blender valve

[mikegas]

hi ive got a thermal store combination cylinder that runs on economy 7, customer says they are only getting half a bath of hot water then it runs cold, bottom immersion has just been replaced. My question is can a blender valve cause this fault or would you get no hot at all if the valve was at fault?

 

[plumberdarren]

Is the blender valve on the hot tap of the bath with just a mixed water feed from the valve to that tap ?

 

[mikegas]

its on the hot straight off the cylinder

 

[Dannypipe]

Is it a Gledhill Pulsacoil BP model? If yes, then blending valve will affect the temp.

 

[Dannypipe]

Or else it could be a dodgy stat in the lower immersion, or a fault on the PCB. If its a Gledhill A class I will know what the problem is there too.

I service and repair thermal stores reguarly and will help where I can.

 

[mikegas]

Is it a Gledhill Pulsacoil BP model? If yes, then blending valve will affect the temp.

yes looks like this one

 

[Dannypipe]

The BP model is the latest one. The blender valve has a green knob. On a unit I fitted recently, the blender valve needed adjusting. Factory setting is something like 2 turns back from fully closed. I set them a bit hotter than they do in the factory.

Also I have known them to 'stick' and have fixed them simply by rotaing the head a few times and trying again.

Hope this helps...

 

[mikegas]

will the fact they are getting half a bath of hot water at a good temp not rule out temp setting though?

 

[Dannypipe]

I did think that, and it would be more likely that they would just have tepid hot water or none at all. That is why I mentioned the A Class model...it can still give problems after changing the immersion heaters, and has a common fault with its relays. The problem is the A class doesn't have a blending valve.

The fact that they're getting half a bath of water makes me think that its probably a problem with the lower immersion heater. The booster heater is probably the only one that's working.

Would help if I knew what model it was.

 

[mikegas]

yeah looks like ev points to bottom immersion, im thinkin the replacement may be the wrong size, i'll have to remove it and see. thanks for your help

 

[mikegas]

Found out stats should be set at 80 for this cylinder so turned stat up, also the amount of hw they was getting was very hot checked the blender an it was open full so turned it down a bit. Hoping this cures it

 

[Dannypipe]

Yeah, they're funny things thermal stores. The stored water is the primary water and not what the user actually uses for DHW.

They heat the incoming main via a flat heat exchanger on some models and on the BP model (with a blending valve) it uses a coil, but in reverse if that makes sense!?

The stats that they provide don't have a thermal cut out, though I have fitted standard stats in their place and just turned them right up, only ever had one get too hot and cut out. With that one I fitted a proper factory set rod stat...cost me £50. For a rod stat! Criminal.

Anyway, I'll keep my fingers crossed for you Mike.