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Propylene glycol is run alongside the beer lines to keep things cool. Here's an example of a chiller we use and how things work.
The chiller requires a dedicated circuit, and can go in or out of the walk-in cooler. It is not recommended to go on top of the cooler.
0:27 glycol overview
0:59 how the system works
1:21 two-product glycol trunk line
1:41 eight-product beer trunk line + how the glycol circulates
2:30 dispenser trunk line
3:25 typical chilling length + amount of beer being chilled
4:12 glycol pump key
4:34 sight glass + reservoir access
5:00 chiller manual + maintenance