Section BXM‐10N‐HE3‐20A
030‐101741 Rev. B
R
6
1311IARB
Figure 8.
Heat Exchanger Compartment, Cover Off
Fans for circulating
external air
Hex nut
(remove to
replace fans)
Bottom vent for air intake
(Fan A connector)
Lift cover up
and off
(after removing
screw at inside
bottom center
of door)
Alignment posts for cover
(to align & secure the top of
the cover, see Figure 2 for
matching holes in cover)
power source or a ‐48VDC power source. To access or view the
fans, loosen the Phillips screw near the inside center of the door,
then lift off the cover off it's two posts.
2.2.5
Internal‐Air Fans (“FAN B” Connector)
Two, factory‐installed, temperature‐controlled fans (see
Figure 6) to circulate 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 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 either a field‐pro
vided +24VDC power source or a ‐48VDC power source.
2.2.6
Controller Card
This section and Table 2 describe the features of the controller
card. Internal wiring has been factory‐wired. See Paragraph
3.9 to perform external connections (installer power, temper
ature, and alarm wiring and connections) to the controller card.
Boxer includes a factory‐wired controller card located on the
inside left wall of the cabinet (Figure 9). The card includes con
nections for power and for the fans, temperature alarm, door
alarm, a fan test button and a 5A fan fuse. Internal wiring has
been factory‐wired. External wiring to the power source and
alarm monitoring equipment is done using “Euro‐connector”
snap‐in terminal blocks which can be disconnected from the con
troller card, and later re‐inserted for quick and easy connections.
Table 2 lists all of the connectors and positions on the controller
card.
The only installer connections needed are the TEMP ALARM,
DOOR ALARM, and power connections (‐V and +V).
To make
these connections to the Euro‐connectors, pull‐off the Euro‐
connector, loosen the screws inside the set‐screw holes, strip
approximately 3/8” off the end of each wire, insert wire(s) into
hole(s), tighten screws, and push‐on the Euro‐connector (see
Paragraph
3.9 for more installation details).
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*
(2 External Air Fans)
2
BLK
−
voltage. Factory
connected to Fan A.
RED
+ voltage. Factory
connected to Fan A.
FAN
−
B
*
(2 Internal Air Fans)
2
BLK
−
voltage. Factory
connected to Fan B.
RED
+ voltage. Factory
connected to Fan B.
FAN TEST
button
FAN
TEST
Momentary push-button
to test fan operation
+24V Power
Operation
Only
Power
Connections
2
BLK -V
System Ground
(Installer connects to field‐
provided DC power.)
RED +V
Apply +24V
(Installer connects to field‐
provided DC power.)
−
48V Power
Operation
Only
Power
Connections
2
BLK -V
Apply -48V
(Installer connects to field‐
provided DC power.)
RED +V
System Ground
(Installer connects to field‐
provided DC power.)
Right Side of Controller Card
DOOR
SWITCH 1
2
DOOR
Not used.
SWITCH-1
DOOR ALARM
SWITCH 2
2
DOOR
Door open alarm.
Factory wired.
SWITCH-2
*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
Connectors and Features on the Controller Card
S
TEMP ALARM Euro‐Connector
. A Normally Open (NO)
Temperature Alarm thermostat contact closes when the in
ternal cabinet temperature exceeds 65°C and will remain on
until the temperature drops below 55°C. For temperature
alarm connections, connect alarm wiring from the field‐pro
vided alarm equipment to the 2‐position Euro‐connector at
the top left of the controller card.
S
DOOR ALARM Euro‐Connector
. A Normally Open (NO)
Door Alarm contact closes when the door is opened. For
door alarm connections, connect wiring from the field‐
provided alarm equipment to the 2‐position Euro‐connec
tor labelled DOOR ALARM at the top left of the
controller card.
S
Fan A and Fan B Euro‐Connectors
. The internal temperat
ure‐controlled fans are factory‐wired to the controller
