Lennox ELS SERIES

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
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.
WARNING
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
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.
Table of Contents
Unit Plumbing Parts Arrangement .................................5
Model Number Identication ........................................10
Unit Control Box Components Arrangement ................ 11
I-UNIT COMPONENTS ................................................12
A-CONTROL BOX COMPONENTS ............................12
B-COOLING COMPONENTS .......................................12
II- REFRIGERANT SYSTEM ....................................... 13
A-Plumbing ..................................................................13
B-Service Valves .........................................................14
III-START-UP ................................................................15
IV-CHARGING ..............................................................16
A-Leak Testing .............................................................. 16
B-Evacuating the System .............................................17
C-Charging ...................................................................18
V-MAINTENANCE ........................................................ 22
VI-Wiring Diagram and Sequence of Operation ...........23
ELS
6 - 20 TON
Service Literature
UNIT INFORMATION
Corp. 1811-L3
May 15, 2018
ELS SERIES UNITS
The ELS units are designed for light commercial applica-
tions, with a remotely located blower-coil unit or a furnace
with an add-on evaporator coil. Capacities for the series
are 6, 7-1/2, 10, 12.5, 15 and 20 tons (21, 26, 35, 44,
53, and 70 kW).ELS072, ELS090 and ELS120S4S mod-
els have one dual-speed scroll compressor. ELS120S4D,
ELS150S4D, ELS180S4D and ELS240S4D models have
two single-speed scroll compressors. ELS units match
with the ELA blower-coil units. All ELS units are three
phase and use HFC-410A refrigerant.
This manual covers ELS072S4S, ELS090S4S,
ELS120S4S, ELS120S4D, ELS150S4D, ELS180S4D and
ELS240S4D units. It is divided into sections which discuss
the major components, refrigerant system, charging pro-
cedure, maintenance and operation sequence.
Information in this manual is intended for qualied service
technicians only. All specications are subject to change.
Procedures in this manual are presented as a recommen-
dation only and do not supersede or replace local or state
codes.

Lennox ELS SERIES Specifications

General

Brand	Lennox
Model	ELS SERIES
Category	Fan
Language	English

Summary

UNIT INFORMATION & SERIES OVERVIEW

ELS SERIES UNITS INTRODUCTION

Introduces the ELS units, their capacities, models, and general design.

SPECIFICATIONS: 6 - 7.5 TON

GENERAL AND ELECTRICAL DATA

Details general and electrical data for 6 to 7.5 ton ELS units.

SPECIFICATIONS: 12.5 - 20 TON

GENERAL, ELECTRICAL, AND WEIGHT DATA

Details general, electrical, and weight data for 12.5-20 ton ELS units.

OPTIONS AND ACCESSORIES

ACCESSORY CATEGORIES AND INSTALLATION

Lists categories of options and accessories like Cabinet, Controls, Electrical, and IAQ.

UNIT PLUMBING PARTS ARRANGEMENT

PLUMBING COMPONENT LAYOUT DIAGRAMS

Illustrates the arrangement of plumbing components for ELS units across various models.

MODEL NUMBER IDENTIFICATION

DECODING ELS MODEL NUMBERS

Explains how to interpret the various parts of the ELS unit model numbers.

UNIT CONTROL BOX COMPONENTS ARRANGEMENT

CONTROL BOX COMPONENT LAYOUT DIAGRAMS

Shows the arrangement of components within the unit's control box for different models.

I-UNIT COMPONENTS: INTERNAL PARTS

INTERNAL UNIT COMPONENTS DESCRIPTION

Describes major internal components like compressors, capacitors, and contactors.

II- REFRIGERANT SYSTEM COMPONENTS

REFRIGERANT SYSTEM COMPONENTS DESCRIPTION

Details components of the refrigerant system, including piping and filter driers.

III- START-UP PROCEDURE

UNIT START-UP AND PHASING

Outlines the general procedure for starting the ELS units and ensuring correct compressor phasing.

IV- CHARGING PROCEDURES

LEAK TESTING AND REFRIGERANT CHARGING

Describes procedures for leak testing, evacuating, and charging the refrigerant system.

V- MAINTENANCE GUIDELINES

ROUTINE MAINTENANCE PROCEDURES

Provides guidelines for performing regular maintenance on the unit's outdoor and indoor sections.

VI- WIRING DIAGRAMS AND SEQUENCE OF OPERATION

WIRING DIAGRAMS AND OPERATION EXPLANATION

Explains wiring diagrams and sequences of operation for ELS units.