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


Reply
 
Thread Tools Display Modes
Old 05-18-2017, 10:55 AM   #1
Senior Member
 
Thurman's Avatar
 
Join Date: Aug 2011
Location: Albany, GA.
Posts: 1,282
More Dometic A/C problems

TT: 2015 FR Coachmen Freedom Express 310BHDS. Bought new in January 2015, first Dometic unit went out in June '15, second Dometic unit went out in August '16. Warranty expired January '17. Have plans for a five day trip to Florida leaving May 25. Pulled the TT up into the driveway last Saturday to start getting everything ready and set to thermostat to 72* to make sure the A/C was working, in the driveway also puts it in full sun until late afternoon. Later that day while inside I noticed that it wasn't as cool as I thought it should be so I checked all the temps. Outside was 92*, inside TT temp was 78*. So I get the trusty digital thermometer out and check the temps. Air into the Dometic unit was 78* and the cooled air temp was 67*. Hmm, that's only an 11* differential, not good. I ran the unit until late that night and it did not get any better so I set the thermostat to 80* and called it a day. Sunday was somewhat the same. Monday the high temp at 4:00 P.M. had hit 92*. The TT inside temp was 80*. The air going into the unit was 80* with the cooled air coming out at 70*, not good again. I've been running this Dometic unit each day now to help me decide to go camping or cancel out. Late yesterday afternoon while sitting at the dinette table looking at the ceiling grill I had an idea. I've always thought that some of the cooled air was going right back into the return air grill. I made me up a piece of cardboard and used duct tape to tape it so that there was a divider below the ceiling grill to separate the air movement. Yes, I have removed the ceiling grill and using foil tape covered every possible area that could be a cross-over. About two hours after taping up the cardboard I went in and the temp in the unit had dropped 2*, the outside temp had not dropped. Hmm, more thinking now. Could there be that there was more cooled air entering the ambient air intake than I had thought? So late last night I made a box from 1/8" plywood to install over the ceiling grill to make sure the ambient air entering the grill and the cooled air did not get mixed at the grill. This morning at 10:00 A.M. the outside temp was at 80* with the TT inside temp at 78* with the thermostat set at 80* from last night. I installed the box over the ceiling grill and set the thermostat to 72*. In my opinion there seemed to be more air coming from the cooled air side then there had been. Sitting on the dinette seat I could actually feel it blowing on my feet whereas I had not felt this before. The box is designed so the intake air is approximately a foot from the cooled air outlet. I'm still using the original filter and cover. My plans are to incorporate the filter into the inlet side of the box. At 11:30 A.M. I went back in to check and the inside TT temp was 73*, it seems to be working better. The differential between the inside temp/air going into the A/C unit was 73* and the cooled air coming from the A/C was at 69*. That's only a 14* differential and I would like to see that somewhere around 17*--20* differential, which is what is on paperwork Dometic sent me some months back. So, I'll keep checking this the rest of today but as of right now it does seem that this has helped and may help me make the decision to go out next week.
Attached Thumbnails
Click image for larger version

Name:	IMG_20170518_102842486[1].jpg
Views:	198
Size:	177.3 KB
ID:	138301   Click image for larger version

Name:	IMG_20170518_103741262[1].jpg
Views:	200
Size:	181.6 KB
ID:	138302   Click image for larger version

Name:	IMG_20170518_103756670[1].jpg
Views:	195
Size:	163.8 KB
ID:	138303  
Thurman is offline   Reply With Quote
Old 05-18-2017, 11:13 AM   #2
Senior Member
 
alsdas88's Avatar
 
Join Date: Jul 2013
Location: Phoenix
Posts: 293
You have done some good work here. Thank you for posting your results. I think I am going to use your method with my unit to help it out. Mine blows cold, but when the outside temps get into the 90's, the unit just seems it cannot keep up with the heat load and runs constantly.
__________________
Alan
2012 Ram 3500 DRW Crew Cab, 6.7 HO Cummins
2014 Columbus M-340RK
'69 Chevy C-10, 396BB
alsdas88 is offline   Reply With Quote
Old 05-18-2017, 11:23 AM   #3
Senior Member
 
A32Deuce's Avatar
 
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,215
I take it that your air is not ducted. If not, then that would make a big difference.
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
A32Deuce is offline   Reply With Quote
Old 05-18-2017, 11:31 AM   #4
Senior Member
 
lgray's Avatar
 
Join Date: Nov 2011
Location: Columbia, SC
Posts: 795
Quote:
Originally Posted by A32Deuce View Post
I take it that your air is not ducted. If not, then that would make a big difference.


It may be dependent on the RV, but at 92 degrees, ducted is not the way to go. As we have found with our Fiver, the quick cool dump is much more efficient, only utilizing the ducted option at night as it is less noisy.
lgray is offline   Reply With Quote
Old 05-18-2017, 12:00 PM   #5
Senior Member
 
A32Deuce's Avatar
 
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,215
We do that for a quick cool down, like when we first get there. Once it cools then back to ducting. One difference I see is I am all white out side with awnings at all the Windows, reflective on back bed window and heavy cover over windshield. Does cool better then 10 below outside temp like some report!
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
A32Deuce is offline   Reply With Quote
Old 05-18-2017, 12:05 PM   #6
Pickin', Campin', Mason
 
5picker's Avatar
 
Join Date: Aug 2015
Location: South Western PA
Posts: 13,382
Quote:
Originally Posted by lgray View Post
It may be dependent on the RV, but at 92 degrees, ducted is not the way to go. As we have found with our Fiver, the quick cool dump is much more efficient, only utilizing the ducted option at night as it is less noisy.
This is good advice for ducted systems.

Stop and think about it... the sun is beating down on a 90+ day... the temperature of your roof in the direct sun is many degrees hotter than that.

The ducts are just a few inches (if that) below the surface of the roof. The air in those ducts quickly absorbs the heat of the surrounding area and before you know it... less than ideal air blowing out the other end.

Using the 'Quick Dump' feature is the way to go during the heat of the day.
Take a fan, set it on the floor and distribute the cooler air (cool air falls) throughout the R/V. You'll be much cooler.
__________________
_________________________________________
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.

Days Camped: '18=51 '19=58 '20=110 '21=21
5picker is online now   Reply With Quote
Old 05-18-2017, 12:14 PM   #7
Carknocker Family
 
Ida Ratherbe Camping's Avatar
 
Join Date: Mar 2013
Location: Arkansas
Posts: 690
Just some info for ya. Our TT was purchased in 2013. The first ac went out on first trip, replaced under warranty.

Fast forward to June of last year, ac started icing and not cooling. Dometic had a rash of bad 15k units, I convinced dealer to contact Dometic for warranty work due to track record. Dometic replaced unit and I requested upgrade to Penguin 15k if I paid difference.

Long story short, contact dealer and see if they, Dometic, will cover.
__________________
Nights camped 2015...20
Nights camped 2016...20
Nights camped 2017...24
2017 Ram 2500
2014 Salem 32BHDS
Ida Ratherbe Camping is offline   Reply With Quote
Old 05-18-2017, 01:14 PM   #8
Senior Member
 
Thurman's Avatar
 
Join Date: Aug 2011
Location: Albany, GA.
Posts: 1,282
Let's take these in order: "alsdas88", Thanks for the comment. Before going so far as to build anything, cut a piece of cardboard at least six inches high and the width of your ceiling grill then tape it in place to see IF you can tell any difference. You are correct that 90*+ temps play havoc with these systems.
"A32Deuce", Yes my system is ducted. Post #4, #5, and #6 are good replies as to a ducted system in hot weather.
"Ida Ratherbe Camping", My selling dealer is 90 miles away and I uses a local Dometic authorized repair guy, whom I've known for years, to change out the previous two (2) Dometic units on my TT. Steve called Dometic, with me sitting there, after changing out the second unit to see if he could get me an extended warranty. NO such luck. Having my third unit put on in August of '16 left me with only about five (5) months of warranty on my A/C unit. I made calls to the selling dealer and they told me that they have a long list of customers who have had A/C units changed out who would like to have extended warranties also. Dometic has NOT, to my knowledge, give anyone an extended warranty on their Dometic Brisk Air II 15K replacement units. Dometic has admitted that they have a problem with 15K units built within a certain time period but Dometic will not stand up and warrant the replacement units, to the best of my knowledge. The campground I'm heading to for next weekend (Jellystone Park/Madison, FL.) has some trees so I may get lucky and get to have some shade to help.
Thurman is offline   Reply With Quote
Old 05-18-2017, 01:50 PM   #9
Citrus County, Fl.
 
GL1800Rider's Avatar
 
Join Date: Apr 2014
Location: Hernando, Fl
Posts: 2,179
I am on my 3rd Dometic AC. Purchased as a new order and received June 15. That AC froze up Sept 15 and was replaced. The replaced unit stopped cooling May 16 and replaced by a mobile tech in a campground. Dometic was out of Brisk II units so they sent a Penguin. Has worked great since.
__________________
2016 Forester 3011DS
2017 Toyota Corolla SE toad
PREVIOUS: 2015 Flagstaff 832IKBS
99 Terry 31G
GL1800Rider is offline   Reply With Quote
Old 05-18-2017, 02:00 PM   #10
Senior Member
 
Iwannacamp's Avatar
 
Join Date: Aug 2013
Posts: 7,855
For the OP... I assume it used to work... This tells me it isn't an overloaded condition. That only leaves a few options... low refrigerant flow/charge, low air flow condenser or evaporator or both, low compressor capacity.

If it were mine(understand I would work on it), but surely you know someone who does a/c work on the side(not cars). I would install quick taps and see what's going on. If it is low...then there is a leak. Fix leak and recharge(or chunk for new). If its dirty then clean it. If it's a bad compressor.. chunk it.
__________________
2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
born in Texas.... live in Arkansas
Iwannacamp is offline   Reply With Quote
Old 05-18-2017, 02:10 PM   #11
Carknocker Family
 
Ida Ratherbe Camping's Avatar
 
Join Date: Mar 2013
Location: Arkansas
Posts: 690
My Dometic brisk air 15k was three years old on last warranty replacement. But with so many, maybe they have stopped the good will replacement. They did tell me "this is the last one" when they honoured it.
__________________
Nights camped 2015...20
Nights camped 2016...20
Nights camped 2017...24
2017 Ram 2500
2014 Salem 32BHDS
Ida Ratherbe Camping is offline   Reply With Quote
Old 05-18-2017, 02:59 PM   #12
Senior Member
 
Iwannacamp's Avatar
 
Join Date: Aug 2013
Posts: 7,855
Quote:
Originally Posted by Ida Ratherbe Camping View Post
My Dometic brisk air 15k was three years old on last warranty replacement. But with so many, maybe they have stopped the good will replacement. They did tell me "this is the last one" when they honoured it.


That's petty good. Warranty is limited to a number of times? Crazy.
__________________
2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
born in Texas.... live in Arkansas
Iwannacamp is offline   Reply With Quote
Old 05-18-2017, 03:48 PM   #13
Senior Member
 
Join Date: Nov 2015
Location: Carlyss, Louisiana
Posts: 470
I suffered through the same issues last year in northern Texas. Outside air temperature when I stopped for the day was 104 degrees, inside temp was 99 degrees. Turned 15K unit on and it ran constantly for six hours before shutting off. I now have two 15K units, one ducted and one not. Heading out to Corpus Christi, Tx next week, will see how much at additional unit helps with the cooling. I like your ideal and am having thoughts of building one of those ducts myself.
Walholler is offline   Reply With Quote
Old 05-18-2017, 03:52 PM   #14
Senior Member
 
A32Deuce's Avatar
 
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,215
Sounds like something worth trying. One thing I fund with the ducting that helps, blocking off the duct after the last ceiling vent. No sense cooling where there is no vent.
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
A32Deuce is offline   Reply With Quote
Old 05-19-2017, 08:00 AM   #15
Senior Member
 
Thurman's Avatar
 
Join Date: Aug 2011
Location: Albany, GA.
Posts: 1,282
"A32Deuce": That is one of the problems I found in my TT. Each end of the ducting was open allowing cooled air to go into the attic area. Another problem was where each of the LED light fixtures were mounted into the ceiling. When I removed the light fixture from the ceiling I found a gap all around the diameter of the light fixture between the hole in the ceiling and the hole of the duct work. I also found this problem with each of the registers in the ceiling. I used a short piece of pipe insulation and wedged it into place at each end of the ducting. I used foil tape to seal all around the lighting fixtures and registers to make the cooled air come into the TT instead of cooling the attic area. One other problem I found was with the baffle built into the Dometic 15K A/C unit behind/above the ceiling grill. I could stick my little finger into the gap all around the baffle. That was allowing the ambient air and the cooled air to mix behind the A/C ceiling grill. Foil tape all around that area.
Thurman is offline   Reply With Quote
Old 05-19-2017, 09:02 AM   #16
Senior Member
 
A32Deuce's Avatar
 
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,215
All my lights are only down the center. How I found the open ends was after reading about all the trash in them, I vacuumed them out. A lot more air flow with the ends blocked!
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
A32Deuce is offline   Reply With Quote
Old 05-20-2017, 07:24 AM   #17
Senior Member
 
DouglasReid's Avatar
 
Join Date: Jun 2016
Location: Maurice, LA
Posts: 3,337
Quote:
Originally Posted by Ida Ratherbe Camping View Post
Just some info for ya. Our TT was purchased in 2013. The first ac went out on first trip, replaced under warranty.

Fast forward to June of last year, ac started icing and not cooling. Dometic had a rash of bad 15k units, I convinced dealer to contact Dometic for warranty work due to track record. Dometic replaced unit and I requested upgrade to Penguin 15k if I paid difference.

Long story short, contact dealer and see if they, Dometic, will cover.
EXCELLENT Advice! Only one add, if the first dealer won't do it, go to another one until you find one that will help you. Then you know who to go to when you have other issues whether covered by warranty or not.
__________________
2012 Wildcat Sterling 32RL, Gladiator Qr35 ST235/85R16 Load rating G, TST 507 TPMS w/ Flow-thru Sensors & Repeater, Reese Sidewinder 16K Pin Box, PI EMS HW50C
2008 Chevy Silverado 2500HD CCSB LTZ Diesel, Fumoto Oil Drain Valve, Turbo Brake activated, 39 gal Aux Tank W/ Fuel Pump transfer, Air Lift Loadlifter 5000 air bags.
DouglasReid is offline   Reply With Quote
Old 05-24-2017, 10:50 AM   #18
Senior Member
 
Join Date: May 2013
Location: South Dakota
Posts: 162
The Dometic Blizzard NXT is the latest and greatest model as of recent, has anyone had this model installed?
You are being redirected...
__________________
Coachman Freedom Express 320BHDS
Super 8 is offline   Reply With Quote
Reply

Tags
dometic

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 05:14 PM.