Lennox EL23XCV Series User Manual

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TABLE 14. Outdoor Control 7-Segment Display Alert Codes - Top Cap Switch
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or de-
frost/dehumidi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 422 Moderate
Compressor top cap switch
exceeding thermal limit.
The top of the compressor is hot. Refrigerant charge may be low, or low mass ow
of refrigerant. Check TXV, clogged lter drier, condenser fan motor, indoor blower
motor, conrm indoor coil is clean. Check to make sure the blue wires from the
top thermostat did not get pulled o󰀨 one of the TP terminal on the outdoor control
board.
E 442 Critical
The top cap switch has opened 5
times within one hour. As a result,
the outdoor unit is locked out.
When compressor thermal protection sensor opens 5 times within 1 hour, outdoor
stops working.
To clear, disconnect power to the indoor unit (24VAC power source to the outdoor
control) which will power o󰀨 the outdoor control and will open the outdoor unit
contactor, which interrupts power to the inverter and then re-apply power.
Reactor Operations, Checkout and Status / Error Codes
OPERATION:
Reactor (Inductor or choke) is a passive two-terminal electrical component that stores energy in its magnetic eld. Reac-
tors are one of the basic components used in electronics where current and voltage change with time, due to the ability of
inductors to delay and reshape alternating currents.
CHECKOUT:
Main Power ON – Voltage IN reactor should be the same as the voltage OUT. With main power OFF and reactor discon-
nected from system; resistance between leads should be the same
STATUS CODES:
None
ERROR CODES:
None
VOLTAGE “IN”
VOLTAGE “OUT”
FIGURE 41. EL23XCVS/E18XCV Reactor
Outdoor Fan Operation and Checkout
OPERATION:
EL23XCV units have a variable speed ECM fan motor. The variable speed ECM fan motor is controlled by PWM fan output
when the compressor is running and will vary the fan speed to match the compressor capacity.
LOW AMBIENT OPERATION:
The EL23XCV units have factory installed low ambient operator that will control the condenser fan motor based upon liquid
line temperature.
EL23XCV units have a variable speed ECM fan motor. The outdoor control will begin to modulate the outdoor fan motor
speed is below 65°F to maintain a liquid line sensor temperature between 58°F and 70°F. If the liquid line sensor drops
below 55°F the control will cycle the fan o󰀨 until liquid temperature rises above 58°F.

Lennox EL23XCV Series Specifications

General

Brand	Lennox
Model	EL23XCV Series
Category	Air Handlers
Language	English