Mounting/Placement - Black Box CRCW-12 User Manual

Chapter 2: Installation
Conditioned Space
Take certain steps to minimize the effects of the environment surrounding the conditioned space. This is especially important for
critical/precision room preparation (computer data centers) that require close tolerance control of temperature and humidity. The
conditioned space should be well-insulated and include a vapor barrier. The installer should ensure that the proper insulation
rating is used based on the design of the space, which was the basis for the system selected. The following table lists
recommended minimum R-value (thermal resistance values) for optimum equipment operation.
The vapor barrier is the single most important requirement for maintaining environmental control in the conditioned space. The
vapor barrier in the ceiling and walls can be a polyethylene film. Concrete walls and floors should be painted with a rubber- or
plastic-based paint. Doors and windows should be properly sealed, and a door sweep used to minimize leakage. Outside or fresh
air should be kept to a minimum (as it adds to the cooling load), while maintaining the requirement of the Indoor Air Quality
(IAQ) standard. Lack of these steps can cause erratic operation, unstable room control, and excessive maintenance costs.

2.4 Mounting/Placement

The Cold Row precision A/C system uses a frame and panel construction for unit rigidity and full-service access while the unit is
mounted in place.
NOTE: The equipment must be level to operate properly.
Cold Row cabinets are designed to be installed in a row of servers between the server racks (see Figures 2-1–2-3). They have a
compact footprint that allows the units to be placed adjacent to the heat-producing equipment racks anywhere in the row. They
provide cool, conditioned air through the front grille to the adjacent server modules on the cold aisle side of the row. We
recommend positioning the unit to obtain optimum air circulation.
The optimal placement location is next to highly loaded servers that throw off the most significant heat into the hot aisle side of
the row. In this arrangement, the Cold Row minimizes hot spots.
It is best not to place a Cold Row unit at the end of a row unless an air barrier is in place to prevent the conditioned air from
being drawn around to the hot aisle side, bypassing the front of the servers. An air barrier must also be present to prevent
conditioned air from being drawn over the top of the row into the hot aisle.
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Table 2-1. Recommended
minimum thermal resistance.
Structure R-Value
Ceiling R-38
Wall R-21
Floor R-19
Door R-5
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