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LTPS-UM-8007-01, Issue 1
T
U
URNING
P THE
The heat exchanger keeps the temperature within the cabinet below 149°F (65°C). The heat exchanger has dual
air passages; outside air is never mixed with the air in the electronics chamber as shown in
top of the unit draws in outside air at the bottom of the cabinet and exhausts it at the vent at the cabinet top. A fan
at the bottom of the unit draws air from the top of the electronics chamber and exhausts it into the bottom of the
chamber.
Warmer air
exits through
vent under
top of cabinet
below the cabinet
To verify heat exchanger fan operation,
1
Locate the heat exchanger fan control switch as shown in
2
To start the fans, push up on the switch.
Operation of the top fans can be confirmed by sound and air movement at the vent at the top of the cabinet.
Operation of the bottom fans on the side of the heat exchanger can be confirmed by observation from the
bottom of the bays.
3
Set the master fan shelf ON/OFF/MOM switch to ON.
SPX-CABFIN01, SPX-CABFIN04
H
E
EAT
XCHANGER
Cooled air
from outside
Figure 44. Heat Exchanger Air Flow
November 9, 2001
Hot air from
equipment
Cooled air
returns to
equipment
Figure 45 on page
52.
Installation
Figure
44. A fan at the
51
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