Lennox Elite EL18XPV Series

©2021 Lennox Industries Inc.
Dallas, Texas, USA
Page 1
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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, or service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
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.
INSTALLATION
INSTRUCTIONS
HEAT PUMP
508059-01
1/2021
Elite
®
Series EL18XPV Units
PACKING LIST
OUTDOOR UNIT
WARRANTY
CERTIFICAT E
RAST 6-PIN
CONNECTORS (2)
General
This EL18XPV outdoor air conditioner with all-aluminum
coil is designed for use with HFC-410A refrigerant only.
This unit must be installed with an approved indoor air
handler or coil. For AHRI Certied system match-ups and
expanded ratings, visit www.LennoxPros.com. The EL18X-
PV variable capacity unit may be installed with an S30
iComfort communicating thermostat or a standard 24VAC
non-communicating heat pump thermostat. See eld wiring
diagrams for wiring details. These instructions are intend-
ed as a general guide and do not supersede local codes
in any way. Consult authorities having jurisdiction before
installation.
NOTICE!
Charging information is given on the charging
procedure sticker on the unit access panel. For more in-
depth information, consult the Installation and Service
Procedures manual on LennoxPros.com or through the
Technical Support department at 800-453-6669.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 21 in this
instruction for information.
See
NOTES
See NOTES
NOTES:
Service clearance of 30 in. (762 mm) must be maintained on one of
the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in (914 mm).
Clearance to one of the remaining two sides may be 12 in. (305mm)
and the final side may be 6 in.(152 mm).
A clearance of 24 in. (610 mm) must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
See
NOTES
See NOTES
Control
Box
SETTING THE UNIT – Clearances

Lennox Elite EL18XPV Series Specifications

General

Compressor Type	Variable Speed
Refrigerant	R-410A
Energy Star Certified	Yes
Stages	Variable
Climate	All Climates
HSPF	10
Smart Technology	iComfort-enabled technology
Warranty	10-Year Limited Warranty on covered components
SEER	Up to 18

Summary

Installation Safety and Warnings

General Installation Warning

Warning regarding improper installation, adjustment, alteration, service, or maintenance.

Refrigerant Handling Compliance

Information on the Clean Air Act and proper refrigerant recovery methods.

Installation Safety Precautions

Panel Handling and Storage Safety

Warnings and precautions for handling and storing unit panels during installation.

Exhaust Vent Impact on Unit

Warning about exhaust gases affecting unit performance and longevity.

Refrigerant Piping Requirements

Oil Type and System Flushing

Details on PVE oil usage and flushing procedures for older systems.

Refrigerant Handling Safety

Critical warnings regarding safe handling of refrigerants and potential hazards.

Refrigerant Piping Installation Steps

Removing Indoor Metering Devices

Procedures for removing fixed orifice and expansion valve devices.

Flushing Line Set Procedure

Detailed steps for flushing the refrigerant line set using HCFC-22.

Connecting Equipment for Flushing

Diagram and instructions for connecting gauges and recovery machine.

Refrigerant Piping Brazing Procedures

Brazing Preparation and Safety

Steps for cutting, deburring, and preparing lines for brazing, including safety.

Manifold Gauge Set Connection for Brazing

Procedure for connecting manifold gauges and nitrogen for brazing.

Brazing Safety Warnings

Warnings about fire hazards and hazardous materials during brazing.

Brazing Line Set Connections

Wrapping Service Valves During Brazing

Instructions for protecting service valves with water-saturated cloths.

Cooling Brazed Joints

Procedure for cooling brazed joints after completion to protect valve seals.

Preparing for Next Installation Step

Steps after brazing, including disconnecting gauges and cooling pipes.

Indoor Expansion Valve Installation

Installing the Expansion Valve Unit

Steps for connecting the expansion valve to the indoor coil's orifice housing.

Sensing Bulb Installation and Positioning

Guidance on correctly installing and positioning the sensing bulb.

Equalizer Line Connection

Instructions for connecting the equalizer line to the check expansion valve.

Leak Testing and Evacuation

Connecting Gauge Set for Leak Test

Procedure for connecting the manifold gauge set to the system for testing.

Performing the Leak Test

Steps for pressurizing the system with nitrogen and checking for leaks.

Leak Test Warning

Warning regarding potential damage from deep vacuum operation.

System Evacuation Procedure

Connecting Gauge Set for Evacuation

Connecting the vacuum pump and gauges for system evacuation.

Evacuating to Target Vacuum Levels

Steps for reaching and verifying the required vacuum levels.

Evacuation Safety Warning

Warning about potential equipment damage and warranty voidance from improper evacuation.

Outdoor Unit Control Features

7-Segment Display and Push Button

Charge Mode Jumper Function

Operation Mode Jumper Settings

Unit Operation Modes Explained

iComfort S30 Variable Capacity Operation

Conventional 2-Stage Operation Details

Conventional Single-Stage Operation Details

Unit Start-Up Procedures

Initial Start-Up Checks

Post-Evacuation System Charging

Voltage and Refrigerant Checks

Refrigerant Charge Management

Checking and Adjusting Charge

Charge Adjustment for Line Length

System Service and Maintenance

Pre-Service Troubleshooting Checks

Professional Outdoor Unit Service

Professional Indoor Unit Service

General System Performance Test

Start-Up and Performance Checklist

Initial Start-Up Data Collection

Cooling Mode Performance Readings

Subcooling and Approach Calculation

Indoor Coil Temperature Drop Verification