Hi everyone.
I am a new member, I have been reading some posts, and there is a lot of very useful information here.
I have just installed an Evohome System with a hot water controller and HR92 radiator controllers into an existing S plan system. I have done it all myself and it is working great despite the installation instructions being a bit vague!
I am experimenting with the hot water temperature to make sure it gets to between 55-60 degrees, I was a bit worried as the position on my cylinder for the water temp sensor is quite low down so I thought the top of the tank would get much hotter but it seems to be spot on. Incidentally, my old system did not have any kind of water over temperature sensor, should I fit one in case the Evohome system loses comms and carries on trying to heat the water?
So I have the HR92's set to control the heating zone valve as the old controller did, the valve opens and turns on the pump and the boiler, and when it closes, it switches off the pump and boiler all as it should.
However, is there any advantage in fitting a third BDR91 relay to control the boiler separately? I worry (probably unnecessarily) that the boiler can be running flat out and when demand stops the valve closes and it shuts the boiler and the pump off when there is a lot of heat left in the boiler. Can or is the Evohome capable of switching the boiler on/off and leaving the zone valve and pump to run on as and when necessary? I do not have any type of pump overrun system and there is a bypass to 2 radiators with no valves fitted.
I have read some posts about the Evohome modulating the boiler which makes sense rather than it having to run flat out when heat is called for and then suddenly switched off, but this will only work if the Evohome will/can control the zone valve separately and therefore turn the pump on too.
Also, I need to add some more HR92 radiator valves to existing rooms where I have added 1 but need to add 2 to one room and 1 to 2 other rooms, how do you do add one to a zone after the initial setup? Or do i have to delete my existing zones before adding a new zone to see the option to add more radiator valves at the initial setup?
The boiler is an oil fired Trianco Eurostar, there are a total of 24 radiators split into 12 zones and some radiators will not have controls but will be set on a low setting for background heat whenever another zone is calling for heat.
I am a new member, I have been reading some posts, and there is a lot of very useful information here.
I have just installed an Evohome System with a hot water controller and HR92 radiator controllers into an existing S plan system. I have done it all myself and it is working great despite the installation instructions being a bit vague!
I am experimenting with the hot water temperature to make sure it gets to between 55-60 degrees, I was a bit worried as the position on my cylinder for the water temp sensor is quite low down so I thought the top of the tank would get much hotter but it seems to be spot on. Incidentally, my old system did not have any kind of water over temperature sensor, should I fit one in case the Evohome system loses comms and carries on trying to heat the water?
So I have the HR92's set to control the heating zone valve as the old controller did, the valve opens and turns on the pump and the boiler, and when it closes, it switches off the pump and boiler all as it should.
However, is there any advantage in fitting a third BDR91 relay to control the boiler separately? I worry (probably unnecessarily) that the boiler can be running flat out and when demand stops the valve closes and it shuts the boiler and the pump off when there is a lot of heat left in the boiler. Can or is the Evohome capable of switching the boiler on/off and leaving the zone valve and pump to run on as and when necessary? I do not have any type of pump overrun system and there is a bypass to 2 radiators with no valves fitted.
I have read some posts about the Evohome modulating the boiler which makes sense rather than it having to run flat out when heat is called for and then suddenly switched off, but this will only work if the Evohome will/can control the zone valve separately and therefore turn the pump on too.
Also, I need to add some more HR92 radiator valves to existing rooms where I have added 1 but need to add 2 to one room and 1 to 2 other rooms, how do you do add one to a zone after the initial setup? Or do i have to delete my existing zones before adding a new zone to see the option to add more radiator valves at the initial setup?
The boiler is an oil fired Trianco Eurostar, there are a total of 24 radiators split into 12 zones and some radiators will not have controls but will be set on a low setting for background heat whenever another zone is calling for heat.
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