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DFord

Near St Louis, MO

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Posted: 07/20/19 11:39am Link  |  Quote  |  Print  |  Notify Moderator

If it's the "start" capacitors that are blowing that quick it's because they're in use too long. The start capacitors are usually round in black hard plastic cases. There is a "start relay" that should take them out of the circuit (disconnect) them as soon as the compressor reaches 3/4 full speed (that like the blink of an eye). They're only designed to do that 60 times an hour without damage. If they're in the circuit any more than that they overheat and fail very quickly. That could also damage the start windings inside the compressor.


Don Ford
2004 Safari Trek 31SBD (F53/V10 20,500GVW)
'09 HHR 2LT or '97 Aerostar MiniVan (Remco driveshaft disconnect) for Towed vehicles
BlueOx Aventa II Towbar - ReadyBrake Inertia Brake System


down home

south

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Posted: 07/20/19 02:58pm Link  |  Quote  |  Print  |  Notify Moderator

real4u2c wrote:

Quick history all.

AC's were running, then back ac quit last week, Fan runs on high and low no problems , compressor wouldn't energize, slight hum. This morning, front ac fan was running, but compressor wouldn't start and a terrible odor, something melted maybe??? Anyway, after I open the windows and ran the fantastic fans a while, I ran both ac's on high and low fan, all was well,. Tried to run the ac's for cooling and heard compressors try to start, followed by a humming, I turned them both off immediately, oh and no breakers tripped and no fuses burned. Any suggestions will help, thanks. I got Rv on a dedicated 30amp / 125vac feed, and excellent line voltage / and amperage protection in the Rv, fed from my 200 amp house panel.


Capacitors!Just about everyone has to replace one during ownership.
The smell was the rubber/plastic capacitor case etc trying to burn.
This has happened a lot over the last decade.
Had a conversation with AC parts warehouse mgr. Home units RV units.
He has those marked made in the USA but are identical to ones marked made in China because they are but cost $10.00 more.
Home units replaced four in to years. So far on RV replaced two. Found old ones, made in the USA in Elkheart Indiana.
We have two new units for home and so far in a year not replaced capacitors. They don't have to be identical to the old ones to work and ones marked with a higher rating will work as long as they have have the required spades. Extras on it don't matter is what he said. ..but they do have to fit need to be held in palace by that clamp or something.

wa8yxm

Wherever I happen to park

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Posted: 07/20/19 04:28pm Link  |  Quote  |  Print  |  Notify Moderator

Well I got my new start caps in as well.. Great improvement but not yet 100%

Still trips in the EXTREME heat we have this week but Sunday is supposed to be better and holds all night now.. and most of the day.. Trippy from about 2 to 6 PM of course it just started raining so it's working fine in the rain.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


DFord

Near St Louis, MO

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Posted: 07/20/19 09:24pm Link  |  Quote  |  Print  |  Notify Moderator

Start capacitors are only there to provide a boost to the compressor to get it started instantly. They provide up to 5 times the torque to get the compressor spinning than without one. They are not meant to be in use from more than a split second or they'll fry themselves. Capacitors are made by tightly wrapping aluminum foil and waxed paper around each other. When they overheat, the wax melts and boils creating pressure that spews out the top of start capacitors or bulges the top of run capacitors. One time is all it takes to ruin them. The run capacitor is in the circuit all the time but a relay of some type. The mechanical relays of old had contact points that could stick closed and ruin the capacitor. New methods use a solid state device that's operated by heat. Run capacitors are most likely damaged by spikes in voltage that burns a hole between the layers of foil and short out the capacitor.

It's hard to find any made in the USA today but they are considered much better quality and closer to specs than those made in China but cost wins out almost every time and China has the market cornered right now.

pianotuna

Regina, SK, Canada

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Posted: 07/20/19 10:13pm Link  |  Quote  |  Print  |  Notify Moderator

real4u2c,

If I understand you correctly, you are attempting to run 2 air conditioners on one 20 amp shore power supply with both running?

That may be likely to result in quite low voltage.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

down home

south

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Posted: 07/21/19 10:52am Link  |  Quote  |  Print  |  Notify Moderator

20 amp shore power??? I missed that. It will not bode well for your ACs and other devices.
When we stored our unit on 20 amp we had to start the generator to use AC while preparing to head out. I might well run one ac and nothing else.
We have an inexpensive volt meter plugged in near the stove.If ac power drops below 105 we cut on the generator. AC load handling system will shed devices to save them. We can run two ACs on 30 amp but but system will shed loads including one AC if necessary. if the volts are normal between 110 and 130.
Don't try to run even one AC along with anything else on 20 amps.I think it takes 23 amps t start and goes down to 14 amps to run one ac.

* This post was edited 07/21/19 04:06pm by down home *

real4u2c

Hampton, Va.

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Posted: 08/06/19 06:53pm Link  |  Quote  |  Print  |  Notify Moderator

Both compressors fried, any suggestions on brands?


Retired Marine with Retired Navy woman2004 Fleetwood Pace Arrow 37 C, Workhorse p32 chassis, 8.1l gas engine.

real4u2c

Hampton, Va.

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Posted: 08/06/19 06:54pm Link  |  Quote  |  Print  |  Notify Moderator

New ac's, is there one better than the other?

pianotuna

Regina, SK, Canada

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Posted: 08/06/19 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

Low voltage does that. Look into an autoformer.

real4u2c

Hampton, Va.

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Posted: 08/06/19 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

I have an autophormer, **** nice peice of equipment. My ac's were old, I am not sure what brand will work with my older than dirt thermostat. I have contacted a few online sites to get some feedback. But the best recomendations come from this site, RV owners.

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