Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Ecodan Cascade syst...
 
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!

Ecodan Cascade system conflicting views

 
Air Source Heat Pumps (ASHPs)
Last Post by Derek M 4 years ago
6 Posts
3 Users
1 Reactions
2,527 Views
RSS
 JPST21
(@jpst21)
Active Member Member
Joined: 4 years ago
Posts: 8
Topic starter 03/01/2023 6:34 pm   [#720]

Hi All 

Great content and reading so far. 

We have 2 x 14kw R32 single phase Ecodan's on their own phase with a 500l HW tank and a 500l buffer. 

The house is 5200 square feet but 2/3 of it are double height ceilings. Its very well insulated as was completely modernised/extended 10 years ago and the guy really went to town on insulation - even the dry lining is insulated plasterboard.   We have since the heat-loss calc changed 3/4 of the windows to triple glazed so improved still further from the 22mm double glazed units. 

I have loads of questions but will start with this that had divided opinion:

Should the heating for the buffer tank be set to temperature compensation? 

Currently its at 45 degrees with hot water priority (10 degree drop) 

They only went live just before Christmas so quite early in ownership/experience 

Thoughts? 

 



   
Quote
 JPST21
(@jpst21)
Active Member Member
Joined: 4 years ago
Posts: 8
Topic starter 03/01/2023 8:40 pm  

Plant room picture - still some temporary plumbing in there that will be removed soon 

8CAA4EB7 0C6C 45B0 9144 CE9015006944

 



   
ReplyQuote
 TomMcL
(@tommcl)
Active Member Member
Joined: 4 years ago
Posts: 12
03/01/2023 10:23 pm  

Hi JPST21.  delighted to see another Ecodan Cascade system on the RHH.  I was beginning to think I was the only one!  I have 2X 11.2KW R32s with Mitsi FTC controllers and the wireless room stat.  Also switched on December 9th just before the temperature dropped and scared the pants off me watching the power meters spin.

Have you worked out how to get a COP figure out of this system?  Mine says that the energy monitors are not installed? 

Happy to compare notes.

Best regards

Tom



   
ReplyQuote
 JPST21
(@jpst21)
Active Member Member
Joined: 4 years ago
Posts: 8
Topic starter 03/01/2023 11:05 pm  

Hi Tom

We’re having the Wi-Fi link installed to be able to use the app rather than go to the plant room to make setting changes. 
The energy usage parts are missing which may not be a bad thing although the new supply meter was at zero it’s now reading almost 1900 in 12 days. That did include the end of the cold snap and heating 1000 litres from 11 degrees. 
There must be a way to see the usage v generation 

The units were supplied as a kit but one terminal block was missing and support told the installers it could be done with the dip switches but this was incorrect and we lost 10 days waiting for the part! 

It’s been a bit of a bumpy road so far to say the least 

Jez



   
ReplyQuote
 TomMcL
(@tommcl)
Active Member Member
Joined: 4 years ago
Posts: 12
03/01/2023 11:42 pm  

Hi Jez  Very few on this forum seem to be bump free.  The wireless kit is good though my software writer son was very rude about the limited functionality of the app interface.    It certainly does allow one to control the setup remotely.  Though I keep reading threads here that suggest that if we only get the weather compensation process right it will not need to be touched!  I have not worked out how to do that yet.

Between December 10th startup and Monday January 2nd (23 days) my system consumed 1140 KWh.  ( but in a much smaller house  281m2, heat loss estimate 16.5KW) 

 



   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
04/01/2023 2:02 am  

Posted by: @tommcl
↑

Hi Jez  Very few on this forum seem to be bump free.  The wireless kit is good though my software writer son was very rude about the limited functionality of the app interface.    It certainly does allow one to control the setup remotely.  Though I keep reading threads here that suggest that if we only get the weather compensation process right it will not need to be touched!  I have not worked out how to do that yet.

Between December 10th startup and Monday January 2nd (23 days) my system consumed 1140 KWh.  ( but in a much smaller house  281m2, heat loss estimate 16.5KW) 

 

I have not looked in detail at a cascade system, since the necessity has only just arisen. I have attached a copy of the very comprehensive manual that Kev posted some time ago, it may throw some light of the subject.

There are also various YouTube videos giving details of how to set up and adjust the parameters for weather compensation. I think that many on the forum would be interested in details of what your son found.

Ecodan_ATW_Databook_R32_Vol5.3_.pdf

 



   
👍
1
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online

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