Vertiv CoolPhase CDU - Page 94

Symptom Possible Cause Check or Remedy
Pump noisy
Air in the system Purge air from high point vent on the top of unit.
Cavitation due to vapor
in pump
Check for adequate charge in system, see Filling and Flushing Secondary Fluid Circuit on
page72 .
Worn motor bearings Replace pump.
Pump is rotating in
reverse.
Check wiring phase.
Pump suddenly stops
Loss of power
When power is restored, the Vertiv™ CoolPhase CDULiquid to Air Cooled Chiller
automatically restarts.
Clogged strainer or
impeller
Clean out the debris.
Pipe rattle Loose pipe connections Check pipe connections.
Return water temperature high
Low fluid flow
Check alarm history for related alarms.
Clean strainer.
Check pressure drop of hose set and connected load.
Check flow meter.
Room temperature too
high
Reduce room temperature.
Economizer Pump/compressor
will not energize
No main power. Check L1, L2, and L3 for rated voltage.
Loose electrical
connections.
Tighten connections.
Incorrect phase wiring. See Electrical Installation Checks on page86 .
Local display is not operational,
but unit operates
Local display cable
disconnected
Connect cable.
Local display cable
damaged.
Replace cable.
Local display
configuration is lost.
Contact Vertiv Technical Support.
Local display is not operational
and unit does not operate
Unit electrical supply is
off
Restore electrical supply.
Unit main switch is off. Switch the unit on.
Control board supply
issues.
Contact Vertiv Technical Support.
Control board issues. Contact Vertiv Technical Support.
Air in the system.
Check for adequate charge in system. See Filling and Flushing Secondary Fluid Circuit on
page72 .
Vertiv™ CoolPhase CDU not
making capacity.
Incorrect refrigerant
charge.
Check charge per conditions referenced inTable 5.11 on page57 .
Table 10.1 Unit Diagnostics (continued)
88 Proprietary and Confidential ©2024 Vertiv Group Corp. 10 Troubleshooting
Vertiv™ CoolPhase CDU Installer/User Guide