External frost stat is in action or not doing anything?

[SJB060685]

Yes leave at those settings you mentioned above. Note if the rads struggle to get to temperature during extreme weather you may need to increase the flow temperature knob a bit but all these things should be considered during design stage. I’m not a fan of Worcester boilers personally but your system is installed now.
Most of us engineers on here are happy to help if possible. Myself and John here are passionate about what we do and if we can help and educate a little we will.

 

[Jurgenjay]

I just want to ensure that the valve closes, re opens and closes again and also to check the cylinder stat differential (hysteresis) temperature between cut in and cut out.
I think the cylinder stat is located above the coil return from your photo.

Re cylinder stat, with HW programmed on, turn stat down and note what its setting is, (check zone valve closing), turn stat back up slowly to reopen the zone valve, note the setting then turn it back down again to close the zone valve, gain note the setting, there should be ~ 5/8C differential.

Also see if the cylinder stat is located above the coil return from the cylinder.

Hi John, following your advice I have tested the stat and noted down each time temperatures. Please see below:

Photo1: turned down stat till heard "click", the zone valve for hot water was closing. The temperature is around 48°C;
Photo2: Turned up stat till heard "click", the zone valve for hot water was opening. The temperature is around 58°C;
Photo3: turned down stat till heard "click", the zone valve for hot water was closing. The temperature is around 48°C;
Photo4: Turned up stat till heard "click", the zone valve for hot water was opening. The temperature is around 58°C;

So, these mean the cylinder stat is working with no issue?

Thank you!

 

[Jurgenjay]

Also see if the cylinder stat is located above the coil return from the cylinder.

Hi John,
Yesterday the photo maybe not clear, I have taken again for you to see if the cylinder stat is above coil return from the cylinder?
Thanks again!

 

[John.g]

Everything looks good to me

 

[Jurgenjay]

Everything looks good to me

Everything---You mean both "stat on cylinder" and "if the cylinder stat is above coil return from the cylinder" are good?

Do you know "only nit pick is combo / inlet valve not above cylinder but that’s only a real issue when servicing cylinder just needs to be drained"---if this is an issue?

Thanks!

 

[Jurgenjay]

Yes leave at those settings you mentioned above. Note if the rads struggle to get to temperature during extreme weather you may need to increase the flow temperature knob a bit but all these things should be considered during design stage. I’m not a fan of Worcester boilers personally but your system is installed now.
Most of us engineers on here are happy to help if possible. Myself and John here are passionate about what we do and if we can help and educate a little we will.

Many thanks!
Really appreciate your input and John's!
As said, I know more from you guys online then the so called gas engineer I paid thousands of pounds!

 

[SJB060685]

Many thanks!
Really appreciate your input and John's!
As said, I know more from you guys online then the so called gas engineer I paid thousands of pounds!

Just promise us you won’t have him/them return. It’s alarming someone who advertises this line of work doesn’t even know the basics. I would seek advice from another G3 installed engineer as well as it would appear the frost stat is by passing the cylinder stat and controlling the HW zone valve. I’m not convinced that’s legal, logic would say not but I’m not currently G3 certified.

 

[John.g]

Everything---You mean both "stat on cylinder" and "if the cylinder stat is above coil return from the cylinder" are good?

Do you know "only nit pick is combo / inlet valve not above cylinder but that’s only a real issue when servicing cylinder just needs to be drained"---if this is an issue?

Thanks!

Everything---You mean both "stat on cylinder" and "if the cylinder stat is above coil return from the cylinder" are good?

Do you know "only nit pick is combo / inlet valve not above cylinder but that’s only a real issue when servicing cylinder just needs to be drained"---if this is an issue?

Thanks!

Yes, the stat position and stat operation are fine. The combination valve is often/normally mounted low down, you don't need a step ladder then to service it?

 

[Jurgenjay]

Yes, the stat position and stat operation are fine. The combination valve is often/normally mounted low down, you don't need a step ladder then to service it?

Thanks John!

 

[Jurgenjay]

Just promise us you won’t have him/them return. It’s alarming someone who advertises this line of work doesn’t even know the basics. I would seek advice from another G3 installed engineer as well as it would appear the frost stat is by passing the cylinder stat and controlling the HW zone valve. I’m not convinced that’s legal, logic would say not but I’m not currently G3 certified.

Yes, you are right that something for sure is wrong with my HW control, i.e. zone valve for HW never closed & burner light is off/on every couple of minutes, blue light is always on, even if the programmer is on for a long time---as long as programmer is on.

And you help me more make decision that not to call him for the warranty---my new boiler only a few months installed, it is well in the warranty period, but what is the point calling him if he does NOT know how the boiler is working?!
How could he be Woecster Bosch registered engineer then??
And he has not given me unvented cylinder system installation certificate as he is not G3 qualified I just found out...

 

[SJB060685]

Providing the boiler has been installed to manufacturers instructions then Worcester themselves would send an engineer should there be a warranty call. It’s just disheartening when a customer puts their faith in a guy/firm and pays thousands in your case for a system less than ideal. The old saying “a good engineer is an engineer for life” holds true. Hopefully you can find someone more qualified in the future.

 

[Jurgenjay]

Providing the boiler has been installed to manufacturers instructions then Worcester themselves would send an engineer should there be a warranty call. It’s just disheartening when a customer puts their faith in a guy/firm and pays thousands in your case for a system less than ideal. The old saying “a good engineer is an engineer for life” holds true. Hopefully you can find someone more qualified in the future.

Wocester Bosch did send an engineer came to check and confirmed to me: There's nothing wrong with boiler itself, it is the control or wiring issue, you should call your installer....
Not only boiler, but also newly installed radiators not all hot (half hot, half warm or cold); underground pipes bursted; bathroom pipe bursted, radiator leaked etc. all problems were done by this same guy!

 

[SJB060685]

Jesus. He sounds more like a handyman than a certified heating engineer.

 

[Jurgenjay]

Jesus. He sounds more like a handyman than a certified heating engineer.

He is registered on Worcester Bosch website, and he is on Checktrade but no review since last year August (just by time finished my boiler system installation).
For the questions I raised here (you may search this site I raised a lot of questions) he could not answer or sort out, thus I had to try to find answers myself.
He had a team member who did the boiler installation but left him now, I am not sure whether this is the reason he does not know the boiler because all boiler installation works were done by someone else?

During the boiler installation and after it, the boiler leaked water in garage!
Then upstairs all new radiators leaked water which flooded the house;
then one individual radiator leaked again which could not stop the water which resulted in downstairs celling with water dropped;
then underground pipes bursted which resulted in newly fitted marble floor was hammered and dug a hole;
then bathroom pipe bursted which made newly decorated house celling been flooded;

I have to stop otherwise it could be a further long list to go.....

 

[SJB060685]

I hope you claimed off his insurance!?