Hello guys.
I am having a number of issues with my Central Heating system. It was commissioned in July 2019 whereby the heating was not turning on (via the room stats) due to the summer weather understandbly. I only noticed these problems in the winter when my heating expectations were not being met. So the problems I am experiencing are likely to have been there from day 1 and not developed over time.
The system...
Intergas Xclusive 30 modulating condensing boiler. I believe the default output and modulating pump settings are in play. 75C is the CH water temperature
DHW served through the boiler to the kitchen tap only
CH served via a S-Plan to...
1. the unvented hot water cyclinder - serves the bathrooms and WC
2. the downstairs UFH manifold with mixer set at 45C with variable pump
3. the upstaires UFH manifold with mixer set at 55C with variable pump
Experiences
The downstairs UFH is on screed and doesnt drop in temperature much
The Hot water cyclinder seems to be working fine - i.e we are never short of hot water in the bathrooms/wc
The upstairs UFH drops in temperature by 3-4C before required to come back up to 19-20C when the room stats call for heat.
The upstairs UFH never/rarely gets to 55C at the mixer, the result is that I am lucky if I reach 19-20C in some rooms.
The downstairs UFH behaves the same also I believe but is less noticed as the temperature differetials are much lower and the rooms seem to hover around 18,19,20 downstairs.
Problem
When all three CH zones are calling for heat, the upstairs UFH (and possibly the downstairs UFH too) are not getting heat from the boiler resulting in the manifold never reaching the set 55C.
When I stop the Call for Heat on the Hot water cyclinder and the downstairs UFH, the upstairs UFH starts to warm up and reached 55C.
I have done a number of tests where, from cold, I call for heat from only the upstairs manifold and this results in the UFH getting up to the 55C temperature. So I am relatively sure that it is some sort of a starvation problem?
I think that this might be happening to the downstairs UFH manifold too but I havent 100% confirmed this as downstairs screed seems to stay warm and we dont notice a 'lack of heating' downstairs for me to worry about.
Also, if I turn off just the Hot water call for heat and leave on the upstairs and downstairs UFH call for heat then again, the upstairs UFH mandifold fails to get to 55C. So I am not sure if there is an inherent priority in play favouring the hot water cylinder, then the downstairs UFH and then the upstairs UFH.
Any ideas on whats going wrong here?
Note: The system was tested by the installer i.e upstairs UFH and the downstatis UFH and then unvented hot water cylinder, but may have been tested individually hense signed off as working
I am having a number of issues with my Central Heating system. It was commissioned in July 2019 whereby the heating was not turning on (via the room stats) due to the summer weather understandbly. I only noticed these problems in the winter when my heating expectations were not being met. So the problems I am experiencing are likely to have been there from day 1 and not developed over time.
The system...
Intergas Xclusive 30 modulating condensing boiler. I believe the default output and modulating pump settings are in play. 75C is the CH water temperature
DHW served through the boiler to the kitchen tap only
CH served via a S-Plan to...
1. the unvented hot water cyclinder - serves the bathrooms and WC
2. the downstairs UFH manifold with mixer set at 45C with variable pump
3. the upstaires UFH manifold with mixer set at 55C with variable pump
Experiences
The downstairs UFH is on screed and doesnt drop in temperature much
The Hot water cyclinder seems to be working fine - i.e we are never short of hot water in the bathrooms/wc
The upstairs UFH drops in temperature by 3-4C before required to come back up to 19-20C when the room stats call for heat.
The upstairs UFH never/rarely gets to 55C at the mixer, the result is that I am lucky if I reach 19-20C in some rooms.
The downstairs UFH behaves the same also I believe but is less noticed as the temperature differetials are much lower and the rooms seem to hover around 18,19,20 downstairs.
Problem
When all three CH zones are calling for heat, the upstairs UFH (and possibly the downstairs UFH too) are not getting heat from the boiler resulting in the manifold never reaching the set 55C.
When I stop the Call for Heat on the Hot water cyclinder and the downstairs UFH, the upstairs UFH starts to warm up and reached 55C.
I have done a number of tests where, from cold, I call for heat from only the upstairs manifold and this results in the UFH getting up to the 55C temperature. So I am relatively sure that it is some sort of a starvation problem?
I think that this might be happening to the downstairs UFH manifold too but I havent 100% confirmed this as downstairs screed seems to stay warm and we dont notice a 'lack of heating' downstairs for me to worry about.
Also, if I turn off just the Hot water call for heat and leave on the upstairs and downstairs UFH call for heat then again, the upstairs UFH mandifold fails to get to 55C. So I am not sure if there is an inherent priority in play favouring the hot water cylinder, then the downstairs UFH and then the upstairs UFH.
Any ideas on whats going wrong here?
Note: The system was tested by the installer i.e upstairs UFH and the downstatis UFH and then unvented hot water cylinder, but may have been tested individually hense signed off as working