7. Before running the whole system, the following tasks must be completed.
• Clean/flush external supplied water load banks with clean fluid (per the fluid quality guidelines) at the
proper proportion of the design flow rate before placing them into the Vertiv™ CoolPhase CDU secondary
circuit. For example, if total design flow rate is 320 gpm (1211 Lpm) for 1 MW, and the load banks are 250
kW each, divide 320 by 4 and flush each load bank with 80 gpm (303 Lpm).
• Flush the secondary fluid circuit per Secondary Fluid Circuit Requirements on page61 .
• Requires 40 mesh strainer. Refer to Table 3.1 on page21 .
• The secondary fluid circuit must be filled per the guidelines in Secondary Fluid Circuit Requirements on
page61 .
• The secondary fluid circuit must be charged with the approved fluid and the secondary circuit fluid
temperature must within +/- 9°F ( 5°C) of the operating point.
8. If the operating point changes, the charge may need to be adjusted according to the new operating point.
9. The return secondary fluid temperature to the CoolPhase CDU is being charged it must be stable. If this is not
possible due to the lack of heat load, then additional load banks must be used to offset the cooling load during
start-up.
NOTICE
The unit must have line voltage applied to the unit at least 12 hours before compressor start-up to allow the
compressor crankcase heaters time to warm the compressors and boil off any liquid refrigerant in the
compressors after pre-charge.
10. In the Service menu of the Vertiv™ Liebert® iCOM™ controller, select Diagnostics/Service > Diagnostics.
a. Enable Manual Mode.
NOTE: Manual mode will time out after 60 minutes.
b. In the Search Box type E177 and press Enter.
Two parameters appear in the Parameter Directory (E177.1 and E177.2).
Press the gear icon in the upper right corner.
Select Make Writeable.
Change E177.1 and E177.2 from five minutes to two minutes.
This will reduce the superheat setpoint from 24°F (13.3°C) to 13°F (7.2°C) degrees in two minutes.
c. In the Pump options, set Pump to On to operate the pump during Manual Mode.
d. It is recommended to start with setting the Vertiv™ CoolPhase CDU pump speed manually to operate at
100 ± 5 gpm (303 ± 19 Lpm) with approximately 250 kW of load to charge both circuits simultaneously, or
50 ± 5 gpm (151 ± 19 Lpm) with 125 kW of load for one circuit at a time.
e. It is best to charge both circuits simultaneously since sub-cooling values need to be confirmed on both
circuits once charging is complete. If you wish to charge one circuit at a time, Table 5.11 on the facing
page provides a target sub-cooling value. However, the target sub-cooling value for two circuits running
should be verified as well once both circuits are charged.
NOTE: Adjust the load as needed to maintain the customer’s desired supply fluid temperature ±9°F (5°C).
f. In Compressor Circuit 1 options, set the Compressor Mode to Charge to operate Compressors 1A and 1B at
full capacity. Turn Compressor 1A and 1B to On. The EEV will modulate to control superheat setpoint.
g. Reset the charge function as many times as needed to complete unit charging.
56 Proprietary and Confidential ©2024 Vertiv Group Corp. 5 Refrigerant Piping Requirements
Vertiv™ CoolPhase CDU Installer/User Guide
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