Section BXM‐161‐7HE‐20A
030‐101765 Rev. B
R
6
1311IARB
Figure 12. Heat Exchanger Compartment Location
DO NOT remove the heat exchanger unless it is being replaced.
To replace/remove the heat exchanger, see Paragraph 5.2.
Heat
Exchanger
Unit
Air flow
cut‐out
holes
ry‐installed so approximately 5” of equipment space is available
from the inside of the closed front door to the channel (for up
to a 5” equipment projection), and approximately 12” of equip
ment space is available behind the channel to the rear cabinet
wall. The channels can be moved forward 2” or backward 3”, if
a few additional inches of equipment depth is needed at either
the front or back of the channel. The slotted mounting brackets
for each channel contain seven holes which allow six channel
positions. Each rack channel also contains predrilled holes, with
standard hole spacings (either 1”, 1.75”, or 2” rack hole pat
terns), to mount customer‐supplied equipment in the cabinet.
Network equipment up to 16 Rack Units (16 RUs = 28”) high
can be mounted on the internal rack inside the cabinet, either as
a single piece or multiple pieces of equipment.
‐ LEFT CHANNEL NOTE ‐
Access to the controller card may be limited if one of the front‐
most channel mounting positions is chosen for the left channel.
2.2.2
Door Sensor Switch
A door sensor switch is located at the bottom right corner of the
cabinet door opening (Figure 11). This switch is factory‐pre
wired to the Controller Card for door alarm reporting purposes.
To temporarily disable the sensor, pull out the cylindrical door
switch actuator until it clicks. To re‐activate the sensor, either
gently push the actuator back in until a click is heard, or simply
close the cabinet door.
2.2.3
Cooling System / Heat Exchanger
The Boxer cabinet features an active heat‐exchange system that
compensates for the effects of internal equipment heat and ex
ternal solar and temperature loading inside the cabinet. The two
heat exchanger fans (see location in Figure 12) are temperat
Figure 11. Door Sensor Switch Location
Door Switch
(prewired to
controller card)
ure activated. The fans turn on when the interior of the cabinet
reaches 35° C (95° F) and turn off when the internal cabinet
temperature cools to 25° C (77° F). At the core of the heat ex
change system are numerous aluminum fins (visible through the
compartment's vent holes) on each “side” of a sealed divider
wall within the heat exchanger. The dual air‐path exchanger uses
the lower‐mounted fan to blow cool outside air past the “exterior
air side” fins of the heat exchanger and to direct the heated air
out the vent holes on the sides of the fan cover. Conversely, the
upper‐mounted fan circulates warm inside air down past the “in
terior air side” fins of the heat exchanger and blows cooled air
into/through the main cabinet compartment. The heat ex
changer unit is field‐replaceable (see Table 4 for part number).
2.2.4
Heat Exchanger Fans
(“
FAN A” Connector)
Two, factory‐installed, temperature‐controlled fans (shown in
Figure 12) circulate air through the heat exchanger. One fan is
used for the external circuit, and one fan is used for the internal
circuit.
The internal fans perform as follows:
G
Off at ‐40°C
G
50% on at 30°C
G
100% on at 45°C
The external fans perform as follows:
G
Off at ‐30°C
G
50% on at 40°C
G
100% on at 55°C
Both of these fans are factory‐wired to the “FAN‐A” connector
on the controller card mounted on the left side wall of the cabi
net, and are powered from either a field‐pr24VDC
power source or a ‐48VDC power source. The fans are not
field‐replaceable, and the heat exchanger housing the fans must
be replaced in the event of a unit failure (see Table 4).
2.2.5
Controller Card
Boxer‐16 includes a factory‐wired controller card located on the
inside left wall of the cabinet (Figure 13). The card includes con
nections for the fans, temperature alarm, door alarm, and a 3A
fan fuse. Internal wiring has been factory‐wired. External wiring
to the power source and alarm monitoring equipment is done us
ing “Euro‐connector” snap‐in terminal blocks which can be
disconnected from the controller card, and later re‐attached for
quick and easy connections. Table 2 lists all of the connectors
and positions on the controller card. The only installer connec
tions are the TEMP ALARM, DOOR ALARM, and ‐48V and
GND for power connections. To make these connections to the
Figure 13. Controller Card (Showing Euro‐connectors)
Isometric
View
Side View
