Section BXM‐10N‐HE3‐20A
030‐101741 Rev. B
R
17
1311IARB
8.
Pull wires through door.
Pull the disconnected wires to the
exterior side through the hole/fitting in the door.
9.
Verify fan is off.
Visually check to ensure that the fan
blades are NOT rotating.
10.
Remove fan mounting bracket.
Loosen and remove the
two hex nuts on either side of the bracket that secures the
exterior fans. Remove the bracket.
11.
Dismount fans.
Remove/lift off the old fan(s).
12.
Re‐mount bracket.
Temporarily re‐mount the bracket and
thread the nuts back onto their posts to secure the bracket.
13.
Return fans.
Return the fan(s) to Westell for repair or re
placement (see Paragraph 7.2).
14.
Install replacement fan(s).
Remove the fan mounting
bracket. Mount the replacement fan(s) back on the out
side of the door by hanging it/them from the mounting
posts. Align the holes in the heat exchanger wall with the
holes in the fans and the fan mounting bracket, and re‐in
sert and thread the screws through the aligned hole sets.
Verify the fan cable wires exit at the top of the fan assembly,
that they are/will not be pinched under the fan, and that
they face or route toward the cable access hole in the door
at the left side of the heat exchanger unit. Verify the fans are
oriented and mounted such that the air flow direction will
be out of the cabinet. (Re)route the fan wires toward the
controller card, noting and using the cable routing from
Step 7 above. Route, manage and secure the wires (and any
slack) so they are neat and will not be pinched.
15.
Connect fan wires to “FAN A” Euro‐connector.
Remove the
empty FAN A connector from the controller card. Twist and
join together the stripped ends of the same‐colored wires
from each fan (i.e., twist a red wire end from one internal
fan with a red wire end from the second internal fan), to
make a conjoined single wire. Insert this conjoined wire in
to its proper wire port hole in the connector (e.g., insert the
RED wire(s) into the port labeled “RED”) and tighten the
port's set screw to secure the wire. Repeat for the other/
black conjoined wire. Read the note below prior to securing
the fan(s) and making wire connections.
‐ FAN WIRING IN EURO‐CONNECTOR NOTE ‐
One Euro‐connector serves two fans: there is one connector for
the two external air fans (connector labeled “FAN A”) and one
connector for the two internal air fans (“FAN B”). Each fan has
a black wire and a red wire. When wiring a new or replacement
fan, the same colored wire from each fan should first be twisted
together as a single wire unit prior to insertion into its proper
termination hole in the connector.
16.
Apply power; re‐install FAN A Euro‐connector and fuse.
Keeping fingers, hair, clothing, wires, tools, etc. away from
the fans, insert the FAN A Euro‐connector and the 5A fuse
back into their proper positions in the controller card.
Verify the connector is
not
upside‐down (i.e., BLK wires
terminating at position labeled BLK [up], RED wires at
position labeled RED [down]).
17.
Verify power is present, and test.
Verify the fans are opera
tional and working properly. Use the fan test button if/as
needed.
Figure 22. Field Replacement of Fans & Door Switch
Loosen hex nuts
to remove fans
Inside‐air fans
Wired to FAN B connector
Loosen
remove
nuts to
fans
Outside‐air
Wired to FAN A
connector in
Controller Card
in Controller Card
(2 wires for each fan,
join same‐colored wires together
from each fan prior to insertion
into connector in controller card)
fans
Door Switch
Cylindrical actuator
5.3
Replacing the “Inside Air” Fans
Fans cannot be field
repaired
. Should a problem be suspected
with an “inside air” fan, remove the fan and return it to Westell
for service, then
replace
it. See Table 4 for ordering informa
tion. To remove and replace an “inside air” fan, proceed with
the following instructions.
‐ CAUTION ‐
To avoid electrical shock, turn off any DC or AC power feeds
to the controller before beginning this procedure.
1.
Open the cabinet.
Open the cabinet door by loosening the
cup‐washer screws with a 216 tool or can wrench (‐NHE3)
or with the provided pin‐in‐hex wrench (‐NHE3G).
2.
Remove fuse.
Remove the 5A fan fuse from the controller
card (see Figure 9 or Figure 17 for fuse location).
3.
Disconnect fan power.
Disconnect the FAN B connector at
the controller card.
4.
Remove wires from connector.
Remove both wire sets from
the now disconnected Fan B Euro‐connector by unscrew
ing the two set screws in the connector, pull out the
loosened wires. Note that two same‐colored wires, one
from each fan, were twisted together to form a single wire
for each wire‐port connection.
5.
Replace connector.
Insert the empty connector back into
the controller card.
6.
Verify fan is off.
Visually check to ensure that the fan
blades are NOT rotating.
7.
Note fan cable routing and free the cable wires.
Make a
note of the fan cable wire‐routing between the fan mount
ing location and the controller card, for reference when
installing the replacement fans/cable wires. Gently free or
loosen the wires from any cable management devices.
8.
Remove fan mounting screws.
Remove the screws that se
cure the fan(s) to the inside of the cabinet door.
