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ASHP Commissioning: What Questions Should I Ask the Installer?

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Trusted Member Member
556 kWhs
Joined: 10 months ago
Posts: 27
Topic starter  

All being well my Vaillant 12kw Arotherm Plus will be getting commissioned on Monday. Other than ensuring the installation is promptly registered for the warranty by the installer what sort of questions should I be asking? (either generic or Vaillant specific) 

I've already got down on my list in my head to take some photos of the 'plant room' prior to the lagging going on the internal pipes (is located in an unheated garage)  

Thanks in advance!

Illustrious Member Moderator
13948 kWhs
Veteran Expert
Joined: 3 years ago
Posts: 4196

You need to ensure that your system is set to operate with weather compensation.

If there is a section within the manual where installer settings can be recorded then ensure that all the settings are recorded.

Your installer should show you how to operate the system, but you should also ensure that you are shown details of how to make adjustments to improve efficiency.


This post was modified 4 weeks ago by Mars

Trusted Member Member
556 kWhs
Joined: 10 months ago
Posts: 27
Topic starter  

@derek-m thanks - will look out for the point regarding the manual having an area to record the set points. Looked like there was a box full of paperwork / manuals I will inherit for all the components of the overall system. 

Will be interesting to see what their initial suggested heat curve is (have had a play around with an online calculator so I have my own opinion). The designer was very patient when we were having back and forth discussions on which rads to swap, at which sizes, based on achievable flow temps. 

A shame that it sounds like the external temperature sensor is wireless (and therefore needs to be somewhere I could change the batteries in). Fitting on the north facing wall will mean that it is quite high up (given the roofline), understand that west facing is also acceptable?



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