Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-03-2018, 09:17 PM   #1
Michael Wild
 
1978 31' Sovereign
1984 31' Airstream310
Edmonton , Alberta
Join Date: Jul 2014
Posts: 86
Dometic Penguin II NOT Performing...

I just bought a Dometic Penguin II air conditioner from Amazon and it is not performing as well as the original AC on my 1984 Airstream 310 MoHo.

I am very disappointed. I bought the new AC because I was expecting a more efficient and better performing unit than the 34 year old one.

Is this normal, or did I get a bad unit?

With an inside air temp of 34C/93F it was only pumping out 30C/86F air.
Attached Thumbnails
Click image for larger version

Name:	6C8B8B14-2358-4FE6-BE8D-3E2FB81A4C12.jpg
Views:	68
Size:	105.2 KB
ID:	312922   Click image for larger version

Name:	A91AAC41-0CE0-49D6-A6F0-F9F109CF9BD3.jpg
Views:	71
Size:	122.7 KB
ID:	312923  

Click image for larger version

Name:	8AA392ED-7734-4894-8A49-004991CE271F.jpg
Views:	67
Size:	107.9 KB
ID:	312924  
__________________

Michael_Wild is offline   Reply With Quote
Old 06-03-2018, 09:33 PM   #2
Overland Adventurer
 
AtomicNo13's Avatar
 
1991 34' Excella
2009 34' Panamerica
Telluride , Colorado
Join Date: May 2012
Posts: 2,450
My penguin is pathetic as well.
The air box is terrible at distributing the air....
My 30 year old unit made my AS like a meat locker... This new one is crap.
__________________

AtomicNo13 is offline   Reply With Quote
Old 06-03-2018, 09:43 PM   #3
Rivet Master
 
Belegedhel's Avatar
 
1973 21' Globetrotter
Houston , Texas
Join Date: Sep 2009
Posts: 2,545
Huh?
Belegedhel is offline   Reply With Quote
Old 06-03-2018, 09:59 PM   #4
Michael Wild
 
1978 31' Sovereign
1984 31' Airstream310
Edmonton , Alberta
Join Date: Jul 2014
Posts: 86
Quote:
Originally Posted by AtomicNo13 View Post
My penguin is pathetic as well.
The air box is terrible at distributing the air....
My 30 year old unit made my AS like a meat locker... This new one is crap.
Is it the difference between the older units that used freon and the newer ones that don't?
Michael_Wild is offline   Reply With Quote
Old 06-03-2018, 10:13 PM   #5
Michael Wild
 
1978 31' Sovereign
1984 31' Airstream310
Edmonton , Alberta
Join Date: Jul 2014
Posts: 86
Quote:
Originally Posted by Belegedhel View Post
Huh?
Do you have any experience with these?
Michael_Wild is offline   Reply With Quote
Old 06-03-2018, 10:14 PM   #6
Michael Wild
 
1978 31' Sovereign
1984 31' Airstream310
Edmonton , Alberta
Join Date: Jul 2014
Posts: 86
Is the Coleman Mach 8 any better?
Michael_Wild is offline   Reply With Quote
Old 06-03-2018, 11:10 PM   #7
2 Rivet Member
 
1970 27' Overlander
Poteau , Oklahoma
Join Date: May 2018
Posts: 30
Actually, I think that is pretty good and normal. Your inside air is 93 and in one trip across the coils it is lowering the air temp 7 degrees. So the theory is when all the air inside the camper has been replaced with the now cooler 86 the next round trip displacement of all the air inside the camper would drop it down another 7 to a comfy 79. I think most auto AC only drops about 2-3 degrees each round trip displacement but the volume of air is small so it replaces the air with cooler fairly fast.

This is simplified of course and don't take into account skin heating, drafts, air mixing ect but given time that ought to be pretty good. But as another member stated you can never get the efficiency vs the older units with more efficient refrigerant of R22 vs the the new stuff which which has to run at higher pressures to even compete with the old freon.
Hi, my name is Mr. Armstrong. Miss me yet? Mine is 48 years old and still blowing ice cubes. Replace it? Not on your life until it absolutely croaks and I cant find a part anywhere.
cowdiddly is offline   Reply With Quote
Old 06-04-2018, 05:14 AM   #8
Rivet Master
 
bobmiller1's Avatar

 
2005 34' Classic S/O
2006 39' Land Yacht 396 XL
north blenheim , New York
Join Date: Sep 2012
Posts: 1,947
The Penguin is the best unit I have ever installed.....try their customer service for help.....maybe you missed something on the install, sounds to me like your compressor my not be running, based on your picture the left knob should be set to max, not AC FAN, Regards, Bob
bobmiller1 is offline   Reply With Quote
Old 06-04-2018, 10:17 AM   #9
2 Rivet Member
 
gr.austin's Avatar
 
2009 27' FB Classic
Sioux Falls , South Dakota
Join Date: Oct 2009
Posts: 98
Here is a rule of thumb: Find how much air the A/C is moving. A 13,500 BTU unit should be moving about 400-500 CFM. Look in the specifications. Now measure the temperature of the air going into the A/C. Getting as close to the Evap coil measure the air leaving the A/C. Subtract these two temps, Multiply by 1.08 and then by the CFM you looked up. This should be close to the rating of the unit: 13,500. So you see that 7 degrees is just not right.


Does the 7 degrees increase when you put the unit on low fan?


Are you making a lot of water? If you are then the drop in temp is reduced by the amount of water that is being made. If very little water you have a problem.



Your symptoms do suggest that the unit has lost charge or the expansion device is blocked or stuck.


I would also check if there is anything blocking the coils like stretch wrap or cardboard.



I would expect that 13,500 / 1.08 / 500 would give you at delta temp of 25 degrees.


The leaving air temp should be 65-70 degrees with 93 return air.


This problem certainly requires a call to Dometic to see how they are going to handle the warranty.


There are lots of potential issues and trouble shooting does require a trained service person. Fixing this is not for the DIY. This problem could KILL (no kidding) the untrained. Please call a professional to fix this under warranty and Dometic guide.


Happy streaming
gr.austin is offline   Reply With Quote
Old 06-04-2018, 07:03 PM   #10
2 Rivet Member
 
mikesSE's Avatar
 
2007 23' Safari SE
ROSWELL , Georgia
Join Date: Sep 2008
Posts: 86
Images: 14
My second Penquin 2 sucks.I bought it new last year and it failed and was replaced by Dometics as they knew it was faulty.The new replacement does not cool until it has run thirty minutes,then only marginal compared to the old Penquin 600.The load starting is terrrible and I can't run it on a 5000 Honda to start it.Dometics screwed the pooch on this one!
__________________
Mike & Nancy Gore WBCCI #2914 S E Camping Unit 012 Roswell,Ga.
mikesSE is offline   Reply With Quote
Old 06-05-2018, 05:43 PM   #11
Rivet Master
 
bobmiller1's Avatar

 
2005 34' Classic S/O
2006 39' Land Yacht 396 XL
north blenheim , New York
Join Date: Sep 2012
Posts: 1,947
Interesting .......
bobmiller1 is offline   Reply With Quote
Old 06-05-2018, 06:14 PM   #12
Moderator
 
jcanavera's Avatar

 
2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 9,245
Images: 143
Send a message via AIM to jcanavera Send a message via Skype™ to jcanavera
Is that AC/fan switch a fan speed switch? If so, on a cool down you should be set a max fan speed. Depending upon heat gain (say you are in full sun) this will provide the best initial performance of your system. Once cooled down you can change that fan speed to what works best for you. Just did a little checking and that switch gives you multiple speeds for cooling. So obviously to get max cooling you need that fan set to high.

I pulled this from an article on poor RV ac performance.

A. Temperature change.

In other words what the difference is between the temperature of the air going into the filter and the air coming out the discharge. The technical books say this difference should be a nominal 20° with the compressor running. I have seen it as high as 32° and as low as 16°. Some considerations for this temperature difference are:

• The two thermometers used to determine the temperature difference must be calibrated to each other.

• The books say the compressor should run for 30 minutes before the temperatures are taken.

• The temperature differential will be inversely proportional to the relative humidity. The condensation out of very humid air will build up on the evaporator just as the air filter contaminants mentioned earlier and act as an insulator.

So assuming your unit is new, I'm assuming that there is no packing materials that were forgotten that may be interrupting air flow. Secondly the amount of humidity in the air will absolutely affect the output air temperature. Until that moisture gets wrung out, a lot of the cooling will be spent on removing that moisture in the air. So let that unit run at high speed for at least 30 minutes to an hour and measure that temperature at the filter intake and the cooler air coming from the discharge. If you aren't getting at least 15 F+ difference between intake our outflow, you may have a problem. If you are then the only thing I could consider is the unit may not be able to overcome the heat gain. I had this issue with a 2001' 27' Safari in full sun hot weather. We dealt with that by adding a Zip Dee awning that spanned about 20' of the street side. That unit was 13,500 BTU's. When I ordered my 30' Classic I upgraded to a 15,000 BTU unit. (13.5 K was the standard at that time)

Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
jcanavera is offline   Reply With Quote
Old 06-05-2018, 07:26 PM   #13
Rivet Master
 
Al and Missy's Avatar

 
2002 30' Classic S/O
Melbourne Beach , Florida
Join Date: Nov 2013
Posts: 3,536
If the gauge you showed is indicating humidity on the top and temperature on the bottom, at 33% humidity you should be getting better cooling. Heat gain into the trailer will determine the ultimate temperature but has no effect on the temperature drop across the unit. I'd say a call to Dometic is in order.


Al
__________________

"You cannot reason someone out of a position they have not been reasoned into"

Al, K5TAN and Missy, N4RGO
2002 Classic 30 Slideout
S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
2001 Safari 25 RB Twin (Gone, but not forgotten)
WBCCI 1322, TAC FL-39, AIR 82265

Al and Missy is offline   Reply With Quote
Old 06-05-2018, 07:34 PM   #14
Rivet Master
 
Al and Missy's Avatar

 
2002 30' Classic S/O
Melbourne Beach , Florida
Join Date: Nov 2013
Posts: 3,536
If the gauge you showed is indicating humidity on the top and temperature on the bottom, at 33% you should be getting full cooling from the unit. Also it seems that the trend is up, not down, as it should be if the unit is operating properly.


Heat gain into the trailer will determine the ultimate temperature and the time to get there, but does not affect the temperature drop across the unit. You should get a minimum of 15 degrees and hopefully more like 18-20. To be sure the measurement is accurate, one thermometer should be in the inlet air stream and one in the outlet, as close to the coils as possible.


I'd say a call to Dometic is in order.



Al
__________________

__________________

"You cannot reason someone out of a position they have not been reasoned into"

Al, K5TAN and Missy, N4RGO
2002 Classic 30 Slideout
S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
2001 Safari 25 RB Twin (Gone, but not forgotten)
WBCCI 1322, TAC FL-39, AIR 82265

Al and Missy is offline   Reply With Quote
Reply


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
New Dometic Penguin II 15k not working wulfraat General Repair Forum 17 07-07-2017 05:25 PM
Penguin I to Penguin II drain pan? HiJoeSilver General Repair Forum 1 05-25-2015 04:51 AM
Tail Lights: Flashing Slowly/Performing Poorly bgordon Lights - Interior & Exterior 13 09-10-2012 04:11 PM
Dometic Penguin A/C Main Cycle Board Saigon Furnaces, Heaters, Fireplaces & Air Conditioning 0 06-03-2004 02:20 AM
Dometic Penguin for '66 Safari? markh8624 Furnaces, Heaters, Fireplaces & Air Conditioning 21 02-24-2004 05:30 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.