Ämne: F2040 Kyla

[Adrian.rusu]

Hello

   I have a difficul situation with F2040 +SMO 20 and 2 pipes system ( fan coils ) in cooling ; the heat pump starts for cooling, BT25 senzor arinves at desire temperature , degree minutes slowly are going back to 0 , the heat pump stop and after a short period of time both pumps ( GP12 and GP10 ) stops , and there is no circulation . the setting for the circulation pump is "AUTO" , speed in waiting mode 30% .
The main problem is that the SMO 20 stops GP10 ( the circulation pump between buffer tank and fan coils ) ; during the winter GP10 was working as long as we have a heating demand .Help!!! , outside we have 32 *C

[Carl N]

Hi!
Is cooling allowed in menu 5.11.1.1?
The system needs BT63/BT64 (temperature cooling), GP13 circulation pump cooling and QN12 valv exchange heating/cooling.
How is the setup?

[Adrian.rusu]

As i mentioned it is a " 2 pipes system " not a 4 pipes system ;
You need BT64 and QN12 only on 4 pipes system .
Nibe says clearly that on 2 pipes system you do not need QN12 ( QN12 and GP13 are connected to the aditional card AXC ) ; you can not add aditional card to SMO 20 , you just can connect a 3 way valve to the AUX Output that is switching when F2040 start cooling . I can connect GP 10 insteed of the 3 way valve but when the winter will came i have to change the connection back .. . But iti is not so profesional ..
And yes cooling is enable

[Carl N]

OK, I missed that you have 2 pipes system, sorry.
I think you need to activate cooling in menu 5.2.4. 
Then you can set some moore parameters:
Menu 1.9.1 curve for cooling (change from 0), 1.9.3 min flow temp cooling, 1.9.5 GM for start cooling and time beween heating/cooling.

[Adrian.rusu]

It seems that the problem is " low condensor out - BT 12 " ; when the BT12 is below 5*C , the compressor stops and also the pumps stop .
I change the cooling minimum temperature and the cooling curve and now everything in OK .
Can somebody explain to me meaning of setting :
" delta at +20 °C "
"delta at +40 °C"
Under " indoor climate " / "advanced " / "cooling settings"

[Carl N]

Can somebody explain to me meaning of setting :
" delta at +20 °C "
"delta at +40 °C"
Under " indoor climate " / "advanced " / "cooling settings"

This delta value is a setting for the speed of circulation pump.
The pump is regulationg the speed so the differens between flow temp and return temp should be this value.
+20 °C/+ 40 °C is outdoor temp for this setting and the system interpolate so at +30 °C outdoor is delta mean value of +20/+40.