Carrier 38AUZ - Manual (Page 23)

23
Fig. 22 — CoreMax Access Port Assembly
FASTENER TORQUE VALUES
Table 8 — Torque Values
TROUBLESHOOTING
Compressor 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)
PROBLEM SOLUTION
COMPRESSOR DOES NOT RUN
Contactor Open
1. 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.
Make sure 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 if defective.
9. Loose electrical connections. 9. Tighten all connections.
10. Compressor stuck. 10. See compressor service literature.
Contactor Closed
1. 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 SWITCH
Outdoor Fan On
1. 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 Off
1. 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.
1/2-20 UNF RH
30°
0.596
.47 5/8” HEX
SEAT CORE
WASHER
DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
O-RING
45°
1/2" HEX
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
(Part No. EC39EZ067)