Step 4 — 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.
Step 5 — Outdoor Fan
!CAUTION
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.
1.Shut off unit power supply and install lockout tag.
2.Remove
3.Loosen fan hub setscrews.
4.Adjust fan height as shown in Fig. 19.
5.Tighten setscrews.
6.Replace
A08004
Fig. 19 - Outdoor Fan Adjustment
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 access 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,
Check to ensure no wires are touching refrigerant tubing or sharp sheet metal edges. Move and secure wires to isolate from tubing and sheet metal edges.
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 checks.
Step 7 — Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil accumulation 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
If no refrigerant leaks are found and low performance is suspected, refer to Checking and Adjusting Refrigerant Charge section.
Step 8 — Indoor Airflow
The heating and/or cooling airflow does not require checking unless improper performance is suspected. If a problem exists, be sure that all supply- and
Step 9 — Metering Devices
Refrigerant cooling metering device is an AccuRater
Step 10 — Liquid Line Strainers
The liquid line strainers (to protect metering devices) are made of wire mesh and are located in the liquid lines on the inlet side of the metering devices.
Step 11 — High Flow Valves
High flow valves are located on the compressor hot gas and suction tubes. Large black plastic caps distinguish these valves with
TROUBLESHOOTING
Refer to the Troubleshooting Chart (Table 9) for troubleshooting information.
START-UP CHECKLIST
Use the
664B
19
