Forums

Forums
Renewable Heating
Air Source Heat Pum...
Inventor (Midea) He...
 
Notifications
Clear all

Inventor (Midea) Heat Pump short cycling advice

 
Air Source Heat Pumps (ASHPs)
Last Post by immunity 17 hours ago
1 Posts
1 Users
0 Reactions
9 Views
RSS
 immunity
(@immunity)
New Member Member
Joined: 18 hours ago
Posts: 1
Topic starter 06/09/2025 5:25 pm  

Hello, I have a Inventor (Midea) 8kW with a 800meters Φ10 pipes under-floor heating system of total ~50L water volume (there is also a magnetic filter and an electronic vavle to switch between dosmetic waters boiler and the ufh. No extra expansion vessel (just the HP's) no extra circulation pump (just HP's internal). Currently, in COOL mode (Greece 😀 )

At manifold I have the "glass things" turned full for max flow (pump after 5-6 mins run shows 1.52m³/h). I have tried everything water temp target for start/stop (T1), thermostat for start/stop (with cooling curve for water T1S C1 to 18C) but it always the pump will cool the water very much under the water temp target T1 which fire the stop or the T1S C1 temp (so thermostat is still on but compressor stops) which results in compressor running only for 5-17mins TW_O goes 17 and TW_I 20 or 21 (ΔΤ 3-4) and pump stop since it drops under the 18C even though room temp is 27 and the thermostat set temp is 24.

It supposed the heat pump's inverter would kick in and instead of overshooting to 17C temp it should slow down (decrease Watts) and run the TW_O close to 18.XC but not lower than that. I have also tried to power limit it (Midea advanced users know) to step 5 which reduce Ampers to 12 but still nothing heat pump will cooldown the TW_O below the water temp target and make the heat pump stop for 5 mins.

Only time it ran more than 20 mins was when I set water temp to 12C and it dropped the water temp to 15C and stop it to avoid develop water all over the house xD.

House in Greece (warm climate) with A+ isolation (EP<0,33Rr)

I have been told to install a 80L tank in series(2 pipes) in returning water pipes (just before reaching back to heating pump). Should that help? Is there any other configuration I'm missing that would slow down the compressor/inverter?

Thanks in advance

Below is the power consumption of the heat pump which shows the short-cycling

image
image
image

This topic was modified 17 hours ago by immunity

   
Quote
Forum Jump:
  Previous Topic

Currently viewing this topic 1 guest.

Recently viewed by users: Mars 7 minutes ago.



Share:

Join Us!

Login   Register

Podcast Picks

Latest Posts

Members Online

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →