment replaced. Just waiting for number FOUR.
Suppressors will not protect equipment from direct hits. They may help human safety and help prevent fires.
Greg
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I forgot to mention, the Ohio party also has lightning rods. I don't think they have had any fires.
Greg
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On 2/15/12 9:09 PM, gregz wrote:

Is the friend right at the end of the power line by chance?
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I don't know her situation.
Greg
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I would suspect a grounding problem in the house. Perhaps there are two? A water pipe being used for a ground?

Nothing will. Direct hits are quite rare, though.
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I was getting worried last fall. Neighbor got hit once each in two separate storms within a week. Right across street. I don't think her home was affected, but you should see what it did to a pine tree. The tree exploded and split half way down. The other tree just looks like half of it died. She is waiting to see how it holds up. Going to cost a couple thousand to chop it up.
Greg
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