Lennox Core Unit Controller User Manual

43
Table 11. CORE Control System Alarm and Event Codes
SELECTED ALARMS (MARKED WITH * IN TABLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
CODE
DISPLAY MESSAGE EVENT ACTION
107* DUCT SUPPLY PRESS SENSOR
Check sensor and wiring.
The unit controller will set Supply Air Static Pressure Sensor (A30) error status if:
• Input signal is above 4.9” wc for more than 30 seconds.
OR
• Input signal is below 0.1”wc 20 seconds after the blower has started with setting at or
above Blower Output Static Duct Alarm Check.
The CORE Unit Controller will clear the Supply Air Static Pressure Sensor (A30) error
status and alarm after the expiration of Error Time OFF delay.
108 DUCT SUPPLY HIGH PRESS SENSOR
• Check sensor and wiring.
• The CORE Unit Controller will shutdown operation for Error Off time (Parameter 110)
if supply air static pressure exceeds supply static shutdown setpoint for 20 seconds
(default) Parameter 42.
• The CORE Unit Controller will clear High Supply Static (Duct) Pressure after Error Off
Time has expired and static duct pressure is below Supply Static Set Point Shutdown.
109*
STRIKE3 DUCT SUPPLY PRESS
SENSOR
• Check sensor and wiring.
• Unit controller shall “lock out” a unit operation after the Max Static Duct Pressure
Occurrences have occurred of Supply Static Pressure Sensor Error (alarm 107) and/
or High Supply Static (Duct) Pressure (alarm 108).
• User shall be able to clear supply static pressure lockout and alarm via User
Interface. Supply Static Pressure lockout and alarm shall be cleared after the unit
controller reset.
• The number of strikes is three by default. this can be changed using Parameter 43.
Optional occurrence setting is 1 to 7.
110 WAITING SENSOR DATA Check network or comfort sensor and wiring.
111 PROFILE ERROR Congurationproleunrecoverable.Settingsmayhavechanged.
112 INTERNAL EEPROM ERASE ERROR Internal EEPROM erase error.
113 INTERNAL EEPROM WRITE ERROR Internal EEPROM write error.
114 INTERNAL PLL CLOCK ERROR Internal PLL clock error.
115 TEST MODE UNIT TEST switch in test mode.
116 TEST MODE AT RESET UNIT TEST switch in test mode at reset.
117 HIBERNATION MODE
To insure correct voltage phasing before startup, use refrigerant pressure gauges to check
proper compressor operation and arrow label for blower rotation.
118 NO DISPLAY Display is not connected or communication lost
119 RESERVED
120 MCB CONFIGURATION ERROR
MCBcongurationerror.Casesthatcancausethisalarm:1-MCBnotpresent,butECTO
0.01 requires it. 2-MCB present, but ECTO 0.01 is not set for it
121* ID LINE FREQ MISMATCH
Power source line frequency is determined by the entered model number. This alarm is
enabled by the Phase Voltage Detection feature. The CORE Unit Controller does not have
an automatic clearing method, unit power cycle or reset will be required to re-evaluate the
phase sequence again.
122* 24VAC PRIMARY VOLTAGE LOW
• Low output voltage on T1 transformer. Alarm set when 24VAC voltage low if
calculated RMS voltage is below low voltage alarm threshold for more than two
seconds. System will stop unit operations (cooling, heating and ventilation). Low
voltage threshold is 18VAC.
• The CORE Unit Controller will clear alarm 24VAC Voltage Low if calculated RMS
voltage is above Low Voltage Alarm Threshold + 1 VAC for more than two seconds.
After the low 24VAC alarm has been cleared, the CORE Unit Controller will ignore all
service demands until the Error Time Off Delay has expired.
123* 24VAC PRIMARY VOLTAGE HIGH
• High output voltage on T1 transformer. Alarm set when 24VAC voltage high if
calculated RMS voltage is below low voltage alarm threshold for more than two
seconds. System will stop unit operations (cooling, heating and ventilation). Low
voltage threshold is 30VAC.
• The CORE Unit Controller will clear alarm 24VAC Voltage high if calculated RMS
voltage is above High Voltage Alarm Threshold + 1 VAC for more than two seconds.
After the HIGH 24VAC alarm has been cleared, the CORE Unit Controller will ignore
all service demands until the Error Time Off Delay has expired.

Lennox Core Unit Controller Specifications

General

Brand	Lennox
Model	Core Unit Controller
Category	Controller
Language	English