Hi Marc.
Some of the sites I look after have tier chillers running all year round despite the ambient being well below their design parameters.
Extreme I know but as they say "That's Life"!
I would be interested to know which Airedale that was as they have 2 different selectable control strategies.
Add this to their free cooling units and it can get interesting.
No disrespect to Airedale, theirs is some good kit, Only even theirs don't like all ambient conditions.

Grizzly