Lennox ELS150S4D - 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
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 ELS150S4D Specifications

General

Brand	Lennox
Model	ELS150S4D
Category	Fan
Language	English

Summary

I-UNIT COMPONENTS

Control Box Components

Details transformer, terminal strips, capacitors, contactors, and relays within the control box.

Compressor Details

Describes the scroll compressors used in ELS units and their operational characteristics.

Head Pressure Control

Explains the system for maintaining head pressure at low ambient temperatures using pressure controls.

II- REFRIGERANT SYSTEM

Refrigerant Line Plumbing

Specifies liquid and suction line sizes for different ELS models and valid line set lengths.

Service Valve Operation

Provides instructions for operating and maintaining liquid and suction line service valves.

III-START-UP

Initial Startup Procedure

Outlines general steps for initiating unit operation, including thermostat settings and compressor phasing.

Compressor Phasing

Details how to ensure correct three-phase compressor rotation for optimal unit operation and prevent damage.

IV-CHARGING

Leak Testing and Evacuation

Covers procedures for leak detection using nitrogen and system evacuation to remove non-condensables.

Refrigerant Charging

Provides guidance on adding HFC-410A refrigerant based on model, line set length, and stages.

Charge Verification

Explains methods for checking refrigerant charge using normal operating and approach temperatures.

V-MAINTENANCE

Outdoor Unit Maintenance

Instructions for cleaning the outdoor coil and inspecting fan motor, wiring, and connections.

Indoor Unit Maintenance

Guidance on cleaning indoor coil, changing filters, and checking blower motor and wiring.

VI-Wiring Diagram and Sequence of Operation

Wiring Diagram Overview

Explains the electrical schematics, component key, and field wiring for ELS units.

Sequence of Operation

Describes the step-by-step electrical operation for cooling stages and compressor control.