Lennox EL15KC1 Series Manual

Service Literature
EL15KC1 (R-454B) SERIES UNITS WITH ALL-ALUMINUM COIL
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.
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
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components when
unit is not in operation on units with single-
pole contactors. Disconnect all remote electric
power supplies before opening access panel.
Unit may have multiple power supplies.
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.
UNIT INFORMATION
Corp. 100120
January 21, 2025

Table of Contents

Model Number Identification ...........................................5
Specifications ................................................................6
Unit Dimensions - Inches (mm) ....................................8
Typical Unit Parts Arrangement .....................................9
Component Specifications ...........................................10
Refrigerant Metering Device - Indoor Coil ...................10
Operating Gauge Set and Service Valves ....................10
Installation ....................................................................12
Unit Placement ............................................................12
Removing and Installing Louvered Panels ...................14
New or Replacement Line Set ......................................15
Brazing Connections ...................................................18
Flushing Line Set and Indoor Coil ................................21
Installing Indoor Metering Device .................................22
Leak Testing the System .............................................23
Evacuating Line Set and Indoor Coil ...........................24
Electrical - Circuit Sizing and Wire Routing ..................25
Maintenance ...............................................................29
Typical Field Wiring ......................................................31
Servicing Units Delivered Void of Charge ...................32
Unit Start-Up ...............................................................33
System Refrigerant .....................................................33
Decommissioning ........................................................35
Start-Up Test Procedure ...............................................37
This unit must be matched with an indoor coil as
specified with AHRI. For AHRI Certified system match-
ups and expanded ratings, visit www.LennoxPros.com.
General Information
This EL15KC1 outdoor air conditioner with all-aluminum
coil is designed for use with R-454B refrigerant only. This
unit must be installed with an approved indoor air handler
or coil. For AHRI Certified system match-ups and expand-
ed ratings, visit www.LennoxPros.com. These instructions
are intended as a general guide and do not supersede
local codes in any way. Consult authorities having jurisdic-
tion before installation.
This outdoor unit is designed for use in systems that use
the following refrigerant metering device:
• Thermal expansion valve (TXV)
IMPORTANT: Special procedures are required for clean-
ing the aluminum coil in this unit. See page 29 in this man-
ual for information.
Page 1
EL15KC1
IMPORTANT