Originally posted by mylesm
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Help with Evohome / Opentherm / Intergas
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Originally posted by mylesm View PostOh Sorry Earlier I was talking about Parameter C and I thought you were referring to that when you said it was on 1 and not E. being on 1
Just to clarify, my settings are:
C = 1 (Factory setting)
E = 25 (This should work OK for you)
E. = 1 (Factory setting)
For our system, I found that lowering the pump speed all but eliminated the sound of water flowing through radiators - well worth doing if you have that particular issue.
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Originally posted by blowlamp View PostNo problem.
Just to clarify, my settings are:
C = 1 (Factory setting)
E = 25 (This should work OK for you)
E. = 1 (Factory setting)
For our system, I found that lowering the pump speed all but eliminated the sound of water flowing through radiators - well worth doing if you have that particular issue.
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Originally posted by mylesm View PostGreat Thanks How is the opentherm working for you have you used it through a winter yet
OpenTherm worked brilliantly for us through last winter, but remember that our system isn't controlled by Evohome and has weather compensation, so not directly comparable to your setup.
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According to this website, the R8810 OpenTherm bridge has many MsgIDs enable that don't seem to be used by the Evohome system - and that includes MsgID 57 which is max CH water setpoint see here. Why build a capability into a product and then say it can't be used?
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Well Opentherm Bridge arrived installed this morning no problem Had 3 Rooms set for 22c all day to test seems to operate well not sure of lowest flow temp as no pipe thermometer but boiler definitely modulating to a low flow temp
No problem binding bridge to Evohome first time all good
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Well I have Intergas Rapid installed now for about 2 weeks it is in Heat only mode no HW may long term use combi side for kitchen Sink
I read here about Intergas and opentherm problems but I went ahead and installed opentherm I notice it working well in my system modulates flow temp and keeps Zones at a very stable Temp almost always at the setpt
SO what were the percieved problems with Intergas and Opentherm and are they Resolved
Thanks
Mylesm
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Originally posted by mylesm View PostSO what were the percieved problems with Intergas and Opentherm and are they Resolved
Thanks
Mylesm
Was there anything wrong with the Intergas boiler... No. Was there anything wrong with evohome... Maybe (but Maybe Not). Is there anything wrong with all tests I have carried out over the past 2 months with multi zoning and evohome on OpenTherm... No.
This is all the information I can give you based solely on my own experience over the past few months. Before this is was unable to test this myself, due to lack of facility.
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Originally posted by mylesm View PostWell I have Intergas Rapid installed now for about 2 weeks it is in Heat only mode no HW may long term use combi side for kitchen Sink
I read here about Intergas and opentherm problems but I went ahead and installed opentherm I notice it working well in my system modulates flow temp and keeps Zones at a very stable Temp almost always at the setpt
SO what were the percieved problems with Intergas and Opentherm and are they Resolved
Thanks
Mylesm
The main issue as I see it, is the proportional band (as chosen by Honeywell), is a quite narrow 1C to 1.5C. This band is the envelope in which OpenTherm/Evohome modulates the CH flow temperature and would appear to be the behaviour you're seeing with your system at the moment.
However, if for instance a zone that is below the proportional band calls for heat into a system that is already satisfied and modulating smoothly, then Evohome will prompt the boiler to give its maximum adjusted output. It therefore follows that significantly hotter water is now flowing into radiators in rooms which are already at their desired temperature and thus raising it until the TRV is able to bring it back down.
This effect leads one to think that the boiler isn't modulating correctly, especially if several zones are outside the band at overlapping times.
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Originally posted by blowlamp View PostThere is nothing wrong with the OpenTherm communication link between the Intergas boiler and Evohome controller.
The main issue as I see it, is the proportional band (as chosen by Honeywell), is a quite narrow 1C to 1.5C. This band is the envelope in which OpenTherm/Evohome modulates the CH flow temperature and would appear to be the behaviour you're seeing with your system at the moment.
However, if for instance a zone that is below the proportional band calls for heat into a system that is already satisfied and modulating smoothly, then Evohome will prompt the boiler to give its maximum adjusted output. It therefore follows that significantly hotter water is now flowing into radiators in rooms which are already at their desired temperature and thus raising it until the TRV is able to bring it back down.
This effect leads one to think that the boiler isn't modulating correctly, especially if several zones are outside the band at overlapping times.
I used to really try to run my heating on Schedules etc but for the last number of years I have it set to be Bedrooms 18C Living Rooms 21c at 6:00am
All Zones Back to 15c at 23:00 So I usually never have a Zone coming on looking for Max heat on its own when other zones are already at setpt that probably explains why its working well
My House is well insulated and has HRV etc and using heating as above I find Gas Bills Very reasonable
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Well I have had the Intergas Boiler running with Evohome Opentherm Bridge now for a while and it seems to be working fine at the moment my Boiler Display is showing 1 which is "desired temp reached " my Zones are set for 21c Flow Temp is approx 28c and all Zones are holding setpoint fine
I notice with opentherm my Pump runs almost all the time heating is on is this normal I presume the boiler is circulating water at just enough heat content to maintain Zone Temp where with BDR Control Boiler switches on/off to maintain temp
Its hard to know if the Gas saved is offset by extra electricity used by pump running for extended periods
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