Temperature Sensor Replacement; Prerequisites To Temperature Sensor Replacement; Temperature Sensor Replacement Task Flow - Nortel Passport 15000 Hardware Installation And Maintenance

106 Chapter 7 Cooling units

Temperature sensor replacement

Prerequisites to temperature sensor replacement

Temperature sensor replacement task flow
241-1501-240 5.2S2
Replace a temperature sensor if it fails.
• "Prerequisites to temperature sensor replacement" (page 106)
• "Temperature sensor replacement task flow" (page 106)
• You need the appropriate version of temperature sensor:
— NTCC8938 (or A0647397) for the temperature sensor inside an
NTHR51AA lower (rear) cooling unit
— A0521940 for the temperature sensor inside an NTHR51AB lower
(rear) cooling unit
— NTCC8938 (or A0647397) for the temperature sensor on the bracket
assembly NTHR68AA used with an NTHR52AA upper (front)
cooling unit
— A0521944 for the temperature sensor on the bracket assembly
NTHR68AB used with an NTHR52AB upper (front) cooling unit
• The NTCC8938 (or A0647397) and A0521944 temperature sensors are
not interchangeable and can only be used with the indicated equipment.
• The PEC of the cooling units NTHR51AB and NTHR52AB is visible on
its mounting ear. The mounting ears are blank for the NTHR51AA and
NTHR52AA versions. To distinguish a lower cooling unit NTHR51AA
from an upper unit NTHR52AA, observe the cable connectors that are
only on the mounting ear of a lower cooling unit.
• The PEC of the temperature sensor bracket assembly with version AB is
visible on the installed bracket. The AA version is not visible.
This task flow shows the sequence of procedures you do to replace a
temperature sensor. To link to any procedure, go to "Task flow navigation"
(page 107).