What is "Cooling enable" bit?

[sskriblo]

Hello,
May be someone has answer regarding to the OT standard V.2.2. What means "Cooling enable" bit at the ID=0 packet?
This is at the page 24 here: uploaded/Ard%20M/Opentherm%20Protocol%20v2-2.pdf and at some more places (ID=3, 7)

Any information will be appreciated!
Regards,
Sergey

[Rene]

I think it is for controlling a device that is able to cool in addition to heat.