Carrier 48HDT - Manual (Page 18)

SERVICE
Cleaning — Inspect unit interior at the beginning
of each heating and cooling season or as operating
conditions require.
EVAPORATOR COIL
1. Turn unit power off. Remove indoor fan motor
access panel.
2. Diseonnect indoor motor wiring from main
control box.
3. Remove screws from base of fan motor housing.
4. Slide fan motor housing out of base unit.
5. Clean coil using a commercial coil cleaner
(i.e., Oakite 164) or dishwasher detergent in a
pressurized spray canister. Wash both sides of
coil and flush with clean water. For best results,
backflush toward return air section to remove
foreign material. Flush condensate pan after
completion.
6. Reinstall fan motor housing, reconnect wiring
and replace indoor fan motor access panel.
Fig. 32 — Cleaning Condenser Coil
Fig. 33 — Propping Up Top Panel
Fig. 34 — Separating Coil Sections
CONDENSER COIL — Inspect coil monthly.
Clean condenser coil annually, or as required by
location or outdoor air conditions.
Fins are not continuous through coil sections.
Dirt and debris may pass through first section,
become trapped between the 2 rows of fins, and
restrict condenser airflow. Shine flashlight through
coil to determine if dirt or debris has collected
between coil sections.
Clean coil as follows:
1. Turn off unit power.
2. Remove top panel screws on condenser end of
unit. Remove screws from coil side of coil center
post. Do not remove center post.
3. Remove condenser coil corner post. See Fig. 32.
To hold top panel open, place coil corner post
between top panel and center baffle. See Fig. 33.
4. Remove device holding coil sections together at
return end of condenser coil. Carefully separate
the outer coil section 3 to 4 in. from the inner coil
section. See Fig. 34.
5. Use a water hose or other suitable equipment to
flush down between the 2 coil sections to remove
dirt and debris. Clean the outer surfaces with
a stiff brush in the normal manner.
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6. Reposition the outer coil section, remove the coil
corner post from between the top panel and
center baffle. Secure the sections together. Install
the coil corner post, coil center post and replace
all screws.
CONDENSATE DRAIN — Check and clean each
year at start of cooling season. In winter, keep drain
and trap dry or protect against freeze-up.
FILTERS — Clean or replace at start of each heat­
ing and cooling season, or more often if operating
conditions require it.
OUTDOOR AIR INLET SCREENS (Downshot
Units) — Clean screens with steam or hot water
and a mild detergent. Do not use throwaway filters
in place of screens.
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