Vallient 624 eco plus system boiler

[Crakkers]

Hi

Had this boiler fitted last year. Not the combie but a system boiler attached to the conventional CH and HW system. YOu can now tell I am a novice! - Great through winter.

Now I want hot water and NO CH. My understanding is that I could turn off the CH and have HW only, so when I turn down the CH temp selector on the bioler the HW goes cold. The only way I appear to get hot water is to have the CH temp setting on high(ish) and the water on a similar setting. I have to turn the thermostst down to zero to ensure the rads dont come on. Is this right, or am I missing something????

What I thought I could do is have the CH off / turned down, leave room stst alone and have HW on med / high and have hot water!? But I cant!

Can some one clarify how it should work before i go back to my installer!

instruction book is not clear but suggests that I should be able to turn down the CH to its "summer setting" and stiil have HW. Book also mostly talks about the combi varient.

Any helpers?

PS contacted Vallient direct today - they were not able to help or advise unless I rang their 50p / minute help line!!!!!!!!!!!!!!!!!!!!

 

[Rob]

The HW knob probably has no function. the CH knob is just a boiler stat and not specific to heating.

Leave that set quite high. You should never need to touch this knob.

To turn heating off turn it off on the clock or just turn the room stat right down.

 

[gas4you]

You need to turn the ch off via the programmer, not by turning the boiler stat down.

The top stat that has the tap symbol for HW is not used on this boiler unless you have a unistor cylinder and should be left turned off, fully anti-clockwise.

The ch stat should be set so the display reads 65C.

Your programmer should have heating and HW settings, failing this just turn your room stat fully down to the minimum setting.

The HW cylinder stat should be set to 60C.

 

[spacethegas]

sorry that made me lol genuinely.
but can see why a punter might think that.

 

[bugwoman]

Not sure why that should be so hilarious when those are the instructions (in pictures rather than words, presumably for the international and/or dimwit market) on the inside of the cover, especially when the installer never bothered to hand over a user's manual.

I tried adjusting the CH and HW temps only after finding the programmer unresponsive when I initially tried to switch off the heating in spring. I had lowered the house thermostat to 10 degrees and the CH to "off" on the programmer, but instead of the expected result, got cool bathwater and hot rads. I initially wondered if they had got the wiring right (the installers had told me that they found the programmer "too complicated to get their heads around" and not to fiddle with it!!!), but before being penalised with a hefty callout charge, decided to try and follow what appeared to be the boiler's instructions (ie turn down bottom CH temp dial & leave top HW dial on high). Result: just as described above - cold bath (brrrr after a hard day's work doing field sampling!) Instructions need to be logical and if they only apply in certain situations (eg only for combi boiler setups), this needs to be made clear, otherwise printing them on the cover is unhelpful at best.

I think I probably have a faulty programmer, as it seems to go haywire each time the clocks change in spring/autumn. Switching the electricity off for a while and then on again (classic IT technique!) appears to have got it back on track again this time, but I was a lot happier with the reliability of my previous Potteron, which lasted 35 years!

 

[ianniann]

It would help to know precisely what controller you have attached to the system. Some of them have a very simple mechanism for controlling this. For example, just press a "summer/winter" button so the controller goes into summer mode. Heating stays permanently off but water still gets hot. Even if it involves more buttons, there should be an equivalent.

I notice that the user manual does say to turn the CH control all the way down for summer operation. Perhaps your installation is not correct. More likely the installation is correct and the manual just doesn't reflect how to operate it.