Section BXM‐161‐4HE‐20A
030‐101374 Rev. A
R
6
1211IARA
Figure 12. Heat Exchanger Compartment, Cover Off
Fans for circulating
external air
Nut
(remove to
replace fans)
Bottom vent for air intake
(Fan A connector)
To unlock the
compartment cover,
loosen the phillips
head screw on the in
side of the door (see
Figure 3 for location)
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‐16 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. At the
core of the heat exchange system are numerous aluminum fins
(best seen in Figure 2) on each “side” of a sealed divider wall
within the heat exchanger. The dual air‐path exchanger uses one
set of fans (shown in Figure 12) to blow cool outside air past the
“exterior air side” fins of the heat exchanger and to direct the
heated air out the screened holes on the sides of the fan cover.
Conversely, a second set of fans (shown in Figure 2 and
Figure 11) 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 Table 4 for part numbers).
2.2.4
Internal‐Air Fans (“FAN B” Connector)
Two, factory‐installed, always‐on fans (see Figure 11) to circu
late warm interior air down through the heat exchanger and back
into the cabinet are are located on the inside of the cabinet door.
These fans, secured with Phillips screws, are factory‐wired to the
“FAN‐B” connector on the Controller Card mounted on the left
side wall of the cabinet, and are powered from a field‐provided
‐48VDC power source.
2.2.5
External‐Air Fans
(“
FAN A” Connector)
Two, factory‐installed, always‐on fans (shown in Figure 12) to
circulate cooler exterior air up through the heat exchanger 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 left side wall of the cabinet, and
are powered from a field‐provided ‐48VDC power source. To ac
cess or view the fans, loosen the Phillips‐head screw located just
under the two internal fans on the inside of the door, then from
the outside of the cabinet, lift off the external cover.
Figure 13. Controller Card (Showing Euro‐connectors)
Isometric
View
Side View
Connector
Name
# of
Positions
Position
Name
Description
Left Side of Controller Card
TEMP ALARM
2
NO
Normally open
(Installer connects to field‐
provided equipment.)
COM
Common
(Installer connects to field‐
provided equipment.)
DOOR ALARM
2
NO
Normally open
(Installer connects to field‐
provided equipment.)
COM
Common
(Installer connects to field‐
provided equipment.)
FAN
−
A*
(left side, door open)
2
BLK
−
voltage. Factory
connected to Fan A.
RED
+ voltage. Factory
connected to Fan A.
FAN
−
B
(right side, door open)
2
BLK
−
voltage. Factory
connected to Fan B.
RED
+ voltage. Factory
connected to Fan B.
Power
Connections
2
-48V
Apply -48V
(Installer connects to field‐
provided local DC power.)
GND
System Ground
(Installer connects to field‐
provided local DC power.)
Bottom of Controller Card
DOOR INPUT
ALARM
2
BLK
Factory installed. Con-
nects to door switch.
RED
TEMP INPUT
ALARM
N/A
Factory installed. Con-
nects to temperature
sensor on controller card.
*Two fans are wired to each set of terminals.
Shaded rows indicate installer connections (TEMP ALARM, DOOR ALARM, and Power)
Table 2. Controller Card Connectors
2.2.6
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