Procedure 8.18: REPLACE FAN UNIT AIR FILTERS IN ISLU DRAWER-TYPE UNITS
OVERVIEW
This procedure replaces the UAF235 filter in the ISLU (integrated service line unit) drawer-type fan unit. The unit
contains three fans and one UAF235 filter. The filter is accessed from the rear of the drawer unit.
NOTE 1:
Service air filters at least every 6 months per equipment test list or more often if conditions
dictate.
NOTE 2:
The Model UAF235 air filter replacements can be ordered from:
Universal Air Filter Company, Sauget, IL 62206
PROCEDURE
1.
CAUTION:
Do not vacuum the used air filters UAF235. The used air filters should be replaced
with new air filters.
2.
Open the cabinet rear door.
3.
NOTE 1:
The upper cable assembly serves the fan alarm CP which monitors the fans in the
drawer unit. The state of the alarm circuit is normally open. Unplugging the cable assembly will not
be detected by the
5ESS
®
-2000 switch.
NOTE 2:
It is not necessary to use a fan blocker when replacing the fan unit air filter in a drawer because all
three fans stop when the upper cable assembly is unplugged from the 256A fan alarm CP.
Unplug the upper cable assembly from the 256A fan alarm CP. Apply gentle outward pressure on both sides
of the latching block. Carefully unplug the cable assembly using caution to pull the assembly straight off. See
Figure 8.18-1 .
Response:
All 3 fans stop.
4.
Remove the old air filter by sliding the filter back until it clears the mounting channel.
5.
Insert the new air filter in the mounting channel.
6.
Slide the filter forward until it is fully seated.
7.
CAUTION:
Be careful not to bend the pins on the 256A CP.
Plug in the upper cable assembly that was unplugged in Step 3. Gently push the cable assembly on until it is
locked.
Response:
All 3 fans run.
8.
Repeat Steps through 7 for each drawer in the cabinet, and continue with the next step.
9.
Close the rear cabinet door.
10.
Dispose of the old air filters per local procedures.
235-105-210
October 1999
Copyright © 1999
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