Question about Hobart 24 in. LXIH-3 Built-in Dishwasher
This Hobart LHiH machine has been in use for >3 yrs. The pressure gauge on the dishwasher reads 7 PSI during the fill and rinse cycle (zero all other times). Per the manual it should be between 15 -25 PSI. The manual also states that the incoming pressure should not be above 25PSI and if it is a regulator should be placed in-line. The incoming line pressure is 45 PSI and no regulator was placed in-line...obviously not to the manual recomendation but that's the way it was. We just placed a regulator in the line and the pressure is not regulated to 25 PSI. A plumber and I tried to troubleshoot the dishwasher and verified that the pressure gauge and main solenoid is working properly. We couldn't understand how backpressure is supposed to be placed on the gauge to allow the pressure to read 25 PSI. What part of the system provides the backpressure? Is it the heater booster? Or some other small oriface in the line? The parts catalog didn't show anything to provide backpressure.
As a side note when the system was operating with no regulator (45 PSI input) the gauge on the dishwasher read 12 PSI. With the 25 PSI regulator it reads 7 PSI. I hope we didn't damage anything due to the high pressure.
Adjust your prv if you screw it in all the way replace it . make sure your new one has a bypass built in
Posted on Dec 07, 2008
Todd - A pressure regulator will REDUCE pressure only. There is no back pressure - the machine's gauge is reading the incoming water pressure as it fills/rinses. Assuming the gauge is OK, the machine is only seeing 7 psi. There is an inline strainer in teh machine, check that for blockage. You said the machine was operating on 45 psi with a reading of only 12 psi. There may be some kind of pressure reducer - I have seen Hobart use special supply hoses with builtin orifices.
hope this helps, if not email me, i service commercial machines and came across your question as I was looking for help myself!
dishwasher in subject line
Posted on Nov 26, 2008
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Posted on Jan 02, 2017
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