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OVERLOAD SETPOINT WHEEL
CLASS 20
TEST
Fig. 10 — Motor Starter Setting
MAINTENANCE
Cleaning
The unit should be thoroughly cleaned inside and out. Frequency
of cleaning will depend on unit location and area conditions.
Drains must be kept free of dirt and trash. Coils can be cleaned
HP
0.50
0.75
1.00
1.50
2.00
3.00
5.00
7.50
10.00
PROBLEM
Unit will not Start
Fan does not Operate
Compressor is Noisy, but
will Start
Compressor Starts, but
does not Continue to Run
Unit is Noisy
LEGEND
TXV — Thermostatic Expansion Valve
MOTOR OVERLOAD RESET WHEEL
M
M-O
A-O
A
Table 12 — Condenser Motor Starter Settings
208-230 V
FLA
208V
1.8
2.5
3.4
4.6
6.0
9.2
14.5
21.5
28.0
Table 13 — Troubleshooting Procedure
POSSIBLE CAUSE
Loss of unit power
Unit voltage not correct
Open fuse
Open protection device
Unit or motor contactor out of order
Contactor or relay overload or out of order
Motor defective
Broken belt
Loose electrical contact
Under voltage
Defect in compressor motor
Missing phase
Compressor seized
Compressor or contact defect
Unit is not properly charged
Unit is oversized
Compressor is overloaded
Compressor noise
Tube vibration
Unit panel or part vibrating
with a stiff brush, vacuum cleaner, or compressed air. Coil can be
reached through access panels.
Inspection
Check coil baffles for tight fit to prevent air from bypassing the
coil. Check panels for air leakage, particularly those sealing the
fan and coil compartments. Check for loose electrical connections,
proper refrigerant charge, and refrigerant piping leaks.
Air Filters
Air filters may be installed on the condenser air inlet. Air filters
should be replaced or cleaned on a regular basis depending on
how dirty the operating environment is. Failure to clean air filters
regularly will result in loss of unit performance and possible nui-
sance tripping of the high-pressure switch.
TROUBLESHOOTING
Refer to Table 13 to determine the possible cause of the problem
and the associated procedure necessary to correct it.
For the low ambient option on the 09XC06,08 units, see Fig. 11
and for the 09XC12-24 units see Fig. 12.
460 V
FLA
230V
2.2
1.1
2.6
1.3
3.0
1.5
4.2
2.1
5.6
2.8
8.6
4.3
13.6
6.8
19.4
9.7
—
12.6
CORRECTION PROCEDURE
Check power source.
Check fuses, circuit breakers, disconnect switch.
Check electrical contacts.
Check and correct.
Check for short circuit in unit.
Check relays, contacts, pressure switches.
Test and replace if necessary.
Test and replace if necessary.
Test and replace if necessary.
Replace belt.
Tighten contact.
Check and correct.
Replace compressor.
Check and correct.
Check and replace if necessary.
Test and replace if necessary.
Check and correct any leaks. Adjust refrigerant charge.
Check heat load calculation.
Check protection device and replace.
Check for missing phase.
Check TXV.
Check temperature in suction discharge line.
Check TXV and replace if necessary.
Check internal noise.
Check and correct.
Check and tighten appropriate part.
16
575 V
FLA
0.9
1.0
1.1
1.6
2.1
3.4
5.4
7.5
10.1
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