Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 592 / 874

592 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Installing an upper cooling unit
Install an upper (front) cooling unit to enable temperature control of the
Passport switch hardware in the upper position of a NEBS 2000 frame.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need an NTHR52AA or NTHR52AB version of an upper (front)
cooling unit. Since the fans of the unit are on the front face of the switch
hardware, that is, on the same side that the processor cards plug into, the
upper cooling unit is also the front cooling unit.
• You need a driver for the thread-forming 10-mm (3/8-in.) hex-head
screws that fasten each cooling unit to the frame or rack.
• You need a helper to hold the unit until it is fastened because it weighs
(9.1 kg or 20 lbs) and tends to slide out of position when it is unfastened.
Procedure steps
1 Open the container identifying the cooling unit as NTHR52 and remove
the unit.
2 While referring to the figures “An upper cooling unit NTHR52AA”
(page 594) and “An upper cooling unit NTHR52AB” (page 595), hold the
ends of the cooling unit so that
• the open side is at the top
• a hand holds the narrow rear end
• a hand holds the fan end
3 Facing the rear of the Passport 15000 or 20000 switch, insert the narrow
end of the cooling unit between the uprights of the NEBS 2000 frame and
above the lower (rear) cooling unit.
4 Rest the narrow end of the cooling unit on the top of the lower cooling unit.
5 Slowly slide the cooling unit inwards until the mounting ears at the fan end
touch the frame uprights.
6 Align the mounting-ear holes with the screw holes on the frame uprights.
The cooling unit should be in position as shown in the figure “Location of
an upper (front) cooling unit” (page 596).