Re: AC Not Working Reply #25 – July 08, 2022, 09:17:44 pm Ok Greg, the big black thing is the compressor and they run very hot, burn your hand hot. The clue here is the small accumulator to the side of the compressor the copper line from it to the compressor appears to be frosted. If it is, then you need to get to the bottom of no fan motor. As Steve said, does it turn freely. If yes, is the motor itself very hot to the touch? If it's hot then you still may have a run capacitor issue if there is a separate capacitor or it might be the selector switch ( low, med, high ) If it's the selector switch the motor will not be hot and it should turn free. Your fan motor is critical as it is the indoor blower motor and the condenser fan so you need that motor to run.Jon 1 Likes
Re: AC Not Working Reply #26 – July 08, 2022, 09:28:19 pm According to the wiring diagram in your post 13 you have a run capacitor that has two separate capacitors in one. One side for the compressor the other side for the fan, center is common. If everything checks out it's almost pointing to the control board. Jon
Re: AC Not Working Reply #27 – July 09, 2022, 08:25:37 am I think Jon and Steve have given you some great advice. When I read you post that I responded to yesterday, I was in something of a hurry, but mainly wanted you to know that it was not doing your compressor any good to continue to run it when the fan motor was not running. Replacing the capacitor is easy. Oiling the motor could be easy if it has the oil ports on the motor housing. It seems like the industry trend has been to permanently sealed motor lately. BUT, even if he motor is sealed, it should be replaceable. That would be cheaper than a new A/C unit. I don't remember how old your unit is, but if its fairly recent, I would most likely replace the motor if that turns out to be the problem. As Jon implied, further diagnosis depends on getting the fan motor running. And I hope I'm guessing correctly...getting the fan motor running will be the "fix".KenAs an afterthought, I seem to remember ( which is really dangerous, so proceed with caution) that removing the interior shroud exposed the squirrel cage fan, which is on the shaft of the motor in question. BE SURE TO REMOVE ALL 120 VOLT POWER. Then remove the interior shroud. You should be able to easily spin the cage and it remain going around. If it is at all difficult to spin or doesn't continue to spin, the bearings on the motor may be keeping it from running. Then you could could go up on the roof and see if the motor has oil ports. Just a thought.
Re: AC Not Working Reply #28 – July 09, 2022, 11:32:49 am Greg; At the age of rig, the fan motor shouldn't be seized up. Since this rig came from Florida, I suspect it ran a lot due to heat and humidity there. Along with high temperatures. The most likely failure is the starting capacitor for the fan blower. It is inside the same housing as the starting capacitor for the compressor motor, a double unit. If the blower fan blades turn easily, replace the double cap unit. Flip off the circuit breaker in the distribution panel. Unplug shore power, (and no generator). There is usually a 'bleeder' built in for safety, and they both are likely connected to motor windings that will dissipate any charge. After a few minutes, I'd use a screwdriver shaft to temporarily short each terminal to ground (to ensure safety). There should be no spark. These caps do go bad. That's why both are in the same unit. (might as well replace both. If one failed the other might be near failure). So likely there are pull off terminals. Mark them as to which terminal went where. Remove them and remove the capacitor. Now you can try testing it, or just replace it anyway. Testing isn't hard, but maybe for advanced meter users. Hope this helped Greg. Don't fall off of the roof! RonB
Re: AC Not Working Reply #29 – July 09, 2022, 12:08:25 pm Greg, like Ron said you may have a failed run capacitor. In your case the capacitor for the fan and the compressor are in one. A dual capacitor if you will. Usually if a run capacitor fails the motor will not start and it'll cycle on it's internal overload that's why you need to feel the motor and see if it is hot. If it is hot and turns free definitely replace the run capacitor. If it is cool to the touch and turns free, look at where the motor gets it's power. I think you will find it comes off the solid state control board.Jon
Re: AC Not Working Reply #30 – July 09, 2022, 12:24:33 pm Thanks for everyone's input! The squirrel cage fan is accessible from the roof and turns easily. Is there another fan inside the coach?I measured the physical dimensions of the large capacitor as Ron suggested (2 1/8" diameter by 4 1/8" long). There are three groupings of terminals on the top of the cap (5, 3, and 2). Is that because it's a dual cap? I'll be doing some research today and order the new cap.If I fall off the roof (or fry myself discharging the cap) and survive, I figure it will only make me stronger! 1 Likes
Re: AC Not Working Reply #31 – July 09, 2022, 01:39:30 pm So looking at Amazon, I'm not able to exactly match my capacitor. I was searching for 55/15 uF (which is a measure of capacitance, according to Google). Does the replacement need to be an exact match? Here is a photo of the existing cap:
Re: AC Not Working Reply #32 – July 09, 2022, 02:37:01 pm Hi Greg; A match in size and shape since it is probably a tight fit. The capacitance can be larger, since heat exposure and age cause the values to decrease. A little overkill is good. You'll notice that tolerances for these caps are commonly like -10%, +40%. It's worth a try. RonB
Re: AC Not Working Reply #33 – July 09, 2022, 02:54:21 pm Quote from: RonB - July 09, 2022, 02:37:01 pmThe capacitance can be larger, since heat exposure and age cause the values to decrease. A little overkill is good. You'll notice that tolerances for these caps are commonly like -10%, +40%. It's worth a try. RonBThanks Ron. So a larger number is higher capacitance, ie, 60 is better than 55?
Re: AC Not Working Reply #34 – July 09, 2022, 03:57:03 pm Use a little caution on the MFd try to find something pretty darn close the other thing is you voltage is 370. So not only MFG ( Micro ferit) but also voltage. I think the MFd needs to be close and the voltage can be within +-10%. That part of my HVAC back ground is gone. You will be lucky to find another round one, a lot are oval which totally upsets the applecart but you can make it fit with a little effort. Do you have a local HVAC shop they probably have one on their shelf. Jon
Re: AC Not Working Reply #35 – July 09, 2022, 04:27:10 pm Just to clarify, capacitance is most often measured in microfarads, abbreviated µF (Greek letter mu followed by capital F), but also sometimes written as mfd or uF.Looking at Greg's photo, what he has there is labeled "55 / 15 µF ± 5% 370 VAC." So he needs a dual capacitor with at least 55 microfarads + 15 microfarads that can handle at least 370 volts AC. Larger values would be OK, but of course the replacement needs to physically fit in the space. As Jon pointed out, checking with a local HVAC shop may be your best bet. 2 Likes
Re: AC Not Working Reply #36 – July 15, 2022, 01:05:41 am Greg,We ran into AC problems a couple years ago.Replacing capacitor didn’t fix it but that is an inexpensive thing to try.Turned out we needed a new motor. Was a fairly easy replacement.Been working great since we did that.Here is our thread when we had the problem.Unusual Air Conditioner issue
Re: AC Not Working Reply #37 – July 15, 2022, 06:22:20 pm Thanks, I’ll check it out! Still trying to locate a capacitor.
Re: AC Not Working Reply #38 – July 15, 2022, 07:49:40 pm Greg,Search for a CAP-55/15/440R capacitor. They seem to be available from a number of vendors. There is also a 60/15 version that should work if it close enough in size. I finally replaced the start capacitor in one of our Mach-8 ACs and that fixed our start surge current problem and it now runs as it should.Art
Re: AC Not Working Reply #39 – July 15, 2022, 08:20:24 pm Greg, any electrical supply house should have one or an equivalent one - they just need a picture of the info on it.
Re: AC Not Working Reply #40 – July 15, 2022, 10:25:41 pm The biggest problem I’m having is finding one with the same physical dimensions. The existing one is pretty tight so I can’t go any larger. I’ll try contacting a supplier. Thanks!
Re: AC Not Working Reply #41 – July 17, 2022, 11:30:41 am For those interested in the Soft Start products:https://www.youtube.com/watch?v=Q_oVmsKOFTA&t=6s
Re: AC Not Working Reply #42 – July 18, 2022, 05:05:09 pm Tagging onto this thread. I too have an A/C issue which I posted about. I think I'll just throw a couple parts at mine. I want to replace the run and start capacitors and the thermistor. I think I found the correct start but I'm confused about the appropriate run. A few days back Jody posted: QuoteGreg, Type in V-000403 a bunch will pop up even amazon has them.That number brings up this one on Amazon: Run. This one indicates 60/5 uF. Mine, however, shows 60+12.5 uF. I'm out of my area on this. Do I need to get one that specifically notes 60+12.5 uF? Thanks.jor As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: AC Not Working Reply #43 – July 18, 2022, 05:34:55 pm Jor, I recommend you measure the physical size as well. If yours is like mine, it’s pretty tight where it mounts. Mine is a dual capacitor.
Re: AC Not Working Reply #44 – July 20, 2022, 11:12:51 am I am learning a lot about capacitors and such thanks to YouTube. Found these two videos and was able to safely remove it (using the screwdriver method-there was no charge on it). Tested the old capacitor and both sides are bad. Physically, it looks fine other than a little corrosion on top. Next step is to find a suitable replacement and reinstall it. I took lots of photos of the wire connections so hopefully will connect the new one properly!https://www.youtube.com/watch?v=19A9lvQ6lIAhttps://www.youtube.com/watch?v=PBoOx8YzD_s 2 Likes
Re: AC Not Working Reply #45 – July 20, 2022, 01:12:44 pm So I found this capacitor which is only slighter physically larger but may fit. This is a 55/10 vs. the original which is 55/15. Would the difference be a problem?GE Genteq Capacitor Round 55/10 uf 370 volt Z97F9974 97F9974 | eBay
Re: AC Not Working Reply #46 – July 20, 2022, 08:02:16 pm Quote from: HiLola - July 20, 2022, 01:12:44 pmSo I found this capacitor which is only slighter physically larger but may fit. This is a 55/10 vs. the original which is 55/15. Would the difference be a problem?GE Genteq Capacitor Round 55/10 uf 370 volt Z97F9974 97F9974 | eBayIt has been a LOOONG time since I had an AC motors course in college, so things are pretty rusty!My concern is that the 15 uf run capacitor was probably chosen to balance the inductive load of the compressor motor to maximize something called the "power factor". Using a 10 uf replacement could cause the motor to run slightly less efficiently and thus slightly hotter. The start capacitor is likely less critical, since it is just involved in helping the motor spin up to speed. It might be good to find a shop that fixes electric motors to get their opinion.Art 2 Likes
Re: AC Not Working Reply #47 – July 22, 2022, 12:31:03 pm Thanks for that, Art. I ended up purchasing this capacitor from Amazon. The specs should be good and physically it's only slightly larger so hopefully I can mount it in the same place.CBB65B Run Dual Capacitor 370VAC 370V AC 60/15uF 60+15uF 60MFD+15MFD... As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: AC Not Working Reply #48 – July 22, 2022, 06:00:12 pm Glad you stayed within specs. Sometimes they are a little harder to mount but if there is a will, there is a way.Jon 1 Likes
Re: AC Not Working Reply #49 – July 28, 2022, 10:53:51 am Following up on this thread. Looks like the new capacitor fixed the problem! Had no problem physically fitting the new one in as it was only slightly longer and the same diameter. Currently testing the system but everything is looking good so far!It might be a good idea to buy a spare capacitor for future use 5 Likes
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