Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Ecodan FTC6 DHW tim...
 
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 FTC6 DHW timing etc

 
Air Source Heat Pumps (ASHPs)
Last Post by F1p 4 months ago
4 Posts
2 Users
0 Reactions
427 Views
RSS
 DavidAlgarve
(@davidalgarve)
Reputable Member Member
Joined: 2 years ago
Posts: 244
Topic starter 16/01/2026 11:03 am   [#2750]

I am again trying to optimise my DHW settings taking into account my 2 part tariff, large power demand, (even on "Eco" setting) and any possible contribution that might be available from 4kW solar.

In this regard, could anyone explain the meaning and possible setting for "Mode Restriction" and "Recharge"?

I note that in the case of the latter it is set on "Large" and there doesn't appear to be an alternative


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 12kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
Quote
 F1p
(@f1p)
Estimable Member Member
Joined: 7 months ago
Posts: 114
16/01/2026 10:04 pm  

Mode Restriction

For ease, let's assume you have no schedule and hot water runs purely on meeting the temperature drop parameter
Say you have just finished running hot water up to setpoint and then you run a bath, immediately dropping the temperature back down
As Hot Water takes priority over heating, this duration will block the unit from starting the hot water re-heat immediately, but wait the duration of this timer to give some time allocated to Heating.

Recharge

My understanding is by selecting "Large" it gives the ability to utilise both an Upper and Lower Hot Water tank Thermistor (THW5A and THW5B) - typically installed on 250li or larger tanks
For "Standard" only one Thermistor is installed (THW5B) - typically for tanks under 250li



   
ReplyQuote
 DavidAlgarve
(@davidalgarve)
Reputable Member Member
Joined: 2 years ago
Posts: 244
Topic starter 16/01/2026 10:57 pm  

@f1p Thank you very much for the information - most useful!

Regarding “Recharge”, I only have one thermocouple fitted and it is in the lower socket now, but I believe a recent contractor repositioned it to use the upper one for a ground connection!

Would the FTC6 automatically sense a second thermocouple, or would it be a dip switch setting? It would be quite useful to have the option.

As it is currently, there is no facility to change this setting.


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 12kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
ReplyQuote
 F1p
(@f1p)
Estimable Member Member
Joined: 7 months ago
Posts: 114
16/01/2026 11:19 pm  

@davidalgarve 

I have never made a conversion from standard to large personally, I presume you Service > Thermistors page already shows THW5A (upper sensor) option 

I don't see any references in the FTC manual regarding dip switches for this option so I suspect it's done in software at that Recharge menu option 



   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

Join Us!

Latest Posts

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