Hi all, perhaps you can educate me as to how my heating system is actually performing compared to my perception? Apologies for the long winded following but I think it is important to include all info.
The boiler is a Vaillant ecoTEC+ 831 with Honeywell wireless programmer (CM927).
I have the programmer programmed with all 7 days the same and using all 6 time-zones. My query is as follows: One of my time-zones is 0930-1500 target temp set at 18 degrees on the basis of us normally being out. If we are at home I over-ride the 18 with 20. The temp usually gets to 19 (according to the ‘room temp’ on the Honeywell) and no more
29 Jan 2019 - I did a mini monitor/test – log as follows:
10.00 Over-rode the 18 with 20
10.40 Stat – no demand. Target 20, actual 19.
10.45 Stat demands (green light on receiver). Boiler fires, burner indictor rises to above 1/2 way. Flow temp rises from 43 to 52 within 5/6 seconds but then the burner drops to below ¼ position. Flow temp drops to 42 and stays there until…
10.53 ..when the demand led extinguishes. Stats says – target 20 actual 19.
10.55 Stat demands. (target 20 actual 19) and as above:
Burner rises to above ½ way for about 5/6 seconds then drops to below ¼ and flow temp goes from 43 to 50 and back to 47 during this short period until:
11.00 ….when the burner rises to ½ position, flow temp up to 57 degrees (return temp only warm)
11.03 Demand led extinguishes. At Stat – target 20 actual 19….still.
At 11.35 Stat temp of actual 19.5. A full 95 mins after overriding the 18 with 20.
My boiler is still under warranty via my local company who installed it. Had a leak recently, and my company called out Vailliant (suspected diverter leak). Vailliant came out, replaced the diverter (removed plastic diverter and replaced with brass one). Otherwise the heating has worked ok but I have been disappointed by the slow response to requested change as per my query here. I have raised this several times with my maintainer but despite changes to some parameters, does not seem to have made any difference. Parameters changed - Target Flow Temp = 75 degs, Boiler load set to 19.5 KW ( I have calculated my total radiator output to be in the region of 14KWs simply by adding up the rad values.
Consolation? Hot water fantastic !
If this is normal operating procedure then I will have to live with it but would like a view from you pros.
I have ordered a pipe thermometer to check out temp drop across system and individual rads, so may have more info to add soon.
Thanks for having the patience to read all this !!
SjH
The boiler is a Vaillant ecoTEC+ 831 with Honeywell wireless programmer (CM927).
I have the programmer programmed with all 7 days the same and using all 6 time-zones. My query is as follows: One of my time-zones is 0930-1500 target temp set at 18 degrees on the basis of us normally being out. If we are at home I over-ride the 18 with 20. The temp usually gets to 19 (according to the ‘room temp’ on the Honeywell) and no more
29 Jan 2019 - I did a mini monitor/test – log as follows:
10.00 Over-rode the 18 with 20
10.40 Stat – no demand. Target 20, actual 19.
10.45 Stat demands (green light on receiver). Boiler fires, burner indictor rises to above 1/2 way. Flow temp rises from 43 to 52 within 5/6 seconds but then the burner drops to below ¼ position. Flow temp drops to 42 and stays there until…
10.53 ..when the demand led extinguishes. Stats says – target 20 actual 19.
10.55 Stat demands. (target 20 actual 19) and as above:
Burner rises to above ½ way for about 5/6 seconds then drops to below ¼ and flow temp goes from 43 to 50 and back to 47 during this short period until:
11.00 ….when the burner rises to ½ position, flow temp up to 57 degrees (return temp only warm)
11.03 Demand led extinguishes. At Stat – target 20 actual 19….still.
At 11.35 Stat temp of actual 19.5. A full 95 mins after overriding the 18 with 20.
My boiler is still under warranty via my local company who installed it. Had a leak recently, and my company called out Vailliant (suspected diverter leak). Vailliant came out, replaced the diverter (removed plastic diverter and replaced with brass one). Otherwise the heating has worked ok but I have been disappointed by the slow response to requested change as per my query here. I have raised this several times with my maintainer but despite changes to some parameters, does not seem to have made any difference. Parameters changed - Target Flow Temp = 75 degs, Boiler load set to 19.5 KW ( I have calculated my total radiator output to be in the region of 14KWs simply by adding up the rad values.
Consolation? Hot water fantastic !
If this is normal operating procedure then I will have to live with it but would like a view from you pros.
I have ordered a pipe thermometer to check out temp drop across system and individual rads, so may have more info to add soon.
Thanks for having the patience to read all this !!
SjH