Carrier P - Manual (Page 11)

11
SEASONAL CLEANING
The indoor and outdoor coils should be cleaned at least
once during every season. Refer to ACCESSING
UNIT COMPONENTS section to prepare unit.
■ CLEANING THE INDOOR AND OUTDOOR
COILS
1. Use a vacuum cleaner or soft bristle brush to
remove surface fibers and dirt from the interior
surface of evaporator coil and both surfaces of con-
denser coil. See Figure 24. It is important to apply
the tool in the same direction of the fins, not
against them. Applying the tool against the fins
may cause damage (fin edges may bend over).
2. With a tank sprayer or a trigger spray extension
tube, spray coil cleaning solution evenly across
the coils, making sure coils are thoroughly satu-
rated. See Figure 25. Refer to instructions on the
cleaning solution containers for best results. Do
not use a high-pressure sprayer.
3. Rinse the coils thoroughly with low-velocity, clean
warm water (less than 200 F).
4. Repeat steps 2 and 3 for each coil surface.
5. Drain water and cleaning solution that may have
collected in the basepan during the cleaning pro-
cess by carefully tilting the chassis. This allows
excess water to flow out of the overflow notches.
6. Thoroughly clean the basepan and drain passages
by rinsing with clean water. Be sure all debris is
removed from the drain valve. See Figure 26.
7. Thoroughly clean outdoor fan assembly and all
other mechanical components located in outdoor
coil area. Be sure to remove all dirt and debris.
8. Clean wall sleeve.
■ CLEANING THE INDOOR FAN AND FAN
SCROLL — Dried debris and build-up on the blower
wheel and fan scroll can reduce the efficiency of the
unit.
1. ACCESS AND CLEAN INDOOR FAN AND
FAN SCROLL
a. Reach behind the indoor coil and vacuum any
loose debris from the condensate drain pan, fan
and other areas accessible to the fan scroll,
being careful to avoid damage to the coil fins.
b. Use mild detergent and a damp cloth to remove
stubborn debris from surfaces around scroll and
fan blades.
2. CLEAN HEATER ASSEMBLY — Use com-
pressed air to blow off any dirt or dust that has
accumulated on the heater coils.
NOTE: Do not direct air at the bi-metal discs on
the temperature limiter switches.
Coil fins are sharp and may cut hands. Wear heavy
protective gloves when cleaning coils.
Use only cleaning solutions that meet local codes.
Do not set unit on end to drain water from basepan,
or at any other time. Oil will drain from the com-
pressor sump, which could cause compressor failure.
FIGURE 21 — LOCATION OF
TWO-PIECE INDOOR FILTER
VENT DOOR
OUTDOOR
AIR FILTER
FIGURE 22 — LOCATION OF OUTDOOR AIR
VENT FILTER