Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Red Expansion Tank
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Red Expansion Tank

 
Page 2 / 2
Air Source Heat Pumps (ASHPs)
Last Post by BobTSkutter 2 years ago
16 Posts
3 Users
5 Reactions
5,468 Views
RSS
 Richard24738
(@richard24738)
Estimable Member Member
Joined: 3 years ago
Posts: 104
Topic starter 21/02/2025 8:07 pm  

@bobtskutter Hi Bob. Daft mistake with the valve.

The red expansion tank is not attached to the hot water cylinder.

I can't find the PSV you mention on the heating side.

Filling the system from 0 to 1.5 did not take long although I did slow it down towards the end. I'm only guessing maybe 5 seconds and then a few more.

The installer did ask me to check the auto air valve on top of the buffer tank to see if wet. Totally dry and always auto open so I don't know if it's been venting air. Maybe that's it! 

A few weeks ago the system was drained down so maybe trapped air in the system has suddenly found it's way out. Hope that's the reason and why the pressure only dropped.

Will monitor the pressure over the weekend.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
ReplyQuote
 BobTSkutter
(@bobtskutter)
Estimable Member Member
Joined: 2 years ago
Posts: 94
21/02/2025 8:38 pm  

🙂  I'd love to know what you find out, please post the solution.

Regards

Bob



   
ReplyQuote
 Richard24738
(@richard24738)
Estimable Member Member
Joined: 3 years ago
Posts: 104
Topic starter 23/02/2025 2:17 pm  

@bobtskutter Hi Bob. Just a short update to say that the Red expansion tank guage is stable on 1.2 reinforcing my thought that it was air in system. It was drained down 4 weeks ago and maybe the release of trapped air was delayed or maybe I just hadn't noticed it.

I will still keep an eye on it though.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
👍
1
ReplyQuote
 BobTSkutter
(@bobtskutter)
Estimable Member Member
Joined: 2 years ago
Posts: 94
23/02/2025 3:48 pm  

Excellent, I'm glad it's settled down.

Regards

Bob



   
👍
1
ReplyQuote
Page 2 / 2
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO