Installing A Shelf-Based Cooling Unit - Nortel Passport 15000 Hardware Installation And Maintenance

514 Chapter 17 Hardware procedures

Installing a shelf-based cooling unit

Prerequisites
Procedure steps
241-1501-240 5.2S2
Install the shelf-based cooling unit into a mounting apparatus other than a
NEBS 2000 frame to ensure that ambient temperature inside the Passport can
be maintained.
• You must be familiar with "Safety considerations and best practices"
(page 53).
• The shelf-based cooling unit is included in the shelf-based kits NTQS04
for a Passport 15000 or NTQH04 for a Passport 20000. To install the
shelf-based cooling unit, you need this part:
— NTHR52AA or NTHR52AB, Passport 15000 or 20000 upper
cooling unit assembly
• You need a helper to hold the cooling unit until it is fastened because it
weighs about 9 kg (20 lbs) and tends to slide out of position before it is
fastened to the rack.
• As shown in the figure "Position and orientation of the upper cooling unit
NTHR52 in a 23-inch wide rack" (page 517), the cooling unit must be
mounted in the lowest equipment position on the mounting apparatus.
Enough room must remain above it to install:
— the shelf assembly flush against it
— the upper temperature sensor bracket assembly
— about 10 cm (4 in.) of ventilation space
— the strain relief bar
— the BIP
• The front of the rack is the side that faces or will face the same way as
the front of the Passport 15000 or 20000.
1 Hold the ends of the cooling unit so that
• you face the fans
• the open side is at the top