Outdoor Coil, Indoor Coil, And Condensate; Drain Pan; Outdoor Fan; Electrical Controls And Wiring - Carrier 50HS018 Installation, Start-Up And Service Instructions Manual

c. Lift wheel from housing. When handling and/or clean-
ing blower wheel, be sure not to disturb balance weights
(clips) on blower wheel vanes.
d. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush at-
tachment. Remove grease and oil with mild solvent.
e. Reassemble wheel and cut-off plate into housing.
f. Reassemble motor into housing. Be sure setscrews are
tightened on motor-shaft flats and not on round part of
shaft.
Outdoor Coil, Indoor Coil, and Condensate Drain
Pan —
Inspect the outdoor coil, indoor coil, and conden-
sate drain pan at least once each year. Proper inspection and
cleaning requires the removal of the unit top. See Unit Top
Removal section on page 28.
The coils are easily cleaned when dry; 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 outdoor coil. Straighten bent
fins with a fin comb. If coated with dirt or lint, clean the
coils with a vacuum cleaner, using a 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 low-velocity water, using a garden hose. Be
careful not to splash water on motors, insulation, wiring, or
air filter(s). For best results, spray outdoor coil fins from in-
side to outside the unit. On units with an outer and inner
outdoor 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 in-
specting the coils. Clean the drain pan and condensate drain
by removing all foreign matter from 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 ''plumbers snake'' or similar probe
device. Ensure that the auxiliary drain port above the drain
tube is also clear.

Outdoor Fan

Keep the condenser fan free from all obstructions to en-
sure proper cooling operation. Never place articles on
top of the unit. Damage to unit may result.
1. Remove screws at bottom of outdoor air intake grille and
remove plastic grille.
2. Inspect the fan blades for cracks or bends.
3. If fan needs to be removed, loosen the setscrew and slide
the fan off the motor shaft.
4. When replacing fan blade, position blade so that leading
edge is 2 in. back from outdoor inlet grille or
mum from the fan deck. See Fig. 30.
5. Ensure that setscrew engages the flat area on the motor
shaft when tightening.
Electrical Controls and Wiring —
the electrical controls and wiring annually. Be sure to turn
off the electrical power to the unit.
Remove the control/blower and compressor compartment
access panels to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten all screw
connections. If any smoky or burned connections are no-
ticed, disassemble the connection, clean all the parts, restrip
the wire end and reassemble the connection properly and
securely.
After inspecting the electrical controls and wiring, re-
place all the panels. Start the unit, and observe at least one
complete cooling cycle to ensure proper operation. If dis-
crepancies are observed in operating cycle, or if a suspected
malfunction has occurred, check each electrical component
with the proper electrical instrumentation. Refer to the unit
wiring label when making these checkouts.
NOTE: Refer to the Sequence of Operation section on
page 22 as an aid in determining proper control operation.
Refrigerant Circuit —
nections and the unit base for oil accumulations annually.
Detecting oil generally indicates a refrigerant leak.
If oil is detected or if low performance is suspected, leak-
test all refrigerant tubing using an electronic leak detector,
or liquid-soap solution. If a refrigerant leak is detected, refer
to Check for Refrigerant Leaks section on page 18.
If no refrigerant leaks are found and low performance is
suspected, refer to Checking and Adjusting Refrigerant Charge
1 ⁄ in. maxi-
2
section on page 18.
29
Fig. 30 — Fan Blade Clearance
Inspect all refrigerant tubing con-
Inspect and check