Initial treatment for systems larger than 75.7 liters (20 gallons)
Use the following procedure to clean your system:
Note: This procedure must be performed on the cooling loop before any computer racks are connected to
the system.
1. System must be empty. If it is not empty, you must drain the system completely.
2. Remove all the lters from the lter housings.
3. Ensure that bypass hoses are connected between the supply and return manifolds of the cooling loop
to ensure the cleaning of all surfaces of the cooling loop.
4. One of the following two cleansing procedures can be used:
a. Chemical cleaning - This method is the most effective way for cleaning the plumbing loop.
1) Fill the system with demineralized water, reverse osmosis water, deionized water, or distilled
water.
2) Add the required volume of cleaning solution Nalco 2567 according to the manufacturer
recommendation.
3) Circulate the cleaning solution for a minimum of 4 hours.
4) Drain the system completely utilizing all drain ports available, disposing of the cleaning
solution according to local regulations
5) Rell with demineralized water, reverse osmosis water, deionized water, or distilled water.
6) Circulate the water for 1 hour.
7) Drain the system completely utilizing all drain ports available, disposing of the cleaning
solution according to local regulations
8) Rell with demineralized water, reverse osmosis water, deionized water, or distilled water.
9) Circulate for 15 minutes.
10) Immediately proceed to the inhibitor dosing procedure.
b. Cleaning with deionized water. This procedure can be used if the cleaning chemical cannot be
obtained or if local laws prevent the disposal of the chemicals.
1) Completely ll the system with demineralized water, reverse osmosis water, deionized water, or
distilled water.
2) Deionize the water by bypassing some of the water flow through the deionizing cartridge or
cartridges and circulate the water normally through the complete system until the resistivity of
the water increases above 1MΩ cm.
3) Proceed to the inhibitor dosing procedure.
Use the following procedure for chemical dosing:
Note: The dosing procedure for systems larger than 75.7 liters (20 gallons) is the same regardless of the
cleaning technique.
1. Install a new or cleaned 50 μm lter in the lter housings.
2. One of the following two dosing procedures can be used:
a. If the system was cleaned by using cleaning solution Nalco 460-CCL2567 or Nalco CCL2567 and if
at the end of the “Initial treatment for systems smaller than 75.7 liters (20 gallons)” on page 164
procedure, the system was empty with no water in it, complete the following steps:
1) Fill the coolant reservoir with Nalco 460PCCL100 / Nalco CCL100. Add 120 ppm of Nalco
3DT-199 to raise the azole concentration to 40 ppm.
2) If bacteria or fungi is suspected or is a serious concern, add one of the following biocides:
• 100 parts per million (ppm) of Nalco H-550 (glutaraldehyde)
• 200 ppm of Nalco 73500 (glutaraldehyde)
166
Power Systems: Racks and rack features
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