Nortel Passport 15000, Hardware Installation And Maintenance, Page: 536 / 874

536 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Installing a temperature sensor bracket assembly
Install a temperature sensor bracket assembly for an upper cooling unit to
monitor the temperature of the air flow exiting the top of the shelf assembly.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need either version of a temperature sensor assembly bracket:
— NTHR68AA used with an upper (front) cooling unit NTHR52AA or
NTHR52AB
— NTHR68AB used with an upper (front) cooling unit NTHR52AA or
NTHR52AB
• You need a driver for the thread-forming 10-mm (3/8-in.) hex-head
screws that fasten the bracket to the frame or rack.
• You need a step ladder to see the top of an upper shelf assembly that is
mounted in a NEBS 2000 frame or other mounting apparatus.
• You must the install the temperature sensor bracket when you have these
hardware kits:
— upper shelf upgrade NTQS03 for Passport 15000 or NTQH03 for
Passport 20000
— shelf-based NTQS04 for Passport 15000 or NTQH04 for
Passport 20000
Procedure steps
1 If not already assembled, fasten each of 3 sensors to the NTHR68 bracket
with a circuit board in between them. Use the small Phillips screws.
Ensure that the wire connectors point to the right along the axis of the
bracket as shown in the figure “A temperature sensor bracket assembly
NTHR68AA for a cooling unit NTHR52AA” (page 538). The sensors may
be different on the NTHR68AA version as shown in the figures “A
temperature sensor bracket assembly NTHR68AA for a cooling unit
NTHR52AA” (page 538) and “A temperature sensor bracket assembly
NTHR68AB for a cooling unit NTHR52AB” (page 539).
2 While facing the rear of the BIP, hold the bracket assembly so that:
• the sensors point upwards