Carrier 69NT40-541-505, Руководство по эксплуатации и обслуживанию, Страница: 62 / 143

T-368 4–32
AL12 EVAPORATOR FAN 2 IP
Cause: Alarm 12 is triggered when configured for single evap operation and KB10 sensed high.
Component Evaporator Fan 2
Troubleshooting The unit will suspend probe check diagnostic logic and disable the probe
check portion of defrost cycle.
Corrective Action AL11 is triggered off when KB10 sensed low.
AL15 LOSS OF COOLING
Cause: AL15 is triggered 30 minutes after the completion of a controller initiated probe check defrost if
Supply Temperature is more than 0.25°C (0.45°F) above set point. Refer to
Section 4.3.17 .
Component Refrigerant Level
Troubleshooting Power cycle the unit.
Corrective Action
Refer to Refrigerant Charge, Section 7.7
Power cycle the unit.
AL20 CONTROL CONTACTOR FUSE (F3)
Cause:
Control power fuse (F3A or F3B) is open.
Component Check F3A, if the fuse is open:
Troubleshooting Check PA, PB, CH coils for short to ground, if short is found:
Corrective Action
Replace the defective coil.
Replace the fuse.
Component Check F3B, if the fuse is open:
Troubleshooting Check CF, ES, EF, HR coils for short to ground, if short is found, coil is de-
fective.
Corrective Action
Replace the defective coil.
Replace the fuse.
Component Check Voltage at the output of F3A and F3B:
Troubleshooting If voltage is present at both F3A and F3B, it indicates a defective micropro-
cessor.
Corrective Action Refer to Controller Service Section 7.20 .
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