My guess is that "Engie" is an abbreviation for "Energie", meaning the energy supplied to the various systems

Due to the age of the chiller it was not possible to refurbish
the old R22 system at Nordmark; this would have been an
unwise choice with regards to the costs - here a new refrigeration
solution had to be found. A refrigeration container
from ENGIE Refrigeration that completely replaces the R22
refrigeration system as of May 2015 was quickly installed,
ensuring safe cooling of the production processes on a permanent basis.
...
The container consists of two rooms: the machine room and
the control room which houses the entire electronics. The
gas warning system is also integrated there, as well as a
cabinet for the personal protection equipment such as gas
masks. The advantage of this 2-room concept is obvious:
Persons entering the control room do not need special instructions
in dealing with the refrigerant NH3. This is due to the
fact that the machine room can be accessed through a separate
door; in addition, there is a double folding door in the
rear side for revision purposes.

https://www.engie-refrigeration.de/export/sites/cofelyrefrig...

"Installation" is okay -I personally like positioning better in this context, because of the other components that are mentioned.