6.2.6 Fluid Checks
• Take secondary circuit fluid sample as directed by fluid management partner and send to approved lab for
analysis and report recommendations.
• Take action on any previous fluid report recommendations.
• Check supplementary filling operation and manual override if not automatically engaged when taking fluid
sample.
• Check makeup reservoir tank is full, properly connected, and that the breather cap is functional.
• Record secondary fluid filter DP readings (PS5a and PS5b difference with PS2).
• Isolate, remote, and clean fluid filter(s) if necessary, and record new readings.
• Record primary fluid filter DP readings (PS3 difference with PS4).
• Isolate, remove, and clean primary fluid filter if necessary and record new readings.
6.2.7 Functional Checks
Functional checks may require unit shut down.
• Check controller and display firmware status and upgrade if necessary.
• Carry out audible/visual checks on operational pump.
• Override operational pump speed to 100% and record temperature, current, and voltage.
• Override primary control valve to 100% and note feedback signal correponds.
• Check all cable connections and terminals for signs of damage or loose wire connections.
6.3 Primary Filter Service (if Fitted)
The primary filter may be removed and cleaned while the unit is running. Follow this procedure:
1. Open bypass valve A to position as shown in Figure 7.1 on the facing page .
2. Close filter isolation valves B and C to positions shown in Figure 7.1 on the facing page .
3. Open the air vent on top of the filter elbow.
4. Drain fluid from the filter housing using drain valve and drain hose on underside of filter.
5. Once drained, under the clamp ring, then withdraw the cap and filter screen using the T handle provided
6. After the fluid is drained, undo the clamp ring. Withdraw the cap and filter screen using the T handle provided out
through the front of the unit.
7. To clean the filter, rinse with DI water or PG solution and then let drip dry.
8. Replace by reversing this procedure. Ensure that the drain valve is closed first before re-opening valves B and C
and closing valve A.
70 Proprietary and Confidential ©2025 Vertiv Group Corp. 6 Maintenance
Vertiv™ CoolChip CDU 600 Operation and Maintenance Guide
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