1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, outdoor coil, drain pan, and condensate
drain each cooling season lbr cleanliness. Clean when neces-
sary.
3. Inspect blower motor and wheel lor cleanliness each cooling
season. Clean when necessary. For first heating season,
inspect blower wheel bimonthly to determine proper cleaning
b'equency.
4. Check electrical connections lbr tightness and controls l_r
proper operation each cooling season. Service when neces-
sal-y.
5. Check the drain channel in the top cover periodically lbr
blockage (leaves, insects). Clean as needed.
Failure to lbllow these warnings could result in serious injury
or death:
1. Turn olTelectrical power to the unit belore perlorming any
maintenance or service on the unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injuU can result
li"om sharp edges, etc.
3. Never place anything combustible either on, or in contact
with_ the unit.
Step 1--Air Filter
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the
same dfinensional size and type as originally installed. See
Table 1 lk_rrecommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each cooling season or whenever the filters become clogged with
dust and lint.
Replace filters with the same dimensional size and type as
originally provide& when necessary.
Step 2--Unit Top Removal (Condeneer-Coil Side)
NOTE: When perlorming maintenance or service procedures that
require removal of the unit top, be sure to perli)rln all of the routine
maintenance procedures that require top removal, including coil
inspection and cleaning, and condensate drain pan inspection and
cleaning.
Disconnect and tag electrical power to the unit belbre
removing top. Failure to adhere to this warning could cause
serious injury or death.
Only qualified service personnel should perlorm maintenance and
service procedures that require unit top removah
Relier to the lollowing top removal procedures:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 2 screws on unit top cover flange. (Save all screws.)
3. Lil_ top b'om unit carefully. Set top on edge and make stare
that top is supported by unit side that is opposite duct (or
plenum) side.
4. Carefully replace and secure unit top to unit, using screws
removed in steps 1 and 2, when maintenance andk_r service
procedures ale completed.
Step 3--Evaporator Blower and Motor
For longer lili:, operating economy, and continuing efficiency,
clean accunmlated dirt and grease li"om the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit belk_re
cleaning the blower wheel. Faihn'e to adhere to this warning
could cause serious injury or death.
To clean the blower wheel:
1. Access the blower assembly as lbllows:
a. Remove top access panel.
b. Remove 3 screws that hold blower orilice ring to blower
housing. Save screws.
c. Loosen setscrew(s) which secure wheel to motor sbalk.
2. Remove and clean blower wheel as lbllows:
a. Lilt wheel li"om housing. When handling and/or cleaning
blower wheel be sure not to disturb balance weights (clips)
on blower wheel vanes.
b. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations li"om wheel
and housing with vacuum cleaner, using a solk brush
attachment. Remove grease and oil with a mild solvent.
c. Reassemble blower into housing. Place tapper orifice ring
on blower to judge location of the blower wheel. Blower
wheel should be approximately 0.2-in. below bottom ol'
orifice ring when centered correctly. Be stare setscrews are
tightened on motor and are not on round part of shali.
d. Set tapper orifice ring in place with 3 screws removed in
step 1.
e. Replace top access paneh
Step 4--Condenser Coil, Evaporator Coil, and Conden-
sate Drain Pan
Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year. Proper inspection and cleaning
requires the removal of the unit top. See Unit Top Removal section
ahoy('.
The coils are easily cleaned when dry; therelbre, inspect and clean
the coils either belore or alter each cooling season. Remove all
obstructions (including weeds and shrubs) that interli.:rc with the
airflow through the condenser coil. Straighten bent fins with a fin
comb. If coated with dirt or lint, clean the coils with a vacuum
cleaner, using a sol1 blq.lsh attachment. Be careful not to bend the
fins. If coated with oil or grease, clean the coils with a mild
detergent-and-water-solution. Rinse coils with clear water, using a
garden hose. Be careful not to splash water on motors, insulatiom
wiring or air lilter(s). For best results, spray condenser-coil fins
from inside to outside the unit. On units with an outer and inner
condenser coil be stare to clean between the coils. Be sure to flush
all dirt and debris from the unit base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing all
lk_reign matter li"om the pan. Flush the pan and drain tube with
clear water. Do not splash water on the insulation, motor_ wiring,
or air filter(s), If the drain tube is restricted, clear it with a
"phnnbers snake" or similar probe device. Ensure that the
auxiliary drain port above the drain robe is also clear.
16
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