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

5/8" HEX
Compressor mounting bolts
Condenser fan motor mounting bolts
Condenser fan hub setscrew
High-flow service port
Schrader-type service check valve
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.
SEAT
1/2-20 UNF RH
0.596
30°
.47
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
Fig. 22 — CoreMax Access Port Assembly

FASTENER TORQUE VALUES

Table 8 — Torque Values

TROUBLESHOOTING

CORE
(Part No. EC39EZ067)
WASHER
O-RING
1/2" HEX
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)
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 if defective.
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.
23
45°
DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
SOLUTION