Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 23-04-2017, 17:45   #1
rlg
Registered User

Join Date: Aug 2012
Posts: 74
ab CU-100 refrigeration unit trouble

I have a 4 year old ab CU 100 unit that is not cycling properly. The led gives the code for low voltage, 1 blink but I can get the compressor to come back on if I play around with the junction box and/or power wires. Sometimes the LED is not very bright. Of course I reconnected the power leads several times, they seem fine, but the problem feels like it is inside the junction box.
The leads are getting proper voltage and the batteries are strong.
Sometimes it will run for days without problem, sometimes hours. It does not make a difference if Im plugged in to shorepower or on the hook.

Can I replace the junction box?

When I first noticed it, the fan had stopped working but compressor was running. I believe it wasnt running long without the fan, a couple hours maybe. I cant be certain though. I replaced the fan with a spare I had, which now comes on and off fine with the compressor when the compressor is working normally. When it doesnt, and I get the dull blink, the fan will come on right away when I wiggle the connections and junction box, but the compressor takes more finesse to get to come back on.

Easy one right guys?

Thanks in advance!
__________________

rlg is offline   Reply With Quote
Old 24-04-2017, 05:51   #2
Registered User

Join Date: Nov 2015
Posts: 1,091
Re: ab CU-100 refrigeration unit trouble

Sounds like a possible resistance issue in the wiring. Have you run tests on each cable in the circuit?
__________________

__________________
Keth

Boat Vinyl Lettering and Graphics
Bleemus is online now   Reply With Quote
Old 24-04-2017, 06:25   #3
rlg
Registered User

Join Date: Aug 2012
Posts: 74
Re: ab CU-100 refrigeration unit trouble

Update

I received some info from resident expert Richard Kollman which will help me solve the problem. Apparently the fault lies in the junction box itself, an add on by Dometic who makes the unit. I will rewire the thermostat, power, ground, and fan directly to the controller as per Danfoss standards.

Thank you Mr. Kollman.

I will report back later with results.

Rob
rlg is offline   Reply With Quote
Old 24-04-2017, 06:56   #4
Registered User

Join Date: Nov 2015
Posts: 1,091
Re: ab CU-100 refrigeration unit trouble

You are in good hands with Mr Kollman.
__________________
Keth

Boat Vinyl Lettering and Graphics
Bleemus is online now   Reply With Quote
Old 24-04-2017, 09:25   #5
rlg
Registered User

Join Date: Aug 2012
Posts: 74
Re: ab CU-100 refrigeration unit trouble

You are right Bleemus!

Thank you Richard Kollman, all is working well now. The board has a mark like in your tech tips article 1, mine was on the ground circuit.

I tremendously appreciate your expertise and generosity sir! Thank you very much.

Regards, Rob
rlg is offline   Reply With Quote
Old 24-02-2018, 07:29   #6
Registered User

Join Date: May 2008
Posts: 439
Re: ab CU-100 refrigeration unit trouble

I too have a C100 unit. Thermostat quit holding proper temp. Clicked in the knob at different places in the setting but was not reliable. I have a thermometer inside the box that reports to the unit on the wall to monitor temp.
Replace the thermostat and this one has no click at all in any setting and runs the box down to 31 without shutting off. Tried both ends of the knob sweep.
Is there a trick to installing the thermostat wire? It's in the same place as the old one and into the tube along the 11" x 18" cold plate.
Thanks for any knowledge!!
Attached Thumbnails
Click image for larger version

Name:	Box.jpg
Views:	29
Size:	404.3 KB
ID:	164725  
Flyingriki is offline   Reply With Quote
Old 24-02-2018, 13:15   #7
Marine Service Provider

Join Date: Aug 2004
Location: Ft. Lauderdale
Posts: 1,113
Re: ab CU-100 refrigeration unit trouble

Flyingriki, It does appear to be an Adler Barber power plate evaporator. If thermostat in picture is the new one it does not look like the type used by AB.

If I understand correctly the new thermostat no mater where it is set keeps compressor running all the time. Are you sure this thermostat is for refrigerator and not for a freezer?

Set the thermostat knob all the way counter clockwise. Then slide thermostats temperature sense tube and not the thermometer prob as for into the power plate tube as possible. After these changes compressor should stop running in less than 30 minutes. If compressor does stop turn knob slowly to the right (Clockwise) till compressor starts running again.

If it is possible to start and stop compressor now with this thermostat it may be possible to use it to control your desired box temperature.
Richard Kollmann is offline   Reply With Quote
Old 24-02-2018, 15:52   #8
Registered User

Join Date: May 2008
Posts: 439
Re: ab CU-100 refrigeration unit trouble

The thermostat is at the opposite side of box so I've stretched the sensor at far as I can behind the plate and down the side into the tube about 2" or so. Can't get any more. Nothing stops the unit manually. No click in the knob at any position. Sometimes I hear it go off but goes back on shortly after, temps vary when this happens. I specified the need for a plate thermostat for refrigeration only......not sure what I got yet. Will know more Monday.
C200 unit, by the way.
__________________

Flyingriki is offline   Reply With Quote
Reply

Tags
refrigeration

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
For Sale: Benmar Power unit, course keeper 210 binnacle and raytheon Radar unit Bryan Hendrix Classifieds Archive 5 21-12-2013 15:53
For Sale: Harken MK3 unit ONE roller furling unit megayachtec Classifieds Archive 3 23-06-2012 22:45
For Sale: Drop-in 12vdc Refrigeration Unit aboutgone Classifieds Archive 3 18-11-2011 15:28
Replacing Refrigeration Unit Ehumpal Plumbing Systems and Fixtures 6 30-01-2007 22:34
Which Refrigeration Unit to Buy? Nepenthe Plumbing Systems and Fixtures 10 09-12-2006 19:33



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:05.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.