Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-29-2016, 09:26 AM   #1
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
HVAC Dometic

Turned AC on for first time in several months and it doing following:

Set up normal settings, 72 deg and below. Unit comes on and runs about one minute, brings vent temp down to 78 deg's, cuts off for about 2 minutes and repeats cycle. Took hood off and all looks normal--clean etc.

Low gas? (don't know what to call it). Any ideas with such limited info? As always, any help will be greatly appreciated. Thank you in advance.
__________________

__________________
mocus is offline   Reply With Quote
Old 07-29-2016, 10:07 AM   #2
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,625
Images: 12
What was the inside temperature of the trailer when you turned it on.

With very high inside temperature I have had the same issue. If the AC sees very high head pressure, heavy load noted above, it may shut off on high head pressure. If this happens again try spraying water on the condenser when the AC comes on. That will lower the head pressure. Depending on how hot the trailer is you may have to do this for several minutes.

This works for older AC that had better controls but may also help here.
__________________

__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-29-2016, 10:58 AM   #3
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
Quote:
Originally Posted by HowieE View Post
What was the inside temperature of the trailer when you turned it on.

With very high inside temperature I have had the same issue. If the AC sees very high head pressure, heavy load noted above, it may shut off on high head pressure. If this happens again try spraying water on the condenser when the AC comes on. That will lower the head pressure. Depending on how hot the trailer is you may have to do this for several minutes.

This works for older AC that had better controls but may also help here.
Trailer sets under a carport, covered by tree (all shade). Temp probably 80deg. She doesn't get up above that at home. I felt copper tubing on top while unit running and all touchable (none cold). Unit runs about minute, off about minute, and repeats cycle. I believe(?) at least one line should be cold but not sure
Will give your suggestion. Thank you.
__________________
mocus is offline   Reply With Quote
Old 07-29-2016, 11:24 AM   #4
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,625
Images: 12
Well if it is not abnormal high load causing the problem it may be low gas and the compressor is heating up from lack of cooling from the returning refrigerant.

Try setting the thermostat as low as it will go and see if the AC will remain on longer. If it remains on for more than 5 min. take the temperatures at the return and supply grills. You should see about 18 degrees difference. If it will run longer and supply cool air the problem may be the thermostat.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-29-2016, 01:09 PM   #5
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,045
Quote:
Originally Posted by mocus View Post
Turned AC on for first time in several months and it doing following:

Set up normal settings, 72 deg and below. Unit comes on and runs about one minute, brings vent temp down to 78 deg's, cuts off for about 2 minutes and repeats cycle. Took hood off and all looks normal--clean etc.

Low gas? (don't know what to call it). Any ideas with such limited info? As always, any help will be greatly appreciated. Thank you in advance.
Could be any number of things but the most typical cause is some obstruction that keeps air from reaching the outside coils. Leaves, dirt, fan not actually turning or loose on the shaft, etc.
__________________
To learn to see below the surface, you must adjust your altitude
Jammer is offline   Reply With Quote
Old 07-29-2016, 01:33 PM   #6
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
Quote:
Originally Posted by Jammer View Post
Could be any number of things but the most typical cause is some obstruction that keeps air from reaching the outside coils. Leaves, dirt, fan not actually turning or loose on the shaft, etc.
Thanks both of ya, unit working now. There was nothing blocking in the roof unit when I removed cap. However, that is when unit started working, and I cleaned things off a bit. Reading other post today re HVAC's answered some questions.
Thanks again.........
__________________
mocus is offline   Reply With Quote
Old 07-29-2016, 01:47 PM   #7
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,625
Images: 12
Quote:
Originally Posted by mocus View Post
Thanks both of ya, unit working now. There was nothing blocking in the roof unit when I removed cap. However, that is when unit started working, and I cleaned things off a bit. Reading other post today re HVAC's answered some questions.
Thanks again.........
That is very odd. Removing the cap completely eliminates air flow over the condenser. Look at the gasket configuration under the cap and you will see what I mean.

Has that unit run in very dusty locations? If so the condenser coils may be clogged on the face side and removing the cap allowed the back side of the coils to give off heat simply by convection.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-30-2016, 07:19 AM   #8
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
Quote:
Originally Posted by HowieE View Post
That is very odd. Removing the cap completely eliminates air flow over the condenser. Look at the gasket configuration under the cap and you will see what I mean.

Has that unit run in very dusty locations? If so the condenser coils may be clogged on the face side and removing the cap allowed the back side of the coils to give off heat simply by convection.
I see what you mean...never new what the foam channeling was! Have completely cleaned...wasn't dirty at all nor anything clogged. Unit working great now (fingers crossed). I'll give the first 2 gentlemen credit for getting me started. Only thing, is this fix temporary? Would hated to for this to have happened while on a trip. Unit hasn't been anywhere there was dust..yet.

Attempting to install loveseat recliner today. That stock leather couch is worthless. Will keep couch in case ever resale. You guys are great!
__________________
mocus is offline   Reply With Quote
Old 07-30-2016, 07:23 AM   #9
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
I see what you mean...never knew what the foam channeling was! Have completely cleaned...wasn't dirty at all nor anything clogged. Unit working great now (fingers crossed). I'll give the first 2 gentlemen credit for getting me started. Only thing, is this fix temporary? Would hated to for this to have happened while on a trip. Unit hasn't been anywhere there was dust..yet.

Attempting to install loveseat recliner today. That stock leather couch is worthless. Will keep couch in case ever resale. You guys are great![/QUOTE]
__________________
mocus is offline   Reply With Quote
Old 07-30-2016, 07:26 AM   #10
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
Whooooops
__________________
mocus is offline   Reply With Quote
Old 07-31-2016, 01:35 PM   #11
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 338
HVAC unit running great for 15 minutes then throws the 20amp breaker in house power panel. Still have the hood off of unit, but still under carport. Could by not having hood covering in place cause unit to run too hot in a short time and throw breaker??? Nothing else turned on.
__________________

__________________
mocus 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
HVAC thermostat opinions please! AtomicNo13 Electrical - Systems, Generators, Batteries & Solar 8 07-10-2012 04:08 PM
HVAC Experts-Please Help tesstoaster Furnaces, Heaters, Fireplaces & Air Conditioning 1 07-03-2012 07:50 PM
Help an HVAC noobie out... can I combine the furnace and A/C t-stat? Taylormade Furnaces, Heaters, Fireplaces & Air Conditioning 10 05-16-2012 02:13 PM
Generator--HVAC Question Tideair Generators & Solar Power 10 03-14-2012 09:24 PM
Airstream - Free Standing HVAC anglev Winter Living 8 12-04-2011 07:20 AM


Virginia Campgrounds

Reviews provided by



Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:07 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.