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Ecodan new build install - zoning question

Air Source Heat Pumps (ASHPs)

Last Post by darlomrh 2 months ago

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darlomrh

(@darlomrh)

Active Member Member

Joined: 2 months ago

Posts: 6

Topic starter 15/02/2026 9:34 am [#2825]

Hi apologies, if this is a duplicate post. We have newly purchased a new build that has a Ecodan R32 ASHP.

FTC is in the cupboard with all the tanks and has 1 wireless controller downstairs and 1 wireless controller upstairs.

The system has been configured as 2 "zones" and a wireless controller assigned to each. Am I correct in thinking that the way Ecodans work in this situation is that zone 1 sets the whole house temp and zone 2 allows you turn off the rads in that zone if you are too hot but not call for heat ie set a temperature higher than the zone 1 temp if you are too cold?

Thanks in advance

This topic was modified 2 months ago by Mars

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ASHP-BOBBA

(@ashp-bobba)

Honorable Member Member Professional Installer

Joined: 1 year ago

Posts: 444

15/02/2026 11:41 pm

@darlomrh, not quite, it is normal to set the unit up so that each wireless stat can energise the Ecodan and run any single zone, usually there would be an S-plan valve actuated, this will be in place to prevent migration when zone is not needed.

This is a classic setup but the designer needs to be sure each zone can reach the minimum flow and output of the ASHP lowest output to prevent unwanted cycling and allow minimum volume for defrost. The minimum water volume may be satisfied by a volumiser in this case but it will not prevent the short cycling if the circuit cannot dissipate the minimum output of the ASHP when a small amount of heating is required.

Hopefully they designed your ASHP somewhere near 20-30W/m2 so its not over sized and can cope with the zoning assuming your new build is built to the latest energy standards.

This post was modified 2 months ago 2 times by Mars

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.

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darlomrh

(@darlomrh)

Active Member Member

Joined: 2 months ago

Posts: 6

Topic starter 16/02/2026 9:08 am

Thanks for the reply. I hope this the case. I think it's a case of just finding the sweet spot for the house.

It's been a confusing start, when we first had the house, no matter how high we had the setpoint on the downstairs RC, no heat in the rads. Turned out that the RC downstairs was controlling the upstairs zone so it was 24c upstairs by the time we went to bed. We had the installers out to fix that.

Currently
RC1 is set for Zone 1 temp and Zone 1 Programme
RC2 is set for Zone 2 temp and Zone 2 Programme

The thing that is confusing me and it's probably a perception thing. RC1 is upstairs and RC2 is downstairs.

Picture from Melcloud home (I had no choice when I registered my equipment, Melcloud couldn't find the big white unit so I had to use MCHome ) I don't think this helps the perception.

This post was modified 2 months ago by darlomrh

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