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Master & Slave Zones/Setback

 
Air Source Heat Pumps (ASHPs)
Last Post by bretix 2 hours ago
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 bretix
(@bretix)
Estimable Member Member
Joined: 3 years ago
Posts: 81
Topic starter 21/10/2025 10:40 pm  

As mentioned in other forums when 2 x 10kw grant aerona are set up with 2 controllers my system only ever seems to run from 1 pump (hp2) set up for hot water and heat only.

Hp1 is set for heat only but I've never really seen it work unless it gets really cold.

I currently have thermostat calling for heat with WC in and LWT at 35. Water flow at 45 and high hyteresis to prevent cycling . DHW set for 60 split between 1-2 hours 4x over a 24 hour period .

 

Not sure if it's the weather or the settings but I find I'm having to tweak the LWT every couple of days as the indoor temp (imo) is too high at 23-24.5 and not cooling overnight, although it's running really well at the moment it's too hot.

 

I know there's been mention of set back elsewhere but in my situation (although there is a hive set up) can I set both controllers timed?

 

For example HP1 set as zone 2 running the eco cycle for less heat (18degrees) overnight and workdays then set HP2 controller timings for comfort zone 1  (22 degrees) between the sociable hours?

 

Does anyone have experience of set ups like this?

Is it possible?

 

Or do I need to try it out and report back ?

 


This topic was modified 2 hours ago by bretix

2 10kw Grant Aerona3
Heat loss calc 16.5 kw @ -2.8 degrees
4.32 PV


   
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