Carrier 38AU appendix Fastener Torque Values, Troubleshooting

38AU

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.

FASTENER TORQUE VALUES

Table 13 – Torque Values

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)
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)

TROUBLESHOOTING

	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 compressor if necessary
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.

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