Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Mitsubishi Ecodan-Z...
 
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!

Mitsubishi Ecodan-Zubadan in Hybrid /backup configuration with gas boiler

 
Air Source Heat Pumps (ASHPs)
Last Post by sorin 2 years ago
1 Posts
1 Users
0 Reactions
1,461 Views
RSS
 sorin
(@sorin)
New Member Member
Joined: 2 years ago
Posts: 4
Topic starter 09/12/2024 3:35 pm   [#1920]

Hello!

I own a Mitsubishi Ecodan / Zubadan ASHP 14kW with a gas boiler attached as backup heat source. It can help in colder periods but it should also switch based on energy price.

Mitsubishi also released this document

HOCTORREFRIGERATION.COMHOCTORREFRIGERATION.COM "https://hoctorrefrigeration.com/wp-content/uploads/2020/09/ECODAN-Hybrid-Boiler-Application.pdf"

Which states that it can be achieved but it is not technical.

The HP has an Intelligent operation mode where it can select Cost based between electricity and gas based on the price/kW of each energy.

I expect as example that at a certain outside temperature,

COP=3 and 3kW of heat are produced from 1kW electricity
1kWh electricity costs 0.6. But it produces 3kWh heat with a cost of 0.2 /kWh heat
1kWh produced with gas costs 0.2 => it produces 1kWh heat with a cost of 0.2
=> it should stay as it is for now. As soon as the outside temperature drops and COP drops => it should switch to gas boiler which becomes cheaper /kWh produced.

Settings:
Service menu / Operation settings / Boiler Operation / Hybrid settings/Priority Mode: Cost
Service menu / Operation settings / Boiler Operation / Intelligent settings/Energy Price / Electricity: 0.6 */kWh
Service menu / Operation settings / Boiler Operation / Intelligent settings/Energy Price / Boiler : 0.2 */kWh

I can force a boiler operation when accessing
Service menu / Heat source setting (Standard/Heater/Boiler/Hybrid *7) : Boiler.

But when i select Hybrid, it only runs on HP, although it should switch based on the Cost setting.

To test, I used a ridiculosly increase price for electricity (1000x) and it does not switch to gas.

I can also force only boiler operation using the settings:
Service menu / Operation settings / Boiler Operation / Hybrid settings /Outdoor ambient temperature: HP-Boiler when under -15 and Boiler to HP when over 1 (deg C). But it does not account the cost variable and it never switches.
The manuals say very little about this topic. They say it should work.

if anyone has this setup and can advice or is an installer that did this before. thank you in advance for helping me out.



   
Quote
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