Glycol Chiller.
121,100 BTU/HR. I am not an expert on chilling capacity, but an online conversion tells me that this is 10 tons. Please check this detail if specific tonnage of chilling capacity is important to you.

I contacted the servicing company and they sent me this:

Chiller Systems MODEL GCLT240B121KCK3
Chillking

SPECIFICATIONS:
- Low temperature chiller
- 121,100 BTU/HR at 90F degree ambient and 28F degree water out
- Electrical: 208/230V, 60hz three phase
- Minimum Circuit Ampacity: 91, Maximum Fuse Size 125 Amps
- One 137 gallon stainless steel tank with Chillking evaporator coils inside
- 1-1/2 HP water pump: 59 GPM max, 51 PSI max
- R410a Refrigerant
- Two 120,000 BTU/HR Copeland scroll compressors
- Approximate shipping weight 2,400 LBS
- Dimensions: 88-1/4" wide, 133-1/2" long, 50-1/2" tall
- Decibels: 88
MODEL GCLT240B121KCK3