Dissolved Ammonia (6) is produced when the Lithium Nitrate
inhibitor scavenges free Hydrogen inside the chiller. The
free Hydrogen is the direct by-product of  the corrosive attack
of the Lithium Bromide charge on the iron or steel shell of the chiller.

Further, the presence of Ammonia can cause specialized
stress corrosion cracking of the copper based tubing.
In the example, the amount of Ammonia present is minimal,
but still the possibility for stress cracking is indicated.