Crazy stupid modification or Crazy genius? | TruckMount Forums #1 Carpet Cleaning Forums

Crazy stupid modification or Crazy genius?

Jan 20, 2020
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Benji Zimmerman
So I've got a prochem legend xl with a dodgy thermo relief valve. I was thinking of plugging the inlet on the waste tank for hot water dump/bypass and then installing a replacement inlet of the water box. This way instead of that pesky thermo valve pissing away water needlessly, any overly hot water can join the freshwater tank and average out the temp. I also would most times have freshwater coming in that's cold. What's the downside? Why hasn't it been designed that way to start?
 

SRD

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Nov 6, 2010
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Spencer Dawdy
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Some units are designed that way, they utilize pumps with high temp seals. Only down side to that is if the incoming water temp gets to hot it will blow out your pump seals, might think about getting a bigger water box and plumbing a thermal relief valve from the water box to the waste tank as a safety back up
 

OxiFreshGuy

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Nov 12, 2016
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Yeah - that's honestly the big problem - is it could overheat your pump seals. Imagine this going on all day long or on a big commercial job. Whoops!
 
Jan 20, 2020
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Benji Zimmerman
Yup. I've got the valve apart and sitting in some descaler. Going to put it back together and see if this solves the problem. My supplier here in the city isn't returning calls and I need to be up and running ASAP.
 
Jan 20, 2020
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Benji Zimmerman
So I took it apart and tested it in my kitchen with differing temp of hot and cold water. Seems to work. I'd imagine these things work by the spring heating up a certain temp and thus weakening - causing the valve to open. Correct me if I'm wrong.

Other idea I had, if this valves turns out to be too sensitive is getting a fitting that would extend it away from the water box so that the water that reaches it is a bit cooler than the water inside the box. Obviously this would require some trial and error. The machine should do 190 F.
 

sbsscn

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Sep 17, 2009
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Arm Ben
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So I've got a prochem legend xl with a dodgy thermo relief valve. I was thinking of plugging the inlet on the waste tank for hot water dump/bypass and then installing a replacement inlet of the water box. This way instead of that pesky thermo valve pissing away water needlessly, any overly hot water can join the freshwater tank and average out the temp. I also would most times have freshwater coming in that's cold. What's the downside? Why hasn't it been designed that way to start?


Unless you have high temp seals in your pump then you might need to add a cold mixing valve and a bigger water box. Id keep the temp between 80-90 degrees