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COOLPHASE CDU & LIEBERT® XDM
BRAZED PLATE HEAT EXCHANGER
REV : C
REV : 08/2024
DPN001040_REV6
Table 1: Propylene Glycol Values
SECONDARY LOOP GLYCOL AND WATER REQUIREMENTS
For applications when the outdoor winter design temperature is below -18°F (-27°C), use a percentage of glycol per the appropriate table
below or contact your Vertiv Sales Representative and Application Engineer. The percent glycol solution values listed below in Tables 1 and 2
are for reference and are based on burst protection of the Brazed Plate Heat Exchanger (BPHE) at various outdoor winter design
temperatures. This outdoor winter design temperature should be the coldest expected temperature to ensure continued operation of The
Liebert® XDM product. The recommended percent values listed below are based on the Dowfrost HD (Propylene Glycol) and Dowtherm SR-1
(Ethylene Glycol) chart. If the coldest outdoor temperature does not drop below -18°F (-27°C), water is an acceptable fluid in the Liebert®
Secondary Loop. If the Secondary Loop is using a coolant other than water, contact your Vertiv Sales Representative and Application
Engineer.
Recommended % PG by Volume Recommended % PG by Mass
Down to 15 (-9) 20 21
Down to 5 (-15) 25 26
Down to -15 (-26) 30 31
Down to -30 (-34) 35 36
Winter Outdoor Design Temperature °F (°C)
Secondary Side
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