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Please help with the settings ecodan

 
Air Source Heat Pumps (ASHPs)
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 nose1972
(@nose1972)
New Member Member
Joined: 2 days ago
Posts: 1
Topic starter 11/01/2026 1:54 pm  

I have a 160 square meter house, first floor 6 radiators and second floor 4 radiators. The pump is a puhz-sw100yaa. I have a 100l buffer tank and a secondary pump. I am interested in the pump speed on the ftc 6, it has from 1 to 5. Mine is at 2 with a flow rate of 20l/m. Is that ok or should I increase or decrease the flow rate? Which is better?



   
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 Sheriff Fatman
(@sheriff-fatman)
Reputable Member Member
Joined: 9 months ago
Posts: 174
11/01/2026 6:30 pm  

Hi and welcome to the forums.

Does your system use a Mitsubishi cylinder or is it a 3rd party one?

The FTC6 settings from 1-5 only work on Mitsubishi cylinders, so have no effect on 3rd party ones (which I discovered only because someone on here told me).

If you increase it to 3 or 4, for example, does the flow rate change?  If not, then there's probably a manual pump controller somewhere that will do this.

You should be able to find a databook for your model that provides information on the recommended flow rates.  I did a quick search and found a service manual that stated a nominal flow rate, but the unit should operate within a range.  The nominal rate shown was 32.1l/min which suggests yours might be at the low end of the range.  I found my relevant databook within Mitsubishi's site, but had to search for installer data rather than customer data to find it, but hopefully this gives you a start point.

Screenshot 2026 01 11 182513

 


130m2 4 bed detached house in West Yorkshire
10kW Mitsubishi Ecodan R290 Heat Pump - Installed June 2025
6.3kWp PV, 5kW Sunsynk Inverter, 3 x 5.3kWh Sunsynk Batteries
MyEnergi Zappi Charger for 1 EV (Ioniq5) and 1 PHEV (Outlander)
User of Havenwise (Full control Jun-Dec 2025, DHW only from early Dec)
Subscriber to MelPump App data via CN105 Dongle Kit


   
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