Lennox EL23XCV Series User Manual

Page 1
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
IMPORTANT
This unit must be matched with an indoor coil as specied
with AHRI. For AHRI Certied system match-ups and
expanded ratings, visit www.LennoxPros.com. Coils
previously charged with HCFC-22 must be ushed.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
WARNING
To prevent serious injury or death:
1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the “OFF” position before
performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
EL23XCV
Table of Contents
Model Number Identication ...........................................2
Typical Serial Number Identication ...............................2
Specications ................................................................3
Electrical Data ...............................................................3
Unit Dimensions – Inches (mm) ....................................4
Typical Unit Parts Arrangement ..................................... 5
Operating Gauge Set and Service Valves ......................8
Installation ....................................................................10
Unit Placement ............................................................10
Removing and Installing Panels ...................................13
New or Replacement Line Set ......................................14
Brazing Connections ...................................................17
Flushing Line Set and Indoor Coil ................................20
Leak Testing the System .............................................22
Evacuating Line Set and Indoor Coil ...........................24
Servicing Units Delivered Void of Charge ...................34
Unit Start-Up ...............................................................34
System Operation and Service ...................................35
Unit Selection Code for Outdoor Control ..................... 43
Conguring Unit ............................................................46
Reconguring Outdoor Control using S30/S40 Thermo-
stat ................................................................................47
System Overview..........................................................47
Diagnostic Information - Installations with S30/S40 Ther-
mostat ...........................................................................47
Installer Test - Installations with S30/S40 Thermostat .. 47
Maintenance .................................................................48
Unit Wiring Diagrams....................................................49
Unit Sequence of Operation ........................................50
Component Testing .......................................................53
6-Pin Sensor Harness (DIS, AMB, COIL) .................... 68
4-Pin Suction Temperature Sensor / Liquid Temperature
Sensor Harness ...........................................................68
System Refrigerant .......................................................76
Charge Mode Jumper ..................................................76
Service Literature
UNIT INFORMATION
Corp. 100040
February 14, 2023
EL23XCV (HFC-410A) SERIES OUTDOOR UNITS

Lennox EL23XCV Series Specifications

General

Refrigerant	R-410A
Voltage	208/230V
Model	EL23XCV
Cooling Capacity	Up to 5 tons
Stages	Variable Speed
Cabinet	Galvanized steel
Airflow	Variable
Motor Type	Variable-speed ECM

Summary

Specifications

Electrical Data

Details electrical requirements and data for the unit.

Typical Unit Parts Arrangement

Control Panel Components

Illustrates control panel components for different models.

Brazing Connections and Safety

Brazing Precautions and Hazards

Covers fire hazards, gas usage, health precautions, and valve cooling.

Leak Testing the System

Leak Testing Precautions and Requirements

Covers EPA regulations, flushing, gas usage, leak detectors, and refrigerant hazards.

System Leak Test Procedure

Connecting Gauge Set for Leak Test

Performing the Leak Test

Procedure for testing the line set and indoor unit for leaks.

Evacuating Line Set and Indoor Coil

Connecting Gauge Set for Evacuation

System Evacuation Procedure

Procedure for evacuating the system to a specific micron level.

Outdoor Unitary Control Features

Mode Jumpers (Charge and Operation)

Details on installing and using mode jumpers.

Unit Operation Modes

Operation with Different Thermostats

Explains unit operation with S30/S40 and conventional thermostats.

Outdoor Control Terminal Designations (Cont'd)

Charge Mode Functionality

Details the charge mode function and its operation.

Servicing Units Void of Refrigerant

Unit Start-Up Procedures

Procedures for starting up the unit after service.

System Operation and Service

Alert and Status Codes

Explains alert codes displayed on the 7-segment display.

Resetting Alert Codes

Outdoor Control Alert Codes

Outdoor Control Alert Codes (Cont'd)

Inverter LED Flash Code Information (Cont'd)

Error Code Recall and Field Test Modes

Field Test, Diagnostic, and Fan Modes

Charge Mode Operation

Details the charge mode function.

Reconfiguring Outdoor Control with S30/S40 Thermostat

System Overview and Compressor Protection

Overview of outdoor control functions and compressor protection.

Diagnostic Information and Installer Tests

Maintenance Procedures

Outdoor Unit and Coil Maintenance

Regular maintenance checks for the outdoor unit and coil.

Indoor Unit and Coil Maintenance

Unit Wiring Diagrams

Typical Unit Wiring Diagram

Provides a typical wiring diagram for the unit.

Unit Sequence of Operation

Power-Up, Reset, and Control Functions

Diagnostic Screens

Component Testing

Pressure Switch and Protection Testing

Details on verifying high pressure switch and low pressure protection.

High Pressure Switch Checkout

Suction Pressure Transducer Testing

Liquid Pressure Transducer Testing

Transducer Voltage and Output Data

High Pressure Switch Protection Errors

Compressor Operation and Error Codes

Details compressor operation, checkout, and error codes.

Compressor Alert Codes

Compressor Error Codes

Details error codes specific to compressor issues.

Crankcase Heater Operation and Testing

Crankcase Heater and Thermostat Checks

Liquid Line Filter Drier and Top Cap Switch

Top Cap Switch Operation and Errors

Details the top cap switch operation and error codes.

Reactor Operations and Fan Control

Reactor Operations and Checkout

Outdoor Fan Operation and Checkout

Details outdoor fan operation and checkout procedures.

Electrical Checks

VAC Voltage Check

Procedure for checking VAC voltage at the inverter contactor.

Outdoor Control Operation and Codes

Status and Error Codes

Outdoor Control Error Codes

Unit Sensor Operation and Errors

Details unit sensor operations and error codes.

DC Inverter Control Errors

Inverter Alert Codes

Lists alert codes and inverter LED flash codes.

Outdoor Control Alert Codes (Inverter Flash)

Inverter LED Flash Code Information

System Refrigerant Handling

Charging Precautions and Refrigerant Notes

Emphasizes operating at 100% capacity for charging and refrigerant notes.

Charge Mode Operation and Gauge Set Connections

Charge Mode Operation with Thermostats

Explains charge mode operation with S30/S40 and conventional thermostats.

Gauge Set Connections for Charging

Illustrates gauge set connections for testing and charging.

Charging Procedures

Weigh-In Charging Method

Details the weigh-in method for charging refrigerant.

Subcooling Charging Method

Temperature-Pressure Data Table