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Hobart AM 15VLT
I am trying to adjust the wash temperature and final rinse temperature on this unit. I have checked all elements and the usual troubleshooting measures but the unit will barely reach temperatures 160° wash and 180° rinse and sometimes fall short by a couple degrees. I feel if I could raise the temperature by 10° this would give a buffer. I have changed the prob on booster heater.
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7 Replies
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What is your house supply temp from the hot water heater? When was the last time the booster heater was de-scaled?
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140° incoming water. The booster is cycling as it should before the rinse water is called for (it shuts off) therefore if the unit has not been de-limed and I de-lime it would this have any effect on the rinse temperature?
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The lime can create an insulating effect on the elements and reduce the heat transfer into the water, essentially making it less effecient.
If it’s cycling though, that is probably not your issue unless the issue only arises when it’s running water through.
You can also try a different temp gauge, I’ve had them go bad in the past which led to some misdiagnostics.
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This machine I believe has both hot and cold water supplies. Cold for the steam condenser. But what happens to the boosters, is that they build up a lot of carbonate in the bottom and it displaces the volume of hot water available. The 160F wash is a normal temp, even a bit high. So your tank heater is functioning. !80F is considered the normal sanitizing temp. There is always a short lag in the temp from both the water coming up to the thermometer and the heat transfer delay through the thermometer well. This is normal. If you want to bump the booster up, you’ll have to have a Hobart tech do it. They closely guard the access codes to change anything.
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Thanks I will give it a try and post my results.
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Problem solved. Arrived on site to find temperatures the below normal. Drained the machine and checked the floats, element etc. I filled the machine ran a few cycles and the temperatures were perfect. Fortunately I had another piece of equipment to service. After about one hour I came back to the dishwasher to find the temperatures below normal once again. I ran the unit through a cycle. In the middle of the rinse cycle I lifted the door and found that there was no rinse pressure. What I found was that there is a tank on the back of the AM15 units that supplies the rinse pump with water. This tank was running dry. The rinse pump was unable to produce pressure for the rinse. What was found is that there is a level control probe in this tank. During an initial fill this probe is ignored and the tank overflows filling the wash tank. This gave me a few cycles of proper operation. During a wash cycle this probe maintains water level in this tank. This probe in my case was full of lime. The tank was running dry never re-filling during the wash cycle. I replaced the probe and now I have rinse and wash temperatures and rinse pressure. Done ✅
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Nice, thank you for the detailed update.
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