
446 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Installing a fan
Install a fan to increase the cooling efficiency of the cooling unit.
Prerequisites
•
You must be familiar with “Safety considerations and best practices”
(page 53).
•
You need the appropriate version of a fan:
— A0758423 for any fan in a lower (rear) cooling unit NTHR51AA or
a upper (front) cooling unit NTHR52AA
— A0522179 for the middle fan of a lower (rear) cooling unit
NTHR51AB or a upper (front) cooling unit NTHR52AB
— A0522182 for either side fan of a lower (rear) cooling unit
NTHR51AB or a upper (front) cooling unit NTHR52AB
•
For any version of a fan, you need a driver for the 4-mm (11/64-in.)
screws that fasten the fan and its grill to the cooling unit. The screws are
65-mm long for an A0758423 in an NTHR51AA or an NTHR52AA. The
screws are 60-mm long for an A0522179 or an A0522182 in an
NTHR51AB or an NTHR52AB.
•
A fan in an NTHR51AA or an NTHR52AA is the same for all installed
positions. The middle fan in an NTHR51AB or an NTHR52AB is a
different shape than the side fans that are adjacent to it. To distinguish
one fan unit from another, see these figures:
— “Location and orientation of the fans on any version of cooling unit”
— “A side fan A0522182 for a cooling unit NTHR51AB or
— “A middle fan A0522179 for a cooling unit NTHR51AB or
•
The system must provide a minimum of -48 V dc as the start-up power
for either an A0522179 or A0522182.
•
Minimize the impact of removing a fan by inserting the replacement
immediately.
Содержание Passport 15000
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Страница 6: ...6 Publication history 241 1501 240 5 2S2 ...
Страница 32: ...32 Contents 241 1501 240 5 2S2 ...
Страница 48: ...48 About this document 241 1501 240 5 2S2 ...
Страница 52: ...52 Chapter 1 Overview of hardware tasks 241 1501 240 5 2S2 ...
Страница 70: ...70 Chapter 2 Safety considerations and best practices 241 1501 240 5 2S2 ...
Страница 84: ...84 Chapter 4 Alarm BITS module 241 1501 240 5 2S2 ...
Страница 94: ...94 Chapter 5 CP and FP cables 241 1501 240 5 2S2 ...
Страница 178: ...178 Chapter 11 Initial switch hardware installations 241 1501 240 5 2S2 ...
Страница 182: ...182 Chapter 12 MAC address module 241 1501 240 5 2S2 ...
Страница 216: ...216 Chapter 14 Power and ground hardware of a Passport 15000 or 20000 241 1501 240 5 2S2 ...
Страница 872: ...872 Chapter 17 Hardware procedures 241 1501 240 5 2S2 ...
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