Forums

Forums
Renewable Heating
Air Source Heat Pum...
Ecodan high pressur...
 
Notifications
Clear all

Ecodan high pressure at 3 bar

 
Air Source Heat Pumps (ASHPs)
Last Post by @sand 1 year ago
10 Posts
4 Users
2 Reactions
2,558 Views
RSS
 @sand
(@sand)
Estimable Member Member
Joined: 4 years ago
Posts: 87
Topic starter 13/11/2024 6:38 pm  

We have a Mitsubishi Ecodan with UFH downstairs and radiators upstairs. The pressure at the water tank is 3 bar. 

I have lowered this by bleeding water from the radiators to 2 bar as indicated by the fixed red marker on the pressure gauge. 

This has gone back up to 3 bar and there is water coming from all the radiator bleed valves when opened so no air in them it seems.

We have had 2 new towel rails replacing cheap old ones. Not sure if this has anything to do with it.

Any advice on how I can resolve this issue and what might be causing it?

Andy



   
Quote
Topic Tags
Help needed
 dorkypark
(@dorkypark)
Active Member Member
Joined: 1 year ago
Posts: 9
13/11/2024 6:55 pm  

Something similar happened to me once with a gas system boiler. The filling loop hadn't been closed properly and it was pushing up the pressure over time. You might want to check that.



   
👍
1
ReplyQuote
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3600
13/11/2024 7:25 pm  

Posted by: @dorkypark
↑

The filling loop hadn't been closed properly and it was pushing up the pressure over time. You might want to check that.

That's a good reason to disconnect the filling loop when not in use, in the way that it is designed for!

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
ReplyQuote



 @sand
(@sand)
Estimable Member Member
Joined: 4 years ago
Posts: 87
Topic starter 13/11/2024 7:25 pm  

Hi thanks for that, I'm not sure  if I'm correct but I seem to remember having to open a valve to add pressure to the system. Would this be the valve that you mean? It was fully open and I've now closed it.


This post was modified 1 year ago by Mars

   
ReplyQuote
 @sand
(@sand)
Estimable Member Member
Joined: 4 years ago
Posts: 87
Topic starter 13/11/2024 7:31 pm  
20241113 192918

This is the valve I have closed is that correct, will I need to bleed rads again?



   
ReplyQuote
 dorkypark
(@dorkypark)
Active Member Member
Joined: 1 year ago
Posts: 9
13/11/2024 8:00 pm  

Yes, you would need to reduce the pressure to the correct value for your system (usually 1 to 1.5 bar when cold).

 

And as @jamespa says, disconnecting the filling loop when not used is the correct thing to do.



   
👍
1
ReplyQuote
 @sand
(@sand)
Estimable Member Member
Joined: 4 years ago
Posts: 87
Topic starter 13/11/2024 8:05 pm  

Thanks, will do.



   
ReplyQuote
Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2312
14/11/2024 12:19 pm  

@sand I far as I am aware, all systems have two of these valves (one on each side of the mains feed to the red tank; these should both be shut off after any adjustment to pressure. (I may be wrong but all systems I have come across have the two valves and plumbers have told me they should both be shut after adjustments are complete.) Nervously, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
ReplyQuote
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3600
14/11/2024 12:55 pm  

Posted by: @toodles
↑

@sand I far as I am aware, all systems have two of these valves (one on each side of the mains feed to the red tank; these should both be shut off after any adjustment to pressure. (I may be wrong but all systems I have come across have the two valves and plumbers have told me they should both be shut after adjustments are complete.) Nervously, Toodles.

You are correct, but they also come with thumb-turn fittings so they can be disconnected easily.  On mine at least its necessary to do this to be sure that the shut off valve is truly shut off.

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
ReplyQuote



 @sand
(@sand)
Estimable Member Member
Joined: 4 years ago
Posts: 87
Topic starter 14/11/2024 1:17 pm  

Thanks @toodles @jamespa will get hubby to check this.



   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Topic Tags:  Help needed (2) ,
Share:

Join Us!

Podcast Picks

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →