Service; Fastener Torque Values - Carrier 38AU Installation, Start-Up And Service Instructions Manual

7. Hold garden sprayer nozzle close to finned areas and
apply 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 finned
areas.
9. Interior and 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.
PROBLEM
COMPRESSOR DOES NOT RUN
Contactor Open
1. Power off.
2. Fuses blown in field power circuit.
3. No control power.
4. Thermostat circuit open.
5. Safety device lockout circuit active.
6. Low-pressure switch open.
7. High-pressure switch open.
8. Compressor overtemperature switch open.
9. Loose electrical connections.
10. Compressor stuck.
Contactor Closed
1. Compressor leads loose.
2. Motor windings open.
3. Single phasing.
COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH
Outdoor Fan On
1. High-pressure switch faulty.
2. Reversed fan rotation.
3. Airflow restricted.
4. Air recirculating.
5. Noncondensables in system.
6. Refrigerant overcharge.
7. Line voltage incorrect.
8. Refrigerant system restrictions.
Outdoor Fan Off
1. Fan slips on shaft.
2. Motor not running.
3. Motor bearings stuck.
4. Motor overload open.
5. Motor burned out.

FASTENER TORQUE VALUES

Compressor mounting bolts
Condenser fan motor mounting bolts
Condenser fan hub setscrew
High-flow service port
Schrader-type service check valve
Compressor oil sightglass thread
Compressor to Compressor rail torque
Compressor rail to base pan torque
TROUBLESHOOTING
1. Restore power.
2. After finding cause and correcting, replace with correct size fuse.
3. Check control transformer primary connections and circuit breaker.
4. Check thermostat setting.
5. Reset lockout circuit.
6. Check for refrigerant undercharge, obstruction of indoor airflow. Make
sure liquid line solenoid valve(s) is open.
7. Check for refrigerant overcharge, obstruction of outdoor airflow, air in system.
Be sure outdoor fans are operating correctly.
8. Check for open condition. Allow for reset. Replace compressor if necessary
9. Tighten all connections.
10. See compressor service literature.
1. Check connections.
2. See compressor service literature.
3. Check for blown fuse. Check for loose connection at compressor terminal.
1. Replace switch.
2. Confirm rotation, correct if necessary.
3. Remove obstruction.
4. Clear airflow area.
5. Recover refrigerant and recharge as required.
6. Recover refrigerant as required.
7. Consult power company.
8. Check or replace filter drier, expansion valve, etc.
1. Tighten fan hub setscrews.
2. Check power and capacitor.
3. Replace bearings.
4. Check overload rating. Check for fan blade obstruction.
5. Replace motor.
44
Table 13 – Torque Values
65--- 75 in–lbs
(734–847 N–cm)
20 ±2 in–lbs
(226 ±23 N–cm)
84 ±2 in–lbs
(949 ±136 N–cm)
96 ±10 in–lbs
(1085 ±23 N–cm)
2–3 in–lbs
(23–34 N–cm)
330 ±31 in–lbs
(23–34 N–cm)
120–168 in–lbs
(1356–1898 N–cm)
70 ±5 in–lbs
(791 ±57 N–cm)
SOLUTION