Lennox EL23XCV Series User Manual

Page 58
High Pressure Switch Protection Errors
TABLE 12. Outdoor Control 7-Segment Display Alert Codes
System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehu-
midi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 communicating thermostat.
Alert
Codes
Priority Alarm Description Possible Causes and Clearing Alarm
E 412 Moderate
The outdoor unit high pressure
switch has opened.
Unit pressure is above the upper limit. System is shut down. The high pressure
switch opens at 590PSIG and closes at 418PSIG. Conrm that the system is properly
charged with refrigerant. Check for clogged TXV, blockage to indoor unit blower
motor, clogged refrigerant lter. Conrm that the outdoor unit is clean. The alarm
clears after the pressure switch closes or a power reset.
For heating, indoor CFM may be set too low. For zoning system, zone CFM may be
set too low.
E 413 Critical
The high pressure switch has
opened 5 times within one hour. As
a result, the outdoor unit is locked
out.
Open high pressure switch error count reached 5 strikes. System is shut down. The
high pressure switch for HFC410A will open at 590PSIG and close at 418PSIG.
Conrm that the system is properly charged with refrigerant. Check condenser fan
motor, clogged TXV, blockage to indoor unit blower motor, stuck reversing valve or
clogged refrigerant lter. Conrm that the outdoor unit is clean. The alarm clears after
indoor power reset (24VAC power source to Outdoor Control)
Compressor Operation, Checkout and Status / Error Codes
OPERATION:
The EL23XCV uses two di󰀨erent types of compressor, depending on the specic model. The EL23XCV-024, -036 and
-048 use a 380VAC three phase variable capacity rotary compressor specically designed for unitary splits system and is
approved for use with HFC 410A refrigerant. The EL23XCV-060 unit uses a 380VAC three phase variable capacity scroll
compressor that is approved for use with HFC 410A refrigerant. The compressor, when connected to an inverter, is capa-
ble of operating in a running frequency range from 20 hertz up to a maximum of 70 hertz. (maximum hertz is dependent
on compressor size). The compressor speed is determined by thermostat demand and suction pressure when installed
with a conventional 24VAC non-communicating thermostat and by thermostat demand when installed with an S30/S40
thermostat.
CHECKOUT:
NOTE - The compressor motor winding resistance is the nominal resistance at 77F. When measuring compressor motor
winding resistance, the primary concern is the winding resistance between the dierent sets of terminals is within 10% of
each other. The actual winding resistance is impacted by temperature, refrigerant and oil. Do not automatically condemn a
compressor because the measured resistance is slightly higher or lower than the nominal resistance. Check for shorted/
open windings and for shorts to ground during testing.
0.883
0.883
0.883
0.883
0.883
0.705
0.705
ROTARY
COMPRESSOR
SCROLL
COMPRESSOR
(EL23XCV-060 only)
EL23XCV-024
EL23XCV-036
EL23XCV-048
EL23XCV-060
0.883
0.705
0.587
0.587
0.587
FIGURE 30. Compressor Operation, Checkout and Status/Error Codes

Lennox EL23XCV Series Specifications

General

Brand	Lennox
Model	EL23XCV Series
Category	Air Handlers
Language	English