Failed boiler upgrade.
- Thread starter themechanic
- Start date
Don't know about you, but I don't see a 37 kW combi as too much if you want a decent shower in winter when the incoming water is 4 C; by the time the water reaches the shower, you have about 11 litres per minute left at 45C rise. That is not bad, but by no means massive.
- Joined
- 19 Nov 2010
- Messages
- 20
- Reaction score
- 1
- Country
you must check the pipes for mud i think this is the problem
I do not understand why you are ignoring sound advice?. Vaillant advised you that the single pipe system would not work because the pump is to strong. The reason they stated this is because, unlike your previous pump, the new pump will pump the water around the one pipe system a lot faster, resulting in no temp difference between flow and return. Hence after the first attempt at heating the radiators, the pipes on the circuit will, as you have proved, will get unbearably hot all the way round. this will cause the boiler to shut down by its own thermostat and will not fire up again until the heat in the pipes have dispersed into the radiators by gravity, this cycle can continue for hours. Converting to hand wheel valves will make little difference and the only way that you will get an efficient system is to change it to two pipe where the radiators are under the influence of the pump. I am simply trying to save you wasting time and money.
Regards
spraggo
1 pipe systems ? well you could try ? cutting a valve between the tees eg & balancing the flow , (take trvs off ?) in theory if the valve was shut the water would have to go through the rad ! which would be ok untill u shut the rad off , this would than shut the entire ch down !
I have done this balancing type of valve on 1 pipe systems & seen it done many times in the past ,with some success , However , only on old style boilers ? never on a vorsprung durch (Vaillant) condenser ! she might not like it ?????????
I have done this balancing type of valve on 1 pipe systems & seen it done many times in the past ,with some success , However , only on old style boilers ? never on a vorsprung durch (Vaillant) condenser ! she might not like it ?????????
I don`t suppose it is a joke really ,when you think about it if you did this to all the rads, they would all eventually get hot and there would be a wide temp difference between the flow and return until the last rad got hot and that would keep the boiler condensing.
The plumber you got was an idiot.
He has over sized the boiler and fitted thermostatic radiator valves
to a single pipe system.
Take the thermostatic radiator valves off fit normal radiator valves
and these should be open fully and turn the boiler pump down to speed two or one.
I two pipe sysem will certainly cure the problems and give more responsive heating.
He has over sized the boiler and fitted thermostatic radiator valves
to a single pipe system.
Take the thermostatic radiator valves off fit normal radiator valves
and these should be open fully and turn the boiler pump down to speed two or one.
I two pipe sysem will certainly cure the problems and give more responsive heating.
Did not know you could turn the pump speed down on a combi boiler, would this not interfere with the hot water performance.
dcawkwell";p="1805526 said:turn the boiler pump down to speed two or one.
on a combicome off it
This thread is comedy gold!
Sounds right to me.?
on a one pipe system, would heat not travel this way?, sorry for not getting it right.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
