Search found 10 matches
- Thu Nov 03, 2016 7:25 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
Thanks. Yes it's currently electrically disconnected and latched open (and all my rads have HR92's). Any advice on how to wire up to the pump? My Vailant has an internal pump, not sure how I'd connect the valve appropriately - and my plumber has run far away from my setup as he finds Evohome too ...
- Wed Nov 02, 2016 5:25 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
When you use the manual "filling/draining" lever on the valve you are only opening the valve about half way or probably even a bit less than half way. Only the motor can open the valve fully. This will cause a significant restriction in the flow rate through the radiators, and might cause enough of ...
- Fri Oct 07, 2016 1:14 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
The boiler flow temp limit should be set to suit hot water recovery, depends on what cylinder you have really? Cylinder is a 300l Joule unvented indirect. Have got the CH valve set open now so things seem better overall. Still seems to stay on (albeit at low temp e.g. 40 deg) during heating times ...
- Thu Oct 06, 2016 8:37 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
No idea why, but the post (below) which I submitted earlier isn't showing, so I'm pasting it again! Ahh okay, makes sense. Currently HW target is set at 57 and I have the boiler limit set to 70 - my theory is that 70 is hot enough to heat the HW quickly and just about okay for times of huge heat ...
- Thu Oct 06, 2016 6:12 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
Hot water overrun gives the boiler a 'soft landing' when the cylinder is recharged. You may be able to reduce the DHW set point a few degrees. Ahh okay, makes sense. Currently HW target is set at 57 and I have the boiler limit set to 70 - my theory is that 70 is hot enough to heat the HW quickly ...
- Thu Oct 06, 2016 5:59 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
Thank you so much for the help. Will do just that. Just two (hopefully final) questions - what difference does it make setting the pump to Comfort vs Eco. I have changed it per your suggestion but not sure exactly what it's done? Also, do I really need the overrun setting for HW since it's got a ...
- Thu Oct 06, 2016 5:16 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
Sounds like the boiler is modulating so nothing fundamental wrong but I would bin the heating zone valve and this will let the boiler pump the water round the primary even when there's low load heat demand. The low load operation is a very interesting area and it's best to let the OpenTherm run ...
- Thu Oct 06, 2016 3:53 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Re: Issue with Vailant Opentherm
Hi You're mixing control strategies here. Evohome does not offer a full integration for priority hot water so I'm not sure what you hope to gain by having an S Plan configuration with an OT bridge. However it is possible to configure this, you'll need to take the feed from C on the DHW BDR to A on ...
- Mon Oct 03, 2016 8:39 pm
- Forum: OpenTherm Setup & Help
- Topic: Issue with Vailant Opentherm
- Replies: 17
- Views: 1079
Issue with Vailant Opentherm
I'd appreciate some help on the following issue I'm experiencing please... My boiler is a Vaillant Ecotec Plus 637 (system boiler), and I have the Opentherm module installed together with the Evohome Opentherm bridge. My installation is 'S plan' and I have HR92's on all radiators, yet I also have ...
- Mon Oct 03, 2016 8:26 pm
- Forum: Honeywell Home evohome
- Topic: Installation Guides
- Replies: 4
- Views: 432
Re: Installation Guides
Same here. I added my order number to my registration but can't send a PM (per the instructions) as I didn't yet 'participate' enough! Would appreciate help to access the customer area.