DVN 5000
Environmental Guidelines
40
24-10520-22 Rev. –
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2009 Johnson Controls, Inc.
Future Planning
When designing racks and thermal loading, consider future expansion and possible
changes. Adding equipment to a rack can compromise the proper thermal design.
Identify and correct these problems if the interior rack temperature exceeds 85°F
(29ºC).
On some enclosure manufacturers’ tops, knockouts are provided for adding
additional fans once all equipment has been installed.
As stated earlier, the room needs to exhaust all the heat produced by the equipment,
so it is important that the facility be able to handle future expansion.
Troubleshooting Tip
When airflow is inadequate, equipment can fail. For a quick, short-term fix, open the
rear door and place a floor fan facing the rear to lower the rack’s temperature. Do
not
use this method as a long-term fix; however, it may keep heat-sensitive
equipment working while you obtain a replacement.
Standards
Some current standards relating to thermal management, heat release, and
temperature requirements are found in the Network Equipment-Building System
(NEBS) standards.
The Telcordia® GR-63-CORE standard has been found to be unclear in many
respects, so the GR-3028-CORE (Thermal Management in Telecommunications
Central Offices) standard was recently released. This includes the results of
advanced computer modeling techniques for thermal management.
For more information, access the Telcordia website at:
P
REVENTATIVE
M
AINTENANCE
This section describes the specific tasks for properly maintaining the DVN 5000 equipment
and its accessories. When servicing equipment, follow all manufacturer’s guidelines and
instructions.