Asetek InRackCDU Installation, Operation & Maintenance Guide 23
Facilities Water Quality Requirements:
The requirements for the facilities loop are site specific and generally beyond the scope of this document,
however, the facilities loop must utilize cooling water that meets or exceeds the water quality standards
in ASHRAE’s Liquid Cooling Guidelines for Datacom Equipment Centers, Third Edition, herein after “ASHRAE
D-90564” and some additional requirements.
Parameter
Value
Incl. in ASHRAE D-90564
pH
7 to 9
Yes
Corrosion Inhibitor(s)
Required
Yes
Sulfides
<10 ppm
Yes
Sulfate
<100 ppm
Yes
Chloride
<50 ppm
Yes
Bacteria
< 1000 CFUs / ml
Yes
Total Hardness
<200 ppm (as CaCO3)
Yes
Residue After Evaporation
<500 ppm
Yes
Turbidity
<20 NTU (Nephelometric)
Yes
Glycol concentration
Max 38%
Yes
Total Hardness
< 100mg/L. Calcium (Ca) and Magnesium (Mg)
Total Organic Carbon (TOC) <25 mg/L
Suspended Solids (SS)
<25 mg/L
Iron (Fe)
<10 mg/L
