14
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.
Step 5 — Condenser Fan
UNIT OPERATION HAZARD
Failure to follow this caution may result in damage to unit
components.
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of
unit.
CAUTION
!
1. Shut off unit power supply.
2. Remove condenser--fan assembly (grille, motor, motor
cover, and fan) by removing screws and flipping assembly
onto unit top cover.
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 20.
5. Tighten setscrews.
6. Replace condenser--fan assembly.
Step 6 — Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove the top panel 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
noticed, disassemble the connection, clean all the parts, restrip the
wire end and reassemble the connection properly and securely.
3.125 in.
C00021
Fig. 20 -- Condenser--Fan Adjustment
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies 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, as an aid in
determining proper control operation.
Step 7 — Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulations annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low cooling 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
If no refrigerant leaks are found and low cooling performance is
suspected, refer to Refrigerant Charge section.
Step 8 — Evaporator Airflow
The cooling airflow does not require checking unless improper
performance is suspected. If a problem 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 Adjustments section to check the system
airflow.
Step 9 — Metering Devices
Refrigerant metering devices are fixed orifices and are located in
the inlet header to the evaporator coil.
Step 10 — Liquid Line Strainer
The liquid line strainer (to protect metering device) is made of wire
mesh and is located in the liquid line on the inlet side of the
metering device.
TROUBLESHOOTING
Refer to the Troubleshooting Chart (Table 5) for troubleshooting
information.
START--UP CHECKLIST
Use the Start--Up Checklist at the back of this manual.
50Z
P
