Which ASHP are set up to cool

[davidh72]

https://www.theheatxchange.co.uk/vaillant-plug-coding-vai0020266328

 

And talked to an installer who says it seems to work fine.

[JamesPa]

17 hours ago, LiamJones said:

Just ordered the £5 VAI0020266328 plug. Thanks to those on this thread 🥵

I can confirm it worked on mine.

 

There are a few obscure settings, most notably one about power company lock out, that need to be adjusted in the installer menu to get it working whether you have the part with the official part number or the one you refer to above.  Openenergymonitor has a thread about this

[JohnMo]

2 hours ago, JamesPa said:

I can confirm it worked on mine.

 

There are a few obscure settings, most notably one about power company lock out, that need to be adjusted in the installer menu to get it working whether you have the part with the official part number or the one you refer to above.  Openenergymonitor has a thread about this

Why do people bother with heat pumps that do not cool out the box? That is the only reason I bought mine.

[JamesPa]

11 minutes ago, JohnMo said:

Why do people bother with heat pumps that do not cool out the box? That is the only reason I bought mine.

In my case

 

because the Vaillant was one of a very few that was a good fit to the many constraints,

 

because I mostly have radiators with only one fancoil (I now wish I'd specified a couple more fancoils) so cooling was a anyway secondary consideration (sofaik it doesn't work with standard radiators because all the cold water just collects at the bottom so even if you add a fan there is insufficient surface area to make much difference),

 

because I knew that it was capable of cooling and that the coding plug was available in Germany for about gbp40,

 

and finally because I can alternatively keep my house cool even in summer by the low tech approach of closing the curtains. 

 

I wouldn't have purchased one that was incapable of cooling unless there was no alternative.

Edited May 14, 2025 by JamesPa

[Duncan62]

https://www.theheatpumpwarehouse.co.uk/shop/heat-pumps/air-source-heat-pumps/samsung-heat-pumps/samsung-ehs-gen-7-r290-heat-pump-5kw/

 

Will this Samsung Gen7 cool out of the box?

Edited June 10, 2025 by Duncan62

[yngndrw]

40 minutes ago, Duncan62 said:

https://www.theheatpumpwarehouse.co.uk/shop/heat-pumps/air-source-heat-pumps/samsung-heat-pumps/samsung-ehs-gen-7-r290-heat-pump-5kw/

 

Will this Samsung Gen7 cool out of the box?

It appears so as the manuals and datasheet reference cooling. It also shows the required reversing valve in the refrigeration schematic. The installation manual also documents how to wire up an extra valve to shut off an underfloor heating circuit during the cooling mode.

 

I couldn't say for sure if it just works out of the box or if it needs something extra; certainly Vaillant is quite quiet about the need for the "special" module. I can however confirm that the hardware is there for it.

[martian]

The warm weather this week has got me thinking about looking into trying to work out the issue with getting our Vaillant AroTherm Plus cooling the UFH for this summer. Installed the correct resistor last year, made all the changes to activate cooling but to no effect. We have one zone and four separate thermostats which can individually call for heating when required. Should the thermostats be turned off completely as setting the required temperature to say 15 deg doesn't seem to activate cooling mode, despite the cooling symbol being displayed on the controller? Any other thoughts (or useful links) gratefully received.

[JohnMo]

If they are heat only thermostats, and not settable to cooling mode, you need to fudge the system to think there is a call for heat. So you need turn up to a high temperature.

 

If your thermostats can do cooling you need to set to cooling mode. 

 

But you controller may fight against you depending on how that interacts. With a Valiant you would be better doing everything through the controller and not the third party thermostats for heat or cooling.

 

There are other threads on here that discussed the same issues

[davidh72]

I use my vaillant for cooling with heatmiser stats. I just manually turn them up to a high temp so say 30 degrees then have the vaillant cooling only set and off it goes. Watch out for other settings such as turn off system when outside temp is above X, as that will still turn the entire system off.

[martian]

1 hour ago, davidh72 said:

I use my vaillant for cooling with heatmiser stats. I just manually turn them up to a high temp so say 30 degrees then have the vaillant cooling only set and off it goes. Watch out for other settings such as turn off system when outside temp is above X, as that will still turn the entire system off.

Thanks for this. We also have heatmiser stats and I guessed that I needed to get them to 'ask' the ASHP to do something. Thanks as well for the heads up on checking the other settings.

[JohnMo]

Watch your flow temperature, your Vaillant is likely to give long run times, so set to a fixed flow temp, no lower than 16 to 17 degs, otherwise you may get dew point related issues - assume UFH, not direct to fan coils.