3. Inspect blower motor and wheel for cleanliness each cooling
season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each cooling season. Service when neces-
sary.
Step 1—Air Filter
IMPORTANT: Never operate the unit without a suitable air filter
in the return-air duct system. Always replace the filter with the
same dimensional size and type as originally installed. See Table
1 for recommended 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 and twice during the heating season, or
whenever the filter becomes clogged with dust and lint.
Step 2—Indoor Blower and Motor
NOTE: All motors are prelubricated. Do not attempt to lubricate
these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit before
cleaning and lubricating the blower motor and wheel. Failure
to adhere to this warning could cause personal injury or death.
Step 3—Outdoor Coil, Indoor Coil, and Condensate
Drain Pan
Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all
obstructions, including weeds and shrubs, that interfere 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 the soft brush
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, insulation, wiring, or air filter(s). For best
results, spray condenser coil fins from inside to outside the unit.
On units with an outer and inner condenser coil, be sure 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
foreign matter from the pan. Flush the pan and drain trough with
clear water. Do not splash water on the insulation, motor, wiring,
or air filter(s). If the drain trough is restricted, clear it with a
“plumbers snake” or similar probe device.
Fig. 26—50XZ Balance Point Worksheet
C03008
Balance Point Worksheet
0
10
20
30
40
50
60
70
80
Outdoor Air Temp (Deg F)
Build ing Heat Loss (1000 BTUH)
Unit Integrated Heating Capacit y (x1000 BTUH)
024
036
048
060
-10 0 10 17 20 30 40 47 50 60
Based on Entering Indoor Air of 70 Deg. F and Rated CFM
23
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