are my pumps plumbed OK?

[Dan-Ark]

Replacing 2 of the 3 pumps at the second wash we have acquired. Put it back same as the old failed pump, but not sure this is the best setup? Each pump is fed on both sides of the head. the right hand side is fed by a tank labled Hot water that is fed from a residential water heater. the tank is not insulated and we don't have the gas turned on so there currently is no hot water, but want to plumb it so we can add it when we can. the other side is fed cold water, controlled by a solenoid valve. On the cold side, there are chemical lines for soap and wax that mix prior to being delivered by the HP pump. There is another chemical line on the "hot" water side but now I cant remember what it is, and then Presoak/tire cleaner is delivered by a low pressure pump just before the boom swivel. there is a 'spot free rinse" on the selector knob, but no RO sytem in the equipment room. Plan to add that. I have read advice on here not to plumb to both sides of the head, but not sure how I can do it differently. Including a photo for reference.

 

[MEP001]

One of the plumbing basics is done right - you have the regulator and output to the bay on the same side, and the regulator bypass returned to what appears to be the same port as the incoming water. I've found that if it's not plumbed that way, the water flow is suddenly changing directions every time the trigger is pulled and released and there's a brief cavitation that erodes the manifold.

 

[Dan-Ark]

Thanks, I think your previous comments about the water changing directions is what I was concerned about. this seems to be working. I did add a bunch of non working swivels so I can get back to various parts, head of pump, etc without so much disassembly, it was sort of a puzzle figuring what had to be removed before each fitting could be taken off without those swivels. Hopefully htey wont cause any problems. they do restrict flow a bit.

 

[Dan-Ark]

the check valve on the 'hot water" side that I couldn't remember is for the weep, flowing through the high pressure side of the head of the pump. guess that might add some protection if the heat failed in the ER. Plan to install weepmizers on both washes... soon its almost September already.