Boards.ie uses cookies. By continuing to browse this site you are agreeing to our use of cookies. Click here to find out more x
Post Reply  
 
 
Thread Tools Search this Thread
27-10-2020, 23:16   #151
jimmycrackcorm
Registered User
 
jimmycrackcorm's Avatar
 
Join Date: Jun 2003
Posts: 12,987
Quote:
Originally Posted by deezell View Post
Get that valve fixed, and the Tado would be perfect for you. As you only have a single valve in the CH flow, your system would appear to be configured for gravity mode. The wiring options for A two zone controller are a little different in gravity mode, and there are further differences between CH via pump, or CH via a valve. The valve has its own relay which closes when the valve opens, and this used to signal the boiler to fire for CH. In this instance, the live from the controller for HW ON goes straight to the boiler to fire it, the live for CH ON goes to the valve, which opens the flow and the closes the relay to fire the boiler. I'm curious as to why you boiler fires for CH if the valve is stuck. If stuck open, it would
keep firing the boiler continuously, but if stuck closed, then no CH.
It's possible that you Climote's two seperate zone live outputs have just been connected together to fire the boiler. In this case a live from the HW terminal is going to open the valve as well as a live from the CH terminal. This is why the valve has a relay, so that it can send a live to the boiler to fire it, but if the boiler call terminal is already live from another zone calling it (HW or CH2), this live will not feed back to the other zone and open it's valve. This logic is lost on some installers, who will happily join 2 or 3 zone ON terminals at the boiler, without realising this turns the system into a single zone, with any timer turning on all zones.
You need to check if that zone valve is opening, has it been mechanically locked open in service mode or is it stuck, and are there more than two wires connected to it, meaning it has an ON relay to fire the boiler. Get this sorted first, get two independent zones going, then you can consider better 2 zone smart stat systems.
I think it is a gravity system as my showers are non-electric just gravity fed. The climate is correctly turning on the boiler for Ch /water based on their respective thermostats, i.e. if I turn either up they only kick in if the correct zone is active. The valve must be stuck open or unable to close and as it's in line with the supply to the CH, my guess is that its purpose is to cut the flow to the CH if only hot water is active. This makes sense to me as if you only need water then the heat shouldn't be wasted on CH and if you have CH, then might as well heat water at the same time.

I'll get it fixed when I get a chance, basically take off the motor part and check to see if the valve itself is able to operate/observe if the motor activates when activating the zone.
jimmycrackcorm is offline  
Advertisement
28-10-2020, 09:36   #152
deezell
Registered User
 
deezell's Avatar
 
Join Date: Oct 2013
Posts: 3,733
Send a message via Skype™ to deezell
Gravity in terms of heating your HW means the heated water flows from the boiler to the HW cylinder by convection, without the aid of a pump. The heated water can only reach the rads if the circulation pump is on, so a it's possible to heat HW only by controlling the pump with the CH timer. If your boiler is a system boiler with the pump built in, then you isolate CH using a valve. In very basic systems, a single timer fires the boiler for both HW and CH, and the valve is usually controlled by the CH wall stat.
Replacing this with a 2 zone timer requires a particular type of wiring to keep the zones independent, and I suspect your climote simply combined the roles of timer and CH stat, meaning the valve is opening for any timed event, HW and CH. Its only closed when neither are on, so you never have HW only. I could be wrong, but a properly wired CH valve if stuck open would mean CH on all the time, stuck closed would mean no CH, so I suspect it's either been wired to both CH and HW outputs, or is permanently live and open (not good), and the Climote is just firing the boiler. I doubt if the valve relay is being used to call the boiler for CH timer events.

Last edited by deezell; 28-10-2020 at 09:41.
deezell is offline  
28-10-2020, 09:46   #153
deezell
Registered User
 
deezell's Avatar
 
Join Date: Oct 2013
Posts: 3,733
Send a message via Skype™ to deezell
Btw, you can observe the manual lever on the valve moving without removing the motor.
deezell is offline  
29-10-2020, 13:45   #154
jimmycrackcorm
Registered User
 
jimmycrackcorm's Avatar
 
Join Date: Jun 2003
Posts: 12,987
Quote:
Originally Posted by deezell View Post
Btw, you can observe the manual lever on the valve moving without removing the motor.
true, but if it is set to manual then it is open, or else it is set to automatic and my suspicion is that the actual valve is permanently open regardless, i.e. what isn't working is being able to close. The next time I go to cut the electricity off, I'll take it off and see what is happening.

Otherwise, I've no idea what the purpose of this motorized valve is... the wiring for it and the hot water tank thermostat are linked together which is why I think calling for hot water is supposed to close the valve to supply the rads.
jimmycrackcorm is offline  
29-10-2020, 14:15   #155
AndrewJRenko
Registered User
 
AndrewJRenko's Avatar
 
Join Date: Nov 2016
Posts: 12,358
Anyone else having trouble with the Hub since the clocks went back at the weekend? Ours is misbehaving, and getting inconsistent responses from connected phones.
AndrewJRenko is offline  
Advertisement
29-10-2020, 17:36   #156
deezell
Registered User
 
deezell's Avatar
 
Join Date: Oct 2013
Posts: 3,733
Send a message via Skype™ to deezell
Quote:
Originally Posted by jimmycrackcorm View Post
true, but if it is set to manual then it is open, or else it is set to automatic and my suspicion is that the actual valve is permanently open regardless, i.e. what isn't working is being able to close. The next time I go to cut the electricity off, I'll take it off and see what is happening.

Otherwise, I've no idea what the purpose of this motorized valve is... the wiring for it and the hot water tank thermostat are linked together which is why I think calling for hot water is supposed to close the valve to supply the rads.
It's might be a priority connection, calling for HW may have been designed to close the valve until the cylinder was heated and it's stat opens, allowing the rads to heat. This would prevent the CH from cooling the HW supply below a given temperature as the HW is always in circuit on a gravity feed. It's hard to tell exactly, but for sure the valve closing should cut the CH, and this should be operated by the CH live output of the Climote, and the valve in turn should use it's built in relay to call the boiler.
The connection from the valve to the cylinder stat might just be a convenient location to connect the two boiler calls, HW and CH, together, as the HW On live from the Climote should go via the cylinder stat and then to the boiler, to be joined to the CH live, not from the Climote, but from the valve relay. Like I said, the Climote appears to have been installed in place of a simpler single timer and wall stat installation, and this required a different wiring scheme for the 2 channel Climote, but just dropping the Climote in place of the wall stat was not correct. It will take a bit of tracing by a good sparks with heating control knowledge to get it right
deezell is offline  
02-11-2020, 20:43   #157
AndrewJRenko
Registered User
 
AndrewJRenko's Avatar
 
Join Date: Nov 2016
Posts: 12,358
Quote:
Originally Posted by AndrewJRenko View Post
Anyone else having trouble with the Hub since the clocks went back at the weekend? Ours is misbehaving, and getting inconsistent responses from connected phones.
https://twitter.com/hubcontroller/st...84140086349824

https://twitter.com/hubcontroller/st...08425639174144
AndrewJRenko is offline  
Post Reply

Quick Reply
Message:
Remove Text Formatting
Bold
Italic
Underline

Insert Image
Wrap [QUOTE] tags around selected text
 
Decrease Size
Increase Size
Please sign up or log in to join the discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search



Share Tweet