Table 8 — Cleaning and Maintenance Schedule
TASK MONTHLY QUARTERLY YEARLY
INDOOR UNIT
Clean Air Filters X
Clean Drain Pipe X
Clean Condensate Drain Pan X
Replace Batteries in the Remote Controller X
Clean Indoor Unit Front Panel X
OUTDOOR UNIT
Clean the Fins From Outside X
Open the Unit and Clean Fins Inside X
Remove Dust From Electrical Parts X
Check Electrical Connections are Tight X
Clean Outdoor Fan X
Check that Outdoor Fan Assembly is Tight X
Clean Drain Pan X
NOTE: Maintenance procedures for the outdoor unit are in the 538A, 538D, and 538S installation instructions.
III. TO SET THE CURRENT TIME
TA
1. Press the button (located on the back of the re-
mote controller; see Fig. 23) with an instrument screw-
driver or similar small, pointed tool, and the current time
indication symbol flashes.
Note that the controller comes preset from the factory set for
6:00 a.m.
2. Set the current time with the hour and minute buttons
on the front of the remote controller (see Fig. 22) while
the current time indication is flashing. Note that a.m.
and p.m. are also indicated as the times are scrolled
through.
TA
3. Press again. The flashing will stop and the cur-
rent time will be reset to the new setting.
IV. TO REMOVE AND CLEAN OR REPLACE AIR FILTERS
CAUTION:
Operating your system with dirty air fil-
ters may damage the indoor unit and can also cause re-
duced cooling performance, intermittent system opera-
tion, frost build-up on the indoor coil, and blown fuses.
Inspect and clean or replace the air filters monthly.
A. To Remove Air Filters
1. Open fan coil unit front panel (lift). See Fig. 24.
2. Pull the filters down to remove.
B. To Clean or Replace Filters
Filters should be vacuumed and washed with warm water
(see Fig. 24). Shake filter to remove any excess water, dry
thoroughly, and replace by sliding filter behind front grille
until filter snaps in place.
If the filter has begun to break down or is torn, it needs to be
replaced. Replacement filters are available through your Car-
rier distributor.
V. TO CLEAN INDOOR UNIT FRONT PANEL
If the front panel of the unit becomes dirty or smudged, wipe
the outside of the front panel with a soft dry cloth. If neces-
sary, use a mild liquid detergent and wipe off carefully with
a dry cloth.
CAUTION:
When cleaning the front panel, NEVER
use water hotter than 105 F, and DO NOT pour water
onto the fan coil unit. Do not use abrasive or petroleum-
based cleaners — damage to unit appearance will
result.
REMOVE COVER INSERT NEW BATTERIES PRESS
RST
NOTE: Be sure to insert new batteries correctly (as shown).
Fig. 22 — Installing or Replacing Batteries
—17—
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