Danfoss AK-PC 560 User Manual page 9

DO9 function:
Inject-on function
DO9 is here used for the Inject ON function. Here all the electronic expansion valves are closed when all the compressors are stopped
and P0 > +Zone.
Wiring is carried out as shown below.
The function may however also be generated via data communication. In this way the relay output is made available for other
applications.
Boost ready function
If two controllers are to capacity regulate the high-temperature part and the low-temperature part, respectively, they must be
connected in such a way that low-temperature regulation cannot be started until the high-temperature part is operating. The signal
can be taken from DO9 of one controller and received on the ON input of the other controller.
Example:
AK-PC 560 Manual RS8GE202 © Danfoss 01-2016 9