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Old 10-04-2014, 11:13 AM   #131
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Quote:
Originally Posted by grc View Post
Here is a quote from a Dometic Service Manual for the new 8 series, RM8xxx.
This manual looks to be from 2007-10 as shown on page 1 of the pdf file, so this could be before Climate Class was started.

The quote below using the word "identical" is from page 19 of the pdf file of this Dometic manual.

"On the back side of the 8-series fridges the same components are used as with the 7xxx-Generation. Cooling unit, Gas Valve GV 100, burner control device P810, burner and heating elements are identical."

http://web.adria.dk/wp-content/uploa...ice-RM8XXX.pdf
Great info in the manual! Thanks!
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Old 10-04-2014, 11:17 AM   #132
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Originally Posted by escape artist View Post
Hi: Klem... Before I set it to 3 bars it ran on 2 for a while and warmed up to 0*C. If it's warming up that should indicate it's not running continuously... I'd think. More fine tuning in the am. Alf
escape artist N.S. of Lake Erie
Put an ear by the lower refer vent and you should hear the burner when it's 'on'. And/or open the vent and you'll see a flame peep hole.

Careful ... you don't want to burn up the burner
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Old 10-04-2014, 11:31 AM   #133
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Originally Posted by cpaharley2008 View Post
Reading all these attachments and references to Dometic and it's subsidiaries to find the correct information reminds me a lot of doing this while I was employed and working. This is the type of stuff I had to look for and hunt for in trying to follow the money, now we are trying to follow Dometic's refer build specifics.....I need a day off
Just when you wanted a day off ... here is a 'fun' research project.

In my words - can you please check and report back in your 'spare time'?
I read the recall and it appears that in 1996ish they raised the power on the burner. By 2005ish they acknowledged that there were some fires in refrigeration units from 'unknown' source(s).They 1st said the source was burning insulation added by installers.
They hired independent research that found the burners on some units had cracked and the leaking refrigerant had ignited. They acknowledged that is was fire hazard and initiated the recall to install a protector on the burner units identified as having the problem.

?? Could this be the reason that our refrigerators are wimpy compared to the ones we had in the past? It would make sense that they lowered the burner heat and/or raised the thickness of metals to make sure there was no more fire issues?? That would result in decreased cooling performance.

It seems we can tweak small gains out the 6.7 by moving the thermistor etc. but are we moving the heat in the burner up into the danger zone they may be trying to avoid

Mel
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Old 10-04-2014, 11:58 AM   #134
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Quote:
Originally Posted by cpaharley2008 View Post
Reading all these attachments and references to Dometic and it's subsidiaries to find the correct information reminds me a lot of doing this while I was employed and working. This is the type of stuff I had to look for and hunt for in trying to follow the money, now we are trying to follow Dometic's refer build specifics.....I need a day off
Hi: cpaharley2008... Kinda like a "Forensic audit"... Just as long as we're not flogging a "Dead fridge". The performance is much colder and not on max at all times. Now I need to check if the 120V. heater is cycling on/off properly. I am hopeful. Alf
escape artist N.S. of Lake Erie
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Old 10-04-2014, 12:20 PM   #135
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Originally Posted by Klem View Post
Just when you wanted a day off ... here is a 'fun' research project.

In my words - can you please check and report back in your 'spare time'?
I read the recall and it appears that in 1996ish they raised the power on the burner. By 2005ish they acknowledged that there were some fires in refrigeration units from 'unknown' source(s).They 1st said the source was burning insulation added by installers.
They hired independent research that found the burners on some units had cracked and the leaking refrigerant had ignited. They acknowledged that is was fire hazard and initiated the recall to install a protector on the burner units identified as having the problem.

?? Could this be the reason that our refrigerators are wimpy compared to the ones we had in the past? It would make sense that they lowered the burner heat and/or raised the thickness of metals to make sure there was no more fire issues?? That would result in decreased cooling performance.

It seems we can tweak small gains out the 6.7 by moving the thermistor etc. but are we moving the heat in the burner up into the danger zone they may be trying to avoid

Mel
Mel, I don't believe so. The "wimpy" performance is also seen on AC. I believe a big part of the performance issue is related to poor insulation.
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Old 10-04-2014, 12:26 PM   #136
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Originally Posted by hotfishtacos View Post
Mel, I don't believe so. The "wimpy" performance is also seen on AC.
Woodalls Open Roads Forum: Dometic Refer Recall - Possible Fire Hazard -Update 2/13/07

In April of 1997 Dometic modified the design of the affected refrigerators by increasing the wattage of the heating element from 325 watts to 354 watts. All production of the affected units from April 1997 through May of 2003 utilized the 354 watt heating element. In May of 2003, in order to improve the operating life of the refrigerators, Dometic returned to the use of the 325 watt heating element which it continues to use today. It is now believed that the use of the higher wattage heater contributed to abnormal fatigue in the boiler tube.
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Old 10-04-2014, 12:35 PM   #137
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Originally Posted by hotfishtacos View Post
Mel, I don't believe so. The "wimpy" performance is also seen on AC. I believe a big part of the performance issue is related to poor insulation.
I agree with Steve.

The performance is 'wimpy', but the fridge is SN climate rated, and is designed to use less energy. It's even one of the bullet points on the fridge features on their website. It uses less AC than fridges with a climate class for hot climates.

At the end of the day we're still talking about making an SN class fridge perform like a T or ST. Good luck with that.
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Old 10-04-2014, 01:19 PM   #138
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The root cause of the cooling issue is complex and debatable but I'm sure we all agree that they are, "wimpy", the best descriptive term I've heard so far!
..
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Old 10-04-2014, 03:32 PM   #139
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Originally Posted by Klem View Post
The burner needs a rest or the system doesn't complete the normal cycle...
I don't get that - the absorption refrigeration cycle is continuous, not a batch process, right?
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Old 10-04-2014, 04:46 PM   #140
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I don't get that - the absorption refrigeration cycle is continuous, not a batch process, right?
Good point. There are basically two types - continuous cycle and intermittent cycle. Not sure which one the Dometic is. Here's a pretty good explanation of the differences:

SMALL AMMONIA REFRIGERATOR
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