RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Country Coach Owners Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-20-2017, 11:26 PM   #1
Senior Member
 
Join Date: Nov 2015
Posts: 444
Dometic Air Conditioner Capacitor?

My 16 year old Penguin 15k BTU in my bedroom is causing my Onan generator to go into an overvoltage fault when it starts. It starts and cools perfectly on shore power. I spoke with Onan who informed me this problem is likely caused by a bad capacitor in the Penguin. Has anyone dealt with this? I have found the original capacitor. I also see these "hard start" capacitors. Which should I get?

Rich 2002 Magna
birdhunter is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-20-2017, 11:47 PM   #2
Senior Member
 
SpringerPop's Avatar
 
Join Date: Jul 2012
Location: SFV, CA
Posts: 222
If it starts and runs normally when on shore power, the capacitor is OK. You may wish to investigate installing a "Hard Start Capacitor" in your Penquin, though. It's an additional capacitor that adds capacitance for starting the compressor, then cuts itself back out of the circuit in a few tenths of a second. Pop
__________________
"You never know what's waiting around the corner,
but don't let that slow you down"
-Terry Baucom-
SpringerPop is offline   Reply With Quote
Old 03-21-2017, 11:57 PM   #3
Senior Member
 
Join Date: Nov 2015
Posts: 444
Quote:
Originally Posted by SpringerPop View Post
If it starts and runs normally when on shore power, the capacitor is OK. You may wish to investigate installing a "Hard Start Capacitor" in your Penquin, though. It's an additional capacitor that adds capacitance for starting the compressor, then cuts itself back out of the circuit in a few tenths of a second. Pop
Thanks I will order one of them. Sounds like a little Viagra for my old penguin.
birdhunter is offline   Reply With Quote
Old 03-22-2017, 07:22 AM   #4
Senior Member
 
Join Date: Jul 2007
Posts: 1,015
Good info on the capacitors here

http://www.irv2.com/forums/f112/dome...ml#post3333323
__________________
Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
phays is offline   Reply With Quote
Old 03-22-2017, 11:25 PM   #5
Senior Member
 
Join Date: Nov 2015
Posts: 444
Quote:
Originally Posted by phays View Post
Thanks that is very helpful. I was advised that given that my air conditioner runs perfectly other than on Shore power, the capacitor was probably okay and to get the hard start kit and added in. I have ordered one it's on the way. I have not been up there yet but I will see what the condition of the original capacitor looks like when I do get up there. If it looks like the one of the picture I guess I'll be getting another one.

Rich 2002 Magna
birdhunter is offline   Reply With Quote
Old 03-22-2017, 11:26 PM   #6
Senior Member
 
Join Date: Nov 2015
Posts: 444
Quote:
Originally Posted by birdhunter View Post
Thanks that is very helpful. I was advised that given that my air conditioner runs perfectly other than on Shore power, the capacitor was probably okay and to get the hard start kit and added in. I have ordered one it's on the way. I have not been up there yet but I will see what the condition of the original capacitor looks like when I do get up there. If it looks like the one of the picture I guess I'll be getting another one.

Rich 2002 Magna
I meant other than on generator power.
birdhunter is offline   Reply With Quote
Old 03-23-2017, 12:46 AM   #7
Senior Member
 
Join Date: Jun 2016
Location: Minden nevada
Posts: 660
I agree if it functions ok on shore power the capacitors are ok. Adding a hard start capacitor across the existing start capacitor shouldn't make the unit run any better if the existing start capacitor is ok.
Roy1 is offline   Reply With Quote
Old 03-23-2017, 01:48 AM   #8
Senior Member
 
Join Date: Nov 2014
Location: TEJAS
Posts: 709
The thing I don't like about hard start caps is they generally are controlled by a ptc thermistor element which operates like a thermal switch. The AC is turned on, the hard start cap is enabled until the ptc element gets hot. This draws extra power even if the compressor is started. I removed my hard start caps and installed a potential relay with a start cap. Once the motor is up to speed the start boost is disabled. It also instantly resets, something a ptc won't do, they take about 3 minutes to cool down.

Looky here for theory.

10.3 Potential Relays - 10.4 Solid-State Starting Relays and Devices - 10.5 Motor Bearings - 10.6 Motor Drives (Components for Electric Motors)
spyderRV is offline   Reply With Quote
Old 03-23-2017, 11:46 PM   #9
Senior Member
 
Join Date: Nov 2015
Posts: 444
Quote:
Originally Posted by Roy1 View Post
I agree if it functions ok on shore power the capacitors are ok. Adding a hard start capacitor across the existing start capacitor shouldn't make the unit run any better if the existing start capacitor is ok.
It runs fine. The only problem is that its causing an overcurrent fault on the generator on startup. Supposedly the hard start kit will prevent the generator from sensing an overcurrent situation when the AC starts. At least that's what I've been told. Supposedly ,as these units age the compressors wear and can cause more than the usual start-up draw. I don't know if any of this is true but that's what I was told.

Rich 2002 Magna.
birdhunter is offline   Reply With Quote
Old 03-23-2017, 11:49 PM   #10
Senior Member
 
Join Date: Nov 2015
Posts: 444
You mean something like this?

Rich 2002 Magna
birdhunter is offline   Reply With Quote
Old 03-25-2017, 07:57 PM   #11
Senior Member
 
Join Date: Jun 2016
Location: Minden nevada
Posts: 660
I don't think your compressor is getting harder to get started due to age. I'm just saying if your unit has an existing start capacitor and a matching potential relay adding a second hard start kit probably won't help. If it has a thermistor unit instead of the start capacitor and relay that is another story. Also if you turn up the thermostat then turn it down does it take a few minutes or more for the compressor to try to restart? It should try to start after a few minutes rather then right away as the differential pressures need to equalize for less startup amps. Good luck it is a bummer on a hot day with no a/c. Did you check and make sure your generator is running at around 120-125 volts at 60 hertz ? If the voltage is low the compressor will be hard to start.
Roy1 is offline   Reply With Quote
Old 03-25-2017, 08:35 PM   #12
Senior Member
 
Join Date: Jun 2016
Location: Minden nevada
Posts: 660
I don't think your compressor is getting harder to get started due to age. I'm just saying if your unit has an existing start capacitor and a matching potential relay adding a second hard start kit probably won't help. If it has a thermistor unit instead of the start capacitor and relay that is another story. Also if you turn up the thermostat then turn it down does it take a few minutes or more for the compressor to try to restart? It should not try to start after a few minutes rather then right away as the differential pressures need to equalize for less startup amps. Good luck it is a bummer on a hot day with no a/c.
Roy1 is offline   Reply With Quote
Old 03-26-2017, 12:15 AM   #13
Senior Member
 
Join Date: Nov 2015
Posts: 444
Roy I have no idea if I have a thermister. It has a start capacitor, that I know. It is an older penguin 15K BTU heat pump circa 2001. I was told by Dometic that the additional hard start capacitor came standard on the later units like this but not on mine. What I have purchased is a factory Dometic add-in hard start kit. It does use a PTC. Tomorrow I go up on the roof so we will see what happens and what I find. I will try to wire in the hard start kit and test things with the generator. If it doesn't solve the problem I will remove it. I am plugged into Shore power so I do have air conditioning. In the summer though I am not and I need it to run off the generator at times as it always has.
birdhunter is offline   Reply With Quote
Old 03-27-2017, 01:12 AM   #14
Senior Member
 
Join Date: Nov 2015
Posts: 444
Roy I am afraid that my time on the roof revealed not good news: upon closer examination it's not just a starting problem. On Cooling it starts up onshore power and I said it cools beautifully but after a while say 10 minutes or more the compressor cuts out the fan stays on for some minutes it then shuts down completely for some minutes and the cycle then starts all over again. It appears to be drawing about 12 to 14 amps when the compressor is running which I believe is normal. On the heat pump mode, it Heats like hell for up to about 20 minutes, the compressor shuts down fan stays on for a little while it then shuts down completely. During the heat pump cycle when the compressor is running it can cause much as 25 amps, which I do not believe is normal. I do not know what is causing this but something tells me it's not a capacitor. The capacitors look physically okay. Any suggestions are welcome.
birdhunter is offline   Reply With Quote
Reply

Tags
air conditioner, dometic



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing carrier air conditioner capacitor mover RV Systems & Appliances 11 03-22-2018 10:44 PM
Air conditioner start capacitor 1ciderdog RV Systems & Appliances 8 08-30-2012 06:23 PM
Coleman Mach Air conditioner Capacitor and wiring treetop Travel Trailer Discussion 7 06-25-2012 09:15 PM


All times are GMT -6. The time now is 09:49 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.