Power Max Thermal Store, low flow rate and intermitent HW

[AshaDPlumber]

Customer rang today about this, my first thought was heat exchanger. I was in the area so went round on route home. After spending ten mins trying to figure this thing out, came to one of three things.
Exchanger, flow switch, pump. It's a strange set up so just seeing if any of you guys had come accross one. Less than 5yr old.

Power max 155xss

GC. 41-389-13

 

[WDIK]

clever idea
primary water heats thermal store till its at temp.
flow switch makes when mains tap opens, brings pump in pumping stored secondary to one side of a plate exchanger, mains through other side over 95% transfer and it keep going till the store goes cold.

hot water at mains pressure.

so what was doing what? what temp was the store at?

 

[AshaDPlumber]

Scalding hot at the tap for few minutes then cold. Pump doesn't appear to run. I thought that it might be as simple as the flow switch, but it was 5:30 so didn't want to start fiddling to much. But do you think it might be that the exchanger is scaled up and cant get the circulation it needs to activate the flow switch so not starting the pump

 

[WDIK]

about right the water in the plate was static so that heat transfered, the the plate went cold.

flow switch not activating or the pump has failed. could be due to scale as the flow to the tap should be good.

 

[AshaDPlumber]

Cheers boss, your a star.

 

[baxpoti]

Check the blending valve part No.P757

 

[WDIK]

isnt that on the primary?

 

[superdupergasman]

There is also a flow resrictor in them that is really bad for blocking up.

 

[WDIK]

Ive never work on one or even seen one, because im a comercial engineer.
having worked on many stokvis plate units where the heat input will outstrip demand many times over. i see these as what they are.

very simple in operation but an ingenious creation.
basic premise you can store energy and release it from its stored state at a faster rate that the primary heat source could ever produce it

 

[AshaDPlumber]

Cheers guys, that gives me plenty to get on with.