Carrier 50SZ Series Installation, Start-up And Service Instructions Manual

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Contents

2. If fan needs to be removed, remove screws holding outdoor airintake grille and remove grille.3. Loosen the setscrew and slide the fan off the motor shaft.4. When replacing fan blade, position blade so that the hub is 1/8in. (See Fig. 18) away from the motor end (1/8 in. of motorshaft will be visible) .5. Ensure that setscrew engages the flat area on the motor shaftwhen tightening.6. Replace grille.Step 5—Electrical controls and wiringInspect and check the electrical controls and wiring annually. Besure to turn off the electrical power to the unit and install lockouttag.Remove access panel to locate all the electrical controls andwiring. Check all electrical connections for tightness. Tighten allscrew connections. If any smoky or burned connections arenoticed, disassemble the connection, clean all the parts, restrip thewire end and reassemble the connection properly and securely.After inspecting the electrical controls and wiring, replace all thepanels. Start the unit, and observe at least one complete coolingcycle to ensure proper operation. If discrepancies are observed inoperating cycle, or if a suspected malfunction has occurred, checkeach electrical component with the proper electrical instrumenta-tion. Refer to the unit wiring label when making these checkouts.NOTE: Refer to the Sequence of Operation section as an aid indetermining proper control operation.Step 6—Refrigerant circuitInspect all refrigerant tubing connections and the unit base for oilaccumulation annually. Detecting oil generally indicates a refrig-erant leak.EXPLOSION, PERSONAL INJURY HAZARDFailure to follow this warning could result in personal injury,death, or property damage.System under pressure. Relieve pressure and recover allrefrigerant before system repair or final unit disposal to avoidserious injury or death. Use all service ports and open allflow-control devices, including solenoid valves.If oil is detected or if low performance is suspected, leak-test allrefrigerant tubing using an electronic leak detector, or liquid-soapsolution. If a refrigerant leak is detected, refer to Check forRefrigerant Leaks section.If no refrigerant leaks are found and low performance is suspected,refer to Checking and Adjusting Refrigerant Charge section.Step 7—Indoor airflowThe indoor airflow does not require checking unless improperperformance is suspected. If a problem exists, be sure that allsupply- and return-air grilles are open and free from obstructions,and that the air filter is clean. When necessary, refer to IndoorAirflow and Airflow Adjustments section to check the systemairflow.Table 8—Cooling Charging ChartA0510917

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