Vertiv CoolPhase CDU - Filling and Flushing Secondary Fluid Circuit; Flush the Secondary Row and Rack Manifold Without IT Equipment

To safeguard the maximum lifetime of the secondary fluid system, the coolant used for cooling purposes must meet the
ASHREA standards .
The coolant used must be soft enough to prevent deposits, but it must not be too soft because that would lead to corrosion in
the water system.
Water/glycol solutions have different requirements. As stated in the notice in Secondary Fluid Circuit Requirements on
page61 a local water treatment specialist could be consulted.
Table 7.8 below , lists the most important impurities and measures for their removal.
Parameter TCS (Table 6.2, ASHRAE 2014)
pH 8.0 to 9.5
Corrosion inhibitor(s) Required
Biocide Required
Sulfide <1 ppm
Sulfate <10 ppm
Chloride <5 ppm
Bacteria <100 CFUs/mL
Total hardness (as CaCO3) <20 ppm
Conductivity .2 to 20 micromho/cm
Total suspended solids <3 ppm
Residue after evaporation <50 ppm
Turbidity <20 NTU (Nephelometric)
Table 7.8 Water Quality Guidelines for the TCS
7.4 Filling and Flushing Secondary Fluid Circuit
The piping must be filled prior to operating the pumps to avoid damage to the pump and pump seals. The pump seals are
cooled and hydrodynamically lubricated by the system fluid.
The expansion tank contains a bladder that is pre-charged to 12 psig and is ready for use without adjustment.
When filling, bleed air from all vent locations until a steady stream of fluid is observed. Vent locations are provided as 1/4" SAE
flare connections at various points in the factory piping of the Vertiv™ CoolPhase CDU. Vent locations should be provided at
high points and long horizontal runs of the field piping as well.
Test the fluid quality when filling the system. Refer to Fluid Quality Requirements for Direct to Chip Applications on page1 and
Fluid Quality Requirements for Rear Door Heat Exchanger and Direct to Chip Applications on page70 .
7.4.1 Flush the Secondary Row and Rack Manifold without IT Equipment
1. Locate the fill connection shown in Figure 7.3 on the facing page in the Vertiv™ CoolPhase CDU module. Note
that each CoolPhase CDU module has its own bladder tank, so on multiple CoolPhase CDU systems you may fill
at one or more points, according to the CW piping system design.
2. Connect the fill water or glycol source to the desired fill valve. See Figure 7.3 on the facing page .
3. Open high point vents where appropriate. See Figure 7.4 on page74 .
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7 Secondary Fluid Circuit
Requirements
Vertiv™ CoolPhase CDU Installer/User Guide