Carrier 38AU Installation, Start-up And Service Instructions Manual

Also see for 38AU: Installation, Start-Up and Service Instructions Installation, Start-Up and Service Instructions

Carrier 38AU Installation, Start-up And Service Instructions Manual Manual pdf 44 page image

447. Hold garden sprayer nozzle close to finned areas andapply cleaner with a vertical, up-and-down motion.Avoid spraying in horizontal pattern to minimize po-tential for fin damage.8. Ensure cleaner thoroughly penetrates deep into finnedareas.9. Interior and exterior finned areas must be thoroughlycleaned.10. Finned surfaces should remain wet with cleaningsolution for 10 minutes.11. Ensure surfaces are not allowed to dry before rinsing.Reapply cleaner as needed to ensure 10-minute satur-ation is achieved.12. Thoroughly rinse all surfaces with low velocity cleanwater using downward rinsing motion of water spraynozzle. Protect fins from damage from the spraynozzle.13. Replace top cover and rear corner posts.FASTENER TORQUE VALUESTable 13 – Torque ValuesCompressor mounting bolts 65--- 75 in–lbs(734–847 N–cm)Condenser fan motor mounting bolts 20 ±2 in–lbs(226 ±23 N–cm)Condenser fan hub setscrew 84 ±2 in–lbs(949 ±136 N–cm)High-flow service port 96 ±10 in–lbs(1085 ±23 N–cm)Schrader-type service check valve 2–3 in–lbs(23–34 N–cm)Compressor oil sightglass thread 330 ±31 in–lbs(23–34 N–cm)Compressor to Compressor rail torque 120–168 in–lbs(1356–1898 N–cm)Compressor rail to base pan torque 70 ±5 in–lbs(791 ±57 N–cm)TROUBLESHOOTINGPROBLEM SOLUTIONCOMPRESSOR DOES NOT RUNContactor Open1. Power off. 1. Restore power.2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse.3. No control power. 3. Check control transformer primary connections and circuit breaker.4. Thermostat circuit open. 4. Check thermostat setting.5. Safety device lockout circuit active. 5. Reset lockout circuit.6. Low-pressure switch open. 6. Check for refrigerant undercharge, obstruction of indoor airflow. Makesure liquid line solenoid valve(s) is open.7. High-pressure switch open. 7. Check for refrigerant overcharge, obstruction of outdoor airflow, air in system.Be sure outdoor fans are operating correctly.8. Compressor overtemperature switch open. 8. Check for open condition. Allow for reset. Replace compressor if necessary9. Loose electrical connections. 9. Tighten all connections.10. Compressor stuck. 10. See compressor service literature.Contactor Closed1. Compressor leads loose. 1. Check connections.2. Motor windings open. 2. See compressor service literature.3. Single phasing. 3. Check for blown fuse. Check for loose connection at compressor terminal.COMPRESSOR STOPS ON HIGH-PRESSURE SWITCHOutdoor Fan On1. High-pressure switch faulty. 1. Replace switch.2. Reversed fan rotation. 2. Confirm rotation, correct if necessary.3. Airflow restricted. 3. Remove obstruction.4. Air recirculating. 4. Clear airflow area.5. Noncondensables in system. 5. Recover refrigerant and recharge as required.6. Refrigerant overcharge. 6. Recover refrigerant as required.7. Line voltage incorrect. 7. Consult power company.8. Refrigerant system restrictions. 8. Check or replace filter drier, expansion valve, etc.Outdoor Fan Off1. Fan slips on shaft. 1. Tighten fan hub setscrews.2. Motor not running. 2. Check power and capacitor.3. Motor bearings stuck. 3. Replace bearings.4. Motor overload open. 4. Check overload rating. Check for fan blade obstruction.5. Motor burned out. 5. Replace motor.38AU