HP Modular Cooling System Site Preparation Guide

Another consideration for water is the required set point. Temperatures near or below 32°F (0°C)

mean the chilled water plant condenser is very close to or below the freezing point of the water

(remember, the minimum chilled water temperature to be supplied to the MCS is 41

F/5

C). This

could cause a blockage and damage to the unit so an additive like glycol may be necessary to

lower the freezing point, however the heat transfer potential of the water is lower so proper

equipment capacity derating would need to taken into account.

In a cooling loop, metallic materials in a pipe distribution network are in constant contact with re-

circulating liquid and can react with impurities to cause corrosion that can develop into leaks or

form deposits that can develop into blockages.

The rate of galvanic corrosion depends on the electrical potential between the two dissimilar metals

and the temperature of the liquid.

NOTE:

A 10° C rise in water temperature can double the rate of corrosion.

Addtitional Water Precautions

The following actions should be taken during the installation of the HP MCS:

• Ensure that all foreign matter and particulates are flushed from the system prior to installing the

water kit for the HP MCS.

• Evaluate the short- and long-term system requirements, versus available water capacity.

• Ensure your chilled water loop is properly designed for liquid cooling systems, separate from the

sanitary water systems within your building (e.g., bathroom, sink or drinking water).

• Make sure facility managers understand the additional load being added to the building’s chilled

water supply. Be aware that the heat load being added may have an effect on other components

being cooled by the chilled water plant.

CAUTION:

It is important that the water supply system feeding the HP MCS is

capable of withstanding deadheading (operating with a closed line)

and operation with rapid and frequent changes in flow requirements,

including long periods of time with zero water flow.

Plumbing Materials To Avoid

The following materials should not be used with a closed water system:

• Oxidizing biocides

• Aluminum components

• High zinc/brass components

• Non-stainless steel iron components

HP MCS Site Preparation Guide