4 way valve functionality request

[CarloContu98]

Hello, I'm creating an issue ticket since I didn't find any way to contact you directly, but it's really more a request than an issue.

I've recently bought an old house with my gf and I'm trying to renovate everything by myself.
For the domestic hot water I'm using a refurbished 500 liters boiler where I submerged a copper-pipe-spiral that acts as a condenser.
But for the evaporator side I can't implement the ground loops yet, so I'm using an air unit.
Therefore I need to implement the 4 way valve, to de-ice the external unit.

I've already ordered and built your board, which I really like in quality instead of the stuff from Aliexpress and similar products, but I'm struggling to edit the code myself to add the 4 way valve functionality.
I would love if you could help me implement it, even under payment or donation to the project of course.
I thought about using the "hot side recirculation" relay to command the 4 way valve since my hot side is passive and don't need recirculation.

In await for your response, best regards,
Carlo Alberto

[burner-]

De icing is much more than just 4 way valve. Proper deicing measure outdoor ambient temp. Under set point it star compare evaporator and ambient temp. If evaporator - ambient temp delta goes too high it star de icing cycle. At that sycle compressor needs to stop and after some while fan need stop. Then 4 way valve turn, compressor start after oil settle time as evv closed position. When max pressure is achaived evv will open. That cause huge temperature rush to evaporator. Unit measure de icing time and temperature when minimum time and requested return gas temperature is achived (probably something like +15c is proper) it start outdoor fan with full power and stop compressor. That will blow droplets away. After that fan stops, evv open and back pressure got released. After that 4 way valve return back to heating position, compressor idle timer wait that oil settle and after that normal compressor start sequency start.

[Sniffer-Daniel]

I am also interested in an update specifically for de-icing. It would be very nice if such an update to the code was made. I am currently rebuilding a 9kw(copeland zh30k4e) air/water heat pump for this particular system (Valden heat pump controller).

My name is Daniel and I am from Sweden. :)