Liebert Challenger ITR - Manual (Page 37)

Glycol/GLYCOOL-Cooled Models
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5.5.3 Filling the System
Installation of hose bibs at the lowest point of the system is recommended. When filling a glycol sys-
tem keep air to a minimum. Air in glycol turns to foam and is difficult and time-consuming to remove.
(Anti-foam additives are available and may be considered.) Open all operating systems to the loop.
With the top vent(s) open, fill the system from the bottom of the loop. This will allow the glycol to
push the air out of the top of the system, minimizing trapped air. Fill to approximately 80% of calcu-
lated capacity. Fill slowly from this point, checking fluid levels until full.
NOTE
For glycol solution preparation and periodic testing, follow manufacturer's recommendations.
Do not mix products of different manufacturers.