Lennox Core Unit Controller Setup Manual page 46

SELECTED ALARMS (MARKED WITH * IN TAbLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
DISPLAY MESSAGE
CODE
188 INVERTER MAJOR
189 INVERTER FATAL
190 INVERTER COMM
191 INVERTER VOLTAGE MISMATCH
192 HIGH TEMP S7 OPEN COMP1
193 STRIKE3 HIGH TEMP S7 OPEN COMP1
CRITICAL LOSS CONDENSER
194
AIRFLOW
195 C1 CRITICAL LOSS OF CHARGE
196 C2 CRITICAL LOSS OF CHARGE
197 C3 CRITICAL LOSS OF CHARGE
198 C4 CRITICAL LOSS OF CHARGE
CRITICAL LOSS OF EVAPORATOR
199
AIRFLOW
200 C1 NON OPERATING COMPRESSOR
201 C2 NON OPERATING COMPRESSOR
202 C3 NON OPERATING COMPRESSOR
203 C4 NON OPERATING COMPRESSOR
204 C1 TXV FAILED CLOSED
205 C2 TXV FAILED CLOSED
206 C3 TXV FAILED CLOSED
207 C4 TXV FAILED CLOSED
208 C1 MAJOR LOSS CHARGE
209 C2 MAJOR LOSS CHARGE
210 C3 MAJOR LOSS CHARGE
211 C4 MAJOR LOSS CHARGE
Table 11. CORE Control System Alarm and Event Codes
EVENT ACTION
• Alarming Value = Inverter error code
• Possible alarming values for unit controller alarm 188 are:
>
>
>
>
>
>
>
>
>
• No action required. Compressor stops for the duration of the minimum run time. Unit
shuts down after ten occurrences in one hour and Alarm 189 is initiated. Alarm 188
will automatically clear when inverter error clears.
• Refer to trouble shooting guide in service manual for more information.
• Alarming Value = Inverter error code
• Possible alarming values for alarm 189 are 21, 22, 23, 26, 28, 29, 61, 62 and 75.
• Alarm 189 will clear upon manual reset.
• Refer to trouble shooting guide in service manual for more information.
Unable to communicate with inverter. The unit controller will disable compressor operation.
Replace communication cable between inverter and CORE Unit Controller. If alarm
continues, replace CORE Unit Controller or inverter.
The unit controller will disable compressor operation. Replace with correct inverter part.
Check temperature trip switch. Compressor is off. Also check charge, fans and coil. The
unit controller will clear the temperature trip alarm when corresponding compressor top
cap temperature trip switch is detected as closed. Compressor will not restart until the
corresponding temperature trip switch is closed and the minimum off delay has expired.
The unit controller will disable compressor operation (lockout). Check switch, charge, fans
and coil. Default is three occurrences. Alarm will be automatically cleared after removal of
cooling demand.
Critical Loss of Condenser Airflow
Critical Loss of Charge Compressor 1. In Model L this is determined by temperature
readings from sensors on the coils.
Critical Loss of Charge Compressor 2. In Model L this is determined by temperature
readings from sensors on the coils.
Critical Loss of Charge Compressor 3. In Model L this is determined by temperature
readings from sensors on the coils.
Critical Loss of Charge Compressor 4. In Model L this is determined by temperature
readings from sensors on the coils.
Critical Loss of Evaporator Airflow
Compressor 1 Not Operating
Compressor 2 Not Operating
Compressor 3 Not Operating
Compressor 4 Not Operating
Compressor 1 TXV Failed Closed
Compressor 2 TXV Failed Closed
Compressor 3 TXV Failed Closed
Compressor 4 TXV Failed Closed
Major Loss of Charge Compressor 1
Major Loss of Charge Compressor 2
Major Loss of Charge Compressor 3
Major Loss of Charge Compressor 4
21 - Peak DC current
22 - Maximum current reached lockout
23 - DC Link low voltage
26 - Locked Rotor
28 - DC Link high voltage
29 - Compressor over current
61 - Low outdoor ambient inverter lockout
62 - High Heat Sink Temperature lockout
75 - Low Input Voltage
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