Outdoor Coil, Indoor Coil, And Condensate Drain Pan; Outdoor Fan; Electrical Controls And Wiring; Refrigerant Circuit - Carrier 50HS024-060 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 20.
The coils are easily cleaned when dry; therefore, inspect
and clean the coils either before or after each cooling sea-
son. 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 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
inside 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 outdoor 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 51 mm (2 in.) back from outdoor inlet grille or
13 mm ( 1 ⁄ in.) maximum from fan deck. See Fig. 29.
2
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.
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 17 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.
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 15.
suspected, refer to Refrigerant Charge section on page 15.
Indoor Airflow —
checking unless improper performance is suspected. If a prob-
lem exists, be sure that all supply- and return-air grilles are
open and free from obstructions, and that the air filter is clean.
When necessary, refer to Indoor Airflow and Airflow Ad-
justments section on page 17 to check the system airflow.
Metering Devices —
fixed orifices and are located in the inlet header to the indoor
and outdoor coils.
Liquid Line Strainers —
protect metering device) are made of wire mesh and are
located in the liquid lines on the inlet side of the metering
devices.
strainers. The strainers are the larger of the 2 components.
Inspect and check
21
After inspecting the electrical controls and wiring, re-
Inspect all refrigerant tubing con-
If oil is detected or if low performance is suspected, leak-
If no refrigerant leaks are found and low performance is
The indoor airflow does not require
Refrigerant metering devices are
Check valves are also located in the liquid lines near the
Fig. 29 — Fan Blade Clearance
The liquid line strainers (to