IBM 1756, Руководство по установке и обслуживанию

Страница: 22 / 104

Water specifications for the secondary cooling loop
It is very important that the water that is being supplied to the heat exchanger meet
the requirements that are described in this section. Otherwise, system failures might
occur over time, as a result of any of the following problems:
v
Leaks due to corrosion and pitting of the metal components of the heat
exchanger or the water-supply system.
v
Buildup of scale deposits inside the heat exchanger, which can cause the
following problems:
– A reduction of the ability of the heat exchanger to cool the air that is
exhausted from the rack
– Failure of mechanical hardware, such as a hose quick-connect coupling
v Organic contamination, such as bacteria, fungi, or algae. This contamination can
cause the same problems as described for scale deposits.
Control and conditioning of the secondary cooling loop
The water that is used to fill, refill, and supply the heat exchanger must be
particle-free deionized water or particle-free distilled water with appropriate controls
for avoiding these issues:
v Metal corrosion
v
Bacterial fouling
v Scaling
The water cannot originate from the primary chilled-water system for the building
but must be supplied as part of a secondary closed-loop system.
Important: Do not use glycol solutions, because they can adversely affect the
cooling performance of the heat exchanger.
Materials to use in secondary loops
You can use any of the following materials in supply lines, connectors, manifolds,
pumps and any other hardware that makes up the closed-loop water-supply system
at your location:
v
Copper
v Brass with less than 30% zinc content
v
Stainless steel 303 or 316
v Peroxidecured ethylene propylene diene monomer (EPDM) rubber,
non-metal-oxide material
Materials to avoid in secondary loops
Do not use any of the following materials in any part of your water-supply system:
v
Oxidizing biocides, such as chlorine, bromine, and chlorine dioxide
v Aluminum
v
Brass with greater than 30% zinc
v Irons (non-stainless steel)
12
Rear Door Heat eXchanger V2: Installation and Maintenance Guide