Carrier 38AUZ Series - TROUBLESHOOTING; Compressor Operation Issues; System Performance Troubleshooting

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9. Interior a nd exterior finned areas must be thoroughly
cleaned.
10. Finned surfaces should remain wet with cleaning
solution 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 clean
water using downward rinsing motion of water spray
nozzle. Protect fins from damage from the spray
nozzle.
13. Replace top cover and rear corner posts.
FASTENER TORQUE VALUES
Table 10 – Torque Values
Compressor mounting bolts 65--- 75 in–lbs
(734–847 N–cm)
Condenser fan motor mounting bolts 20 2in–lbs
(226 23 N–cm)
Condenser fan hub setscrew 84 2in–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 5in–lbs
(791 57 N–cm)
TROUBLESHOOTING
PROBLEM SOL UTION
COMPRESSOR DOES NOT RUN
Contactor Open
1. Power off. 1. R estore power.
2. Fuses blown in field power circuit. 2. After finding cause and correc ting, replace with co rrect size fuse.
3. No control power . 3. Check cont ro l trans form e r primary connec ti o ns and ci rc ui t breaker.
4. Thermostat circuit open. 4. Check thermostat setting.
5. Safety device lockout circuit active. 5. Re set lockout circuit.
6. Low-pressure switch open. 6 . Chec k for re fri ger ant underchar ge, obst ruc ti o n of indo or airfl ow. Ma ke
sure liquid line solenoid valve(s) is open.
7. High-pressure switch open. 7. Check for refrigerant overcharge, obstruction of outdoor airflow , air in s ystem.
Be s ure out door fans are operating correctly.
8. Compressor overtemperature switch open. 8. Check for open condition. Allow for reset. Replace compressor if necessary.
9. Loose electrical connections. 9. Tighte n all c onne ct i ons .
10. Compressorstuck. 10. Seecompressorserviceliterature.
Contactor Closed
1. Compressor leads loose. 1. Check connec t io ns .
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 SWITCH
Outdoor Fan On
1. High-pressure switch faulty. 1. Rep lace switc h .
2. Reversed fan rotation. 2. Confirm rotat io n, correc t if nece ss ary.
3. Airflow restricted. 3. Remove obstru ction.
4. Air recirculating. 4. Clear airfl ow 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, expansio n valve, etc.
Outdoor Fan Off
1. Fanslipsonshaft. 1. Tightenfanhubsetscrews.
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