Section BXM‐10N‐HE5‐20A
030‐101815 Rev. A
R
5
1402IARA
Figure 7.
Location/Function of Door Sensor Switches
Door open
alarm switch
Door open
fan cut-off
switch
Door Switches
(prewired to controller card)
FRONT VIEW
10 RUs of
Vertical
Rack
Space
Figure 8.
Front View, Door Off, Showing Rack Channels
closed front door to the channel (for up to a 5” equipment pro
jection), and approximately 12” of equipment space is
available behind the channel to the rear cabinet wall. The slot
ted channel bracket allows both channels to be easily moved
forward 2” or backward 3”, if a few additional inches of equip
ment depth is needed at either the front or back of the channel.
Six channel positions are provided in the channel bracket.
Simply loosen the hex nut, lift and slide the channel backward
or forward the next slot position, then tighten the nut. Both ver
tical rack channels contain predrilled holes, with standard hole
spacings (either 1”, 1.75”, or 2” rack hole patterns), for mount
ing customer‐supplied equipment in the cabinet. Network
equipment up to 10 Rack Units (10 RUs = 17.5”) high can be
mounted on the rack inside the cabinet, either as a single piece
or as multiple pieces of equipment.
2.2.3
Cooling System
The Boxer cabinet features an active heat‐exchange system
that compensates for the effects of internal equipment heat
and external solar and temperature loading inside the cabinet.
The heat exchanger fans are temperature 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 exchange system are nu
merous aluminum fins (best seen in Figure 2) on each “side” of
a sealed divider wall within the heat exchanger. The dual air‐
Figure 9.
Controller Card (Showing Euro‐connectors)
Isometric
View
Side View
Manual fan
test switch
path exchanger uses one set of fans (shown in Figure 5) to blow
cool outside air past the “exterior air side” fins of the heat ex
changer and to direct the heated air out the vent on the sides
of the fan cover. Conversely, a second set of fans (shown in
Figure 2 and Figure 7) circulates warm inside air down past the
“interior air side” fins of the heat exchanger and blows cooled
air back through the main cabinet compartment. Both sets of
fans are field‐replaceable (see Paragraphs 5.2 and 5.3,
Figure 19, and Table 4 for part numbers).
2.2.4
External‐Air Fans
(“
FAN A” Connector)
Two, factory‐installed, temperature‐controlled fans (shown in
Figure 5) to circulate cooler exterior air up through the heat ex
changer are located under the cover for the heat exchanger
compartment. These fans are factory‐wired to the “FAN‐A”
connector on the Controller Card mounted on the inside of the
cabinet door, and are powered from either a field‐provided
‐48VDC power source or a +24VDC power source. To access
or view the fans, loosen the Phillips‐head screw at the
interior
bottom of the main door (see Figure 3), then lift the cover off
the two alignment posts (Figure 5) near the top of the cover.
‐ DOOR SENSOR NOTE ‐
The door sensor will turn off the fans when the door is opened.
2.2.5
Internal‐Air Fans (“FAN B” Connector)
Two, factory‐installed, temperature‐controlled fans (shown in
Figure 2) to circulate warm interior air down through the heat ex
changer and back into the cabinet are are located on the inside of
the cabinet door. These fans are factory‐wired to the “FAN‐B”
connector on the Controller Card mounted on the inside of the
cabinet door, and are powered from either a field‐provided
‐48VDC power source or a +24VDC power source.
2.2.6
Controller Card
Boxer includes a factory‐wired controller card (Figure 9) lo
cated on the inside of the cabinet door. The card includes
connections for the fans, door alarm, temperature alarm, a 5A
fan fuse, and a fan test button. Internal wiring for the fans and
door alarm has been factory‐wired. External wiring to the pow
er source and alarm monitoring equipment is done using
“Euro‐connector” snap‐in terminal blocks which can be dis
connected 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
