User's Manual

Piping
Liebert
®
DCP
™
20
3.6 Piping Details—Shutoff/Isolation Valves
Isolation valves must be installed on the Liebert DCP’s secondary chilled water circuit to permit
maintenance on the unit (see
Figure 20).
Figure 20 General piping details
3.6.1 Insulation
Insulate all piping between the Liebert DCP and its connected cooling modules to prevent
condensation where the piping passes through non-conditioned areas.
3.7 Filling Instructions
This section provides detailed instructions on how to properly fill the Liebert DCP.
3.7.1 Check for Proper Installation of Components and Workmanship
1. Confirm that the flow directions of field-installed components are correct.
2. Confirm that all isolating valves are open (keep the hose bib valve closed when filling).
3. Confirm that all auto air vents are closed (tighten caps if applicable).
4. Test the water quality when filling the system. Refer to the values in Table 2 for minimum
corrosion and erosion.
3.7.2 Conduct Air Pressure Test
1. Turn Off power to the unit.
2. Set the pressure at 150 psig (1034kPa; 10.3 bars) maximum for at least 30 minutes or according to
local codes.
3. Repair any leaks if necessary.
NOTE
Do not insulate piping before checking it for leaks. Insulating pipes before checking them for
leaks would prevent easy detection of leaks.
Table 2 Water quality to limit corrosion and erosion
Maximum Conductivity 500µS/cm
Minimum PH 7.0
Maximum Suspended Matter 30 mg/L; no visible particles
Taste and Smell Normal
To Building Chilled
Water Supply
Supply
Return
Emerson recommends
installing shutoff valves
as shown to permit isolating
the Liebert DCP for maintenance.