Thread Number: 81068  /  Tag: Vintage Dishwashers
Hobart WM-5H water supply pressure 		[Down to Last]

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Post# 1050704   11/11/2019 at 14:41 (1,621 days old) by HobartGreg (Canada)        

In the process of hooking up a late 1980s Hobart WM5H, and the installation instructions are VERY specific about keeping the inlet pressure on the fill line below 25 p.s.i. Can anybody tell me why? The fill line looks to have the solenoid on it, and then an adjustable valve to control flow into the booster tank. Would it seem reasonable to adjust the manual valve into the booster to keep the fill cycle from overfilling instead? Or am I missing something else? I'm on a municipal water supply that is probably around 65 p.s.i.
Thoughts appreciated, thanks!
Greg.

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Post# 1050731 , Reply# 1   11/11/2019 at 17:50 (1,621 days old) by toploader55 (Massachusetts Sand Bar, Cape Cod)        

toploader55's profile picture
My guess would be overfilling ? It is easy to just add to the inlet line a Pressure reducing valve.

Most commercial machines have one installed.

www.grainger.com/category...

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Post# 1050737 , Reply# 2   11/11/2019 at 18:46 (1,621 days old) by stevet (West Melbourne, FL)        
"take 2 aspirin and call me in the morning."

 If the doctor tells you this, would you take 6 aspirins and not expect some sort of negative result?

Basically, the 20-25psi spec provides the proper amount of rinse water required by NSF to sanitize your dishes. The spec also helps to insure that the machine does not overfill and spill out the door before the overflow can drain the excess out of the tub. Next, with 65 psi, you will push water through the booster tank too fast and will cause the tank to lose temp faster than normal. And you also have to be careful because water can come out of the fill air gap and leak on to the floor under the machine.

As shown in your picture, there is no pressure limiting device on your water line. The petcock shown on the right is to facilitate draining the booster if the element or thermostat need to be replaced.

Ed hit the nail on the head. A pressure reducing valve would be an excellent idea to have on the supply line. If you want one, I have one as shown in the pictures. Email me and I can ship you one.



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Post# 1050742 , Reply# 3   11/11/2019 at 19:09 (1,621 days old) by HobartGreg (Canada)        

Excellent points about fill level, leaks and booster temp recovery, thank you both! I'll see if I can source a valve nearby.
Cheers,
Greg.


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