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Mitsubishi Ecodan FTC6, Evohome & Economy 7. Getting Two Zones to Work Together

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 53 minutes ago
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 Davispj3
(@davispj3)
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Joined: 1 hour ago
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Topic starter 07/05/2026 9:01 am   [#2986]

My system set up is a mitsubishi ashp and — Ecodan FTC6, two zones, evohome with 2 x BDR91, and Economy 7 tariff.  To work efficiently.
1. Which zone should be Zone 1 (UFH or radiators)?
2. How does the BDR91 evohome signal interact with their MELCloud commands — do they conflict?
3. How should I set evohome zone 2 (whichever they don't control) given the same flow temp limitation?


This topic was modified 1 hour ago by Mars

   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4814
07/05/2026 9:23 am  

Posted by: @davispj3
↑

My system set up is a mitsubishi ashp and — Ecodan FTC6, two zones, evohome with 2 x BDR91, and Economy 7 tariff.  To work efficiently.
1. Which zone should be Zone 1 (UFH or radiators)?
2. How does the BDR91 evohome signal interact with their MELCloud commands — do they conflict?
3. How should I set evohome zone 2 (whichever they don't control) given the same flow temp limitation?

Lets step back.  Why do you need/want 2 zones?  The heat pump, just like a boiler, can only supply water at a single flow temperature at any one time and its generally best to operate 'low and slow' so that as much emitter area is active as possible thus allowing the minimum flow temperature for any given energy output (ie heat loss).  

If you could explain the rationale for two zones and say a bit about your house (floor area, any notable layout features - eg a house split into two etc) I or others will be able to give a more focussed response. 

In answer to the question - do the external controls conflict with the Mitsubishi controller, yes very likely unless the control strategy has been well thought through.  Its generally best to avid external controls altogether unless they are specifically designed to control the flow temperature of the heat pump.

 


This post was modified 51 minutes ago by JamesPa

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.


   
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