Attention: The overpressure safety device must meet the following requirements:
v Comply with ISO 4126-1. For more information, go to the ANSI Standards Store
website (webstore.ansi.org/default.aspx), and search on document number ISO
4126–1.
v Be installed so that it is easily accessed for inspection, maintenance, and repair
v Be connected as close as possible to the device that it is intended to protect
v Be adjustable only with the use of a tool
v Have a discharge opening that is directed so that discharged water or fluid does
not create a hazard or directed toward any person
v Be of adequate discharge capacity to ensure that the maximum working pressure
is not exceeded
v Be installed without a shutoff valve between the overpressure safety device and
the protected device
Figure 24 on page 81 shows a typical cooling solution and identifies the
components of the primary cooling loop and secondary cooling loop.
Figure 23 on page 80 shows an example of a fabricated facilities solution. The
actual number of heat exchangers that are connected to a secondary loop depends
on the capacity of the cooling distribution unit that is running the secondary loop.
Figure 21 on page 78 shows an example of an off-the-shelf modular cooling
distribution unit. The actual number of heat exchangers that are connected to a
secondary loop depends on the capacity of the cooling distribution unit that is
running the secondary loop.
Figure 22 on page 79 shows an example of a water-chiller unit that supplies
conditioned water to one or more heat exchangers. This water-chiller unit must be
a closed system (no exposure of the water to air) and meet all materials, water
quality, water treatment, and temperature and flow specifications that are defined
in this document. A water chiller unit is considered an acceptable alternative to use
as a building chilled water source for removing heat from the rear-door heat
exchanger.
Chapter 10. Planning for the rear-door heat exchanger 77
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