low pressure function is now high pressure

[Jimmy Buffett]

The presoak function in one of my bays is now coming out high pressure. The rest of the bays are still low pressure. It's Jim Coleman equipment. What can cause it to switch on it's own?
Thanks
J

 

[mjc3333]

It has to be the solenoid that "dumps" the pressure down to 400 psi when you are on pre soak. If that solenoid fails, the bay would act as if it was on a high pressure function. Could also be a voltage problem to the solenoid. Or even something crossed in the selection switch in the bay.

 

[Jimmy Buffett]

The tire cleaner still comes out low pressure and so does the sfr. If it was the solenoid wouldn't everything be high pressure?
Thanks

 

[mjc3333]

Is your pre soak low pressure under 100 psi from a separate pump (Flo jet etc.), or does it come from the high pressure pump at a medium pressure say 400 500 psi?

You mentioned a JC setup. Most of them were setup to have the pre soak pumped through the high pressure pump with a "dump" solenoid to take down the pressure to 400 or 500 psi.

If you have a separate pump for pre soak (Flo Jet etc.), the high pressure is feeding back through the low pressure pre soak line (check valve problem). If this is the case, the line should burst by now. Most low pressure lines can handle 250 psi max.

 

[Jimmy Buffett]

It all comes from the hp pump.

 

[mjc3333]

Do you have seperate solinoids for each function at the pump?

What pressure do you run the pre soak at?
Pressure of tire cleaner?
Pressure of SFR?

 

[mjc3333]

Is your system a multi pressure or is it a VFD system?

 

[Jimmy Buffett]

Is your system a multi pressure or is it a VFD system?

Well I'm not sure what this means...


Presoak is normally 400lbs sfr 200 and tire cleaner 200 (tire cleaner has air infused).

 

[mjc3333]

PM your e/mail or phone number, I may be better able to talk you through this

Mike C.

 

[Greg Pack]

Jimmy, typical JCC presoak setup is called medium pressure. The pressure is controlled by the solenoid that it to the left of the bay pump. behind it is an adjustable regulator. When the customer selects presoak it energizes the solenoid and allows the lower pressure regulator to "take over". Either the solenoid is stuck closed, or the regulator is malfunctioning (or someone has monkeyed with the pressure). Try tapping both with a hammer and see what happens.