Lennox Prodigy 2.0 Application Manual page 143

ALARM ALARM
TYPE TYPE
CODES CODES
DISPLAY MESSAGE
123 ALARM 24VAC PRIMARY VOLTAGE HIGH
124 ALARM 24VAC SECONDARY VOLTAGE LOW
125 ALARM 24VAC SECONDARY VOLTAGE HIGH
LINE PHASING DOES NOT MATCH UNIT
126 ALARM
CONFIG
127 - 128 RESERVED
129 ALARM VFD SHUTDOWN
130 ALARM VFD BYPASS ENGAGED
131 RESERVED
132 ALARM VFD BYPASS NOT CONFIGURED
133 RESERVED
134 ALARM ADVANCE AIRFLOW LOW SUPPLY CFM
135 ALARM ADVANCE AIRFLOW NO AIRFLOW
ADVANCE AIRFLOW OUTSIDE AIR
136 ALARM
DAMPER/ECON MECHANICAL FAULT
ADVANCE AIRFLOW LOW OUTDOOR AIR­
137 ALARM
FLOW
138 RESERVED
ADVANCE AIRFLOW OUTDOOR AIRFLOW
139 ALARM
TOO HIGH
ADVANCE AIRFLOW CFM UNATTAINABLE ­
140 ALARM
TARGET TOO LOW
ADVANCE AIRFLOW CFM UNATTAINABLE ­
141 ALARM
TARGET TOO HIGH
142 RESERVED
TABLE 66. PRODIGY 2.0 ALARM CODES
Event Action
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 M3 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 M3 unit controller will
ignore all service demands until the Error Time Off Delay has expired.
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 M3 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 M3 unit controller will
ignore all service demands until the Error Time Off Delay has expired.
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 M3 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 M3 unit controller will
ignore all service demands until the Error Time Off Delay has expired.
during power up or reset of unit, Mismatch on single or 3­phase power, or reverse rotation on 3­phase detected. This alarm
is enabled by the Phase­Voltage Detection feature.
VFD fault detected. Check belt and for blower overload. Fix source of fault and reset M3 unit controller.
VFD bypass mode. Mode is engaged. Blower may or may not be disengage.
VFD bypass mode has not been selected. Unit operates as if bypass is not installed.
Advance Airflow enabled RTU ­ indicates airflow target cannot be achieved. Check cause of airflow reduction such as dirty
filter, changes in duct work, etc
Blower RPM is too low as indicates by blower status. This means that the blower is not working. Repair blower and reset
M3 unit controller.
Outdoor air damper stuck or actuator problem.
Outdoor airflow is too low so the building is not getting the designed outdoor airflow based on IAQ.
Ventilation CFM is too high so the RTU is wasting energy.
verify the MSAV blower settings and set the CM targets below set CFM. The alarm value will be displayed on the M3 Unit
Controller screen.
verify the MSAV blower settings and set the cm targets below set CFM. The alarm value will be displayed on the M3 Unit
Controller screen.