Dc Inverter Control Operation - Lennox EL23XCV Series Manual

ERROR CODES:
TABLE 18. Outdoor Control 7-Segment Display Alert Codes – Outdoor Control Errors
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification).
Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
Alert codes are also displayed on the S30/S40 thermostat.
Alert
Priority
Codes
The S30/S40 thermostat has found
Moderate
E 180 a problem with the outdoor unit's
/ Critical
ambient temperature sensor.
Suction Temperature Sensor has
E 182 Moderate
malfunctioned
E 424 Moderate Faulty outdoor liquid line sensor
DC Inverter Control Operation, Checkout, Status / Error Codes
OPERATION OF COMPONENTS:
Electromagnetic compatibility circuit (EMC): EMC ensures the correct operation of different equipment items which use or
respond to electromagnetic phenomena. It also helps to negate the effects of interference.
CONVERTER:
Converts AC (alternating current) to DC (direct current).
POWER FACTOR CORRECTION (PFC) CIRCUIT:
The PFC module is an integrated part of the outdoor inverter that monitors the DC bus for high, low and abnormal voltage
conditions. If any of these conditions are detected, the PFC function and compressor will stop.
INTELLIGENT (INVERTER) POWER MODULE (IPM):
The IPM converts DC power into AC power. The control method is known as pulse width modulation (PWM). This means
the DC is switched on and off very quickly (chopped) by the transistor switches to make simulated AC at required frequen-
cy and voltage.
COMMUNICATION CONTROL CIRCUIT:
Receives and sends message between the inverter and the outdoor control.
STATUS CODES:
TABLE 19. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidifi-
cation). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are
displayed. Alert codes are also displayed on the S30/S40 thermostat.
Inverter LED Flash
Code (number of
Alert
flashes)
Codes
Green
Red LED
LED
N/A ON OFF
N/A ON ON
N/A OFF OFF
Alarm Description
During normal operation, after the outdoor control recognizes sensors, the alarm will
be sent only if valid temperature reading is lost. Compare outdoor sensor resistance
to temperature/resistance charts in unit installation instructions. Replace sensor pack
if necessary. At the beginning of (any) configuration, furnace or air-handler control
will detect the presence of the sensor(s). If detected (reading in range), appropriate
feature will be set as 'installed' and shown in the S30/S40 thermostat 'About' screen.
The alarm / fault will clear upon configuration, or sensing normal values.
Sensor is open or shorted. Replace the Sensor
Sensor is open or shorted. Replace the sensor.
Prority Alarm Description
N/A EL23XCV-024, -036 only: Indicates inverter is operating normally.
N/A EL23XCV-048, -060 only: Indicates inverter is operating normally.
N/A Indicates inverter is NOT energized.
Possible Causes and Clearing Alarm
Possible Causes and Clearing Alarm
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