External frost stat is in action or not doing anything?

[Jurgenjay]

Yes legionella bacteria is killed off at 60°c. Yes set boiler control stat to that but no higher. The dew point for natural gas boilers starts at around 57°c, so your return water temperature needs to be that or lower, the lower the return temperature the greater the condensing. You also get greater condensing when the boiler is at part load but I won’t go into that now. If I was designing your system I would of done things a lot differently but that’s irrelevant now. As John says run his test to see what happens to the HW valve.

so I am going to turn the boiler temperature control smaller, something between level 4--5, about 71°c, or 70°c or 72°c.
My installed system has caused me so much trouble..... I wonder how you would design it! Anything could be better!
The worse thing is the boss/gas engineer of my system does NOT know any of those questions I raised here........

 

[Jurgenjay]

Depends on how it’s wired. If the frost stat by passes the cylinder stat it will hold the valve open,

Your this comment I think could explain for what happened in the morning on 21st of Jan when it was very cold, my boiler started to fire for 4 hours outside of the programmer setting time.

 

[SJB060685]

I would set the boiler control knob to 5 which is a flow temp of 74°c ish.
If I was designing your system I would of designed a low temperature system with a boiler with good modulation and PDHW (priority domestic hot water) on either weather compensation or load compensation, that depends on a few things There are lots of advantages to low temperature heating systems. Less fuel consumption, better condensing, greater levels of comfort and cleaner air due to lower convection currents, better for the environment and so on. It is alarming that the boss of the company who installed this system is not fully clued up.

 

[John.g]

I got your point for how to turn and note the temperatures. That will have 3 temperatures?
i.e. 1st temperature: turn down when zone valve closes; 2nd temperature: turn up when zone valve opens; 3rd turn down again to close the zone valve.
So three temperature notes---to test what? Sorry I don't understand this?

Also see if the cylinder stat is located above the coil return from the cylinder.---is attached photo good to see? (if not, I can take another one)

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.

 

[Jurgenjay]

I would set the boiler control knob to 5 which is a flow temp of 74°c ish.
If I was designing your system I would of designed a low temperature system with a boiler with good modulation and PDHW (priority domestic hot water) on either weather compensation or load compensation, that depends on a few things There are lots of advantages to low temperature heating systems. Less fuel consumption, better condensing, greater levels of comfort and cleaner air due to lower convection currents, better for the environment and so on. It is alarming that the boss of the company who installed this system is not fully clued up.

Right now it is 74°c(according to photo2), please see attached photo1. The stat on cylinder is between 60°c--65°c, something around 61°c?
So based on your theory should be 10°c higher, I should turn the boiler heating setting to around 71°c? (Turn to level 4 direction).

Your design looks good! But it is late now....

The boss's name and company are registered on the Wocester Bosch boiler website, so I picked him who should know the boiler system in theory!
The actual installation was done by his team member who left him, the boss did the commission.
But since I moved in, LOTS of problems happened! I can list 10 big issues here....
Worse of all, he came and checked, but he could not understand where/why gone wrong, I had to spend plenty of time here to get consultancy! I learn from you guys and got clearer answers than the one I paid over 5K for the system!!

 

[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!