JJBIRISH wrote:
T
Chris that is a great idea but it seems to restore operation when the temps cool, even though the condition causing the overheating hasn’t been corrected… I presume that is why the recall fixes prefer to put the unit into lockout… in short the out of level condition the caused the shutdown should not restore the power until the problem has been corrected…
All the unit in the website does is allow continued use when a dangerous condition exist…
It shuts down far before the recall kits would- they are designed to keep the unit from catching fire, the ARP is designed to keep the unit from being damaged. It does finally go in to complete lockout after (I believe) 8 attempts. Given the 20 minute delay, along with the time to reach an overheated boiler, you're talking at least 5 hours, most likely longer. The ARP is designed to eliminate the gradual degradation you get with an hour here and there running off level, and really goes to the heart of the reason for being level- the only thing that matters is circulation of the ammonia. You can be off level and if the ammonia is still circulating, no damage will occur- you could be level and get a "vapor lock" in the unit, stopping circulation (this happens fairly often).
One of the failure modes that I had never considered is that when overheated, the anti-corrosive sodium chromate gives off nitrogen. This raises the pressure in the unit a bit, and displaces some of the hydrogen at the bottom of the high temperature evaporator. This leads to units where the freezer works well, but the lower portion doesn't cool well.