VII. Installation: Glycol Mixture, Filling
Glycol Mixture
Purpose: Glycol is required to resist freezing. Freezing risk is not only relevant in cold ambient
conditions. The evaporator in the refrigeration circuits can get cold enough that there is freezing risk.
Glycol type: Use pure, lab-grade glycol. Haskris strongly recommends propylene glycol. For example,
DOWFROST is a common brand. Ethylene glycol is acceptable but not recommended because it is
toxic.
Water type: Use potable distilled water.
Mixture: Use a refractometer to verify glycol mix percentage of 35-40%.
Volume: Use the table below to estimate how much water and glycol fluid will be needed. Haskris is
available to review pipe runs and make recommendations for individual sites.
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