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Go Back   SailNet Community > On Board > Gear & Maintenance > Adler Barbour CU-100 short cycling
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Thread: Adler Barbour CU-100 short cycling Reply to Thread
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Topic Review (Newest First)
07-04-2013 07:02 PM
SchockT
Re: Adler Barbour CU-100 short cycling

bshock,

Have you resolved your problem, or learned anything new about it?
07-02-2013 05:47 PM
deniseO30
Re: Adler Barbour CU-100 short cycling

It just takes longer for the 134 to get up to operating pressures in auto air. mostly the retro fitted ones.
07-02-2013 02:59 PM
SchockT
Re: Adler Barbour CU-100 short cycling

Quote:
Originally Posted by deniseO30 View Post
Really small units are really really difficult to charge by gauges Schock, just the hoses hold almost the same amount as the unit LOL Think it's an ounce per ft, if i remember right
That's exactly why I DON'T like to charge by weight in small systems. The refrigerant in your gauges, and even the weight of your hoses themselves can affect the scale! Instead I charge the system, let it pull down with an empty box, and then adjust the charge so I have around 5-10 degrees of superheat at minimum load. It's the way the old fridge guru I apprenticed under taught me, and it has served me well.

Quote:
Point is, with 134 and refrigeration systems like these. They will get cold/freeze.. until later. much later. It takes quite some time for the pressures to stabilize when the little compressor is running if it's over charged. the discharge pressure will rise.. slow, very slowly. But yes, Schock, we all do it R-12 and other CFC freons still react faster then compounds like 134. I don't like it.. but it's here to stay

I still run R-12 in my old car it's great. It's weird sitting in a newer car or truck and waiting for the 134 to start cooling
I've never noticed any difference in "behavior" between R-134a and R-12. The 134a is about 10% more efficient, but they still change states and do their job in exactly the same way. I don't know what you mean by "react faster"?
07-02-2013 11:09 AM
deniseO30
Re: Adler Barbour CU-100 short cycling

Really small units are really really difficult to charge by gauges Schock, just the hoses hold almost the same amount as the unit LOL Think it's an ounce per ft, if i remember right

My own home side by side called for I think it was 6 ozs of 134 when we replaced the compressor, after weighing in the right amount; I said "eh, it's not, right add some more" it's great except when the ac is off in the house and the kitchen gets really warm from summer heat and the head pressure climbs, and the inside temp struggles with ice cream

Point is, with 134 and refrigeration systems like these. They will get cold/freeze.. until later. much later. It takes quite some time for the pressures to stabilize when the little compressor is running if it's over charged. the discharge pressure will rise.. slow, very slowly. But yes, Schock, we all do it R-12 and other CFC freons still react faster then compounds like 134. I don't like it.. but it's here to stay

I still run R-12 in my old car it's great. It's weird sitting in a newer car or truck and waiting for the 134 to start cooling
07-02-2013 08:33 AM
MARC2012
Re: Adler Barbour CU-100 short cycling

Mine will short cycle to fuses become arched & corroded.
07-02-2013 05:30 AM
ebs001
Re: Adler Barbour CU-100 short cycling

Quote:
Originally Posted by deniseO30 View Post
I don't know that you would have any warranty with a 13 year old boat/system. The compressor may have the control module that has led lights that blink codes. The older ones didn't. Allot of people over charge the refrigerant into these little units too and that also causes problems with the module's sensitivity to amperage.
I didn't mean to imply that this might be a warranty issue but rather it was a suggestion as way of getting a qualified technician to handle his problem. I think that in this case the best advice is to get a qualified person.
07-01-2013 11:37 PM
SchockT
Re: Adler Barbour CU-100 short cycling

Denise has covered the basics. Look at the voltage, and the wiring first, then the thermostat. If it worked fine and got cold when the compressor ran continuously then it is likely the refrigerant charge is fine. I doubt very much you have to replace the compressor, although if the electronic module is faulty it is possible. If your compressor module has a diagnostic LED, count the flashes and see what it is telling you.

One statement I will disagree with is
Quote:
Do you know how to handle refrigerant evac and replacement in very small units?" (only one answer; "weigh it in ounces"
A refrigeration tech that REALLY knows what he is doing might charge the system based on suction temp and pressure. In some cases the "factory charge" may not be available, or it may not be accurate because the system line set has been modified.
07-01-2013 09:35 PM
deniseO30
Re: Adler Barbour CU-100 short cycling

I don't know that you would have any warranty with a 13 year old boat/system. The compressor may have the control module that has led lights that blink codes. The older ones didn't. Allot of people over charge the refrigerant into these little units too and that also causes problems with the module's sensitivity to amperage.
07-01-2013 08:40 PM
bshock
Re: Adler Barbour CU-100 short cycling

Thanks guys, I have a call into the service tech to determine what exactly he did; then I'll call Adler Barbour as you recommend. When I spoke to him after his initial service call, I'm pretty sure he said he DID NOT add freon though. But I'll confirm.

Thanks again!
07-01-2013 09:40 AM
ebs001
Re: Adler Barbour CU-100 short cycling

In the installation manual here https://www.dometic.com/39a242ab-622...76f8ec05.fodoc they recommend contacting the factory for most trouble shooting. You can explain the problem and they will recommend a solution.

For their warranty work their referred option: Have a Dometic authorized Servicing Dealer, perform the work needed. The customer needs to call
Dometic Customer Service Department for a recommendation as to the closest dealer. If the customer already knows
an authorized servicing dealer, the dealer should be contacted directly.

I would still contact the person who has previously looked at your refer unit and ask what he did to get it to work. The more information you are able to provide Alder Barbour and there technician the better. I would be reluctant to use him though because I find it strange that someone can say they don't know what's causing a problem but here's the solution.
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