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Lennox ELXA Series

Lennox ELXA Series
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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.
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.
Table of Contents
SPECIFICATIONS .......................................................... 2
BLOWER DATA ..............................................................4
I - UNIT COMPONENTS ..............................................19
II − REFRIGERATION SYSTEM ..................................20
III − BLOWER SPEED & BELT TENSION ....................20
IV − Electric Heat Components ....................................21
Supply Air Inverter Startup............................................22
Verify Proper Operation ................................................ 23
Sequence of Operation ................................................24
ELXA
6 – 20 TONS
Service Literature
UNIT INFORMATION
100069
April 20, 2023
ELXA SERIES AIR HANDLER UNITS
ELXA series blower−coil units are designed for upow or
horizontal air and indoor applications only. ELXA blower
units are available in six models; 072, 090, 120, 150, 180
and 240. The units match up with ELXC condensing units
and ELXP heat pump units charged with HFC−410A re-
frigerant.
Information and specications contained in this manual
are subject to change. Procedures outlined in this manual
are presented as a recommendation only and do not su-
persede or replace local or state codes.
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.
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Lennox ELXA Series Specifications

General IconGeneral
Product TypeAir Handler
SeriesELXA
Cooling Capacity1.5 to 5 tons
Motor TypeECM
Voltage208/230V
Warranty5-Year Limited Warranty on covered components
Blower MotorECM

Summary

ELXA SERIES AIR HANDLER UNITS

SPECIFICATIONS

General Data

General unit specifications including tonnage and blower type.

Connections

Details refrigerant line sizes, condensate drain, and coil specifications.

Blower and Drive

Specifies blower wheel diameter, width, and filter size.

OPTIONS ACCESSORIES

Blower Motor and Drive Kits

Lists available blower motor and drive kits and their factory installation status.

Cabinet Options

Details optional cabinet features like Corrosion Protection and Float Switch.

Control Systems

Lists available control system options like BACnet modules and sensors.

Electric Heat Options

Lists available electric heat kits by size, voltage, and catalog number.

Economizer Options

Details standard and high-performance economizers and their controls.

Indoor Air Quality

Covers air filters and CO2 sensors for improving indoor air quality.

Refrigerant System Components

Lists specific refrigerant system accessories like check valve kits.

BLOWER DATA

EL072 XA Blower Performance

Provides blower performance data for the EL072XA model at various air volumes and pressures.

EL090 XA Blower Performance

Details blower performance for the EL090XA model across different air volumes and static pressures.

EL120 XA Blower Performance

Presents blower performance data for the EL120XA model for various air volumes and static pressures.

EL150 XA Blower Performance

Lists blower performance data for the EL150XA model at different air volumes and static pressures.

EL180 XA Blower Performance

Details blower performance data for the EL180XA model across various air volumes and static pressures.

EL240 XA Blower Performance

Provides blower performance data for the EL240XA model at different air volumes and static pressures.

BLOWER DRIVE SPECIFICATIONS

BLOWER MOTOR ELECTRICAL DATA

ACCESSORY AIR RESISTANCE

EL072-090 XA Accessory Air Resistance

Lists total resistance for accessories for EL072-090XA models at various air volumes.

EL120-150 XA Accessory Air Resistance

Details total resistance for accessories for EL120-150XA models at various air volumes.

EL180-240 XA Accessory Air Resistance

Provides total resistance for accessories for EL180-240XA models at various air volumes.

OPTIONAL ELECTRIC HEAT DATA - EL072 XA

OPTIONAL ELECTRIC HEAT DATA - EL090 XA

OPTIONAL ELECTRIC HEAT DATA - EL120 XA

OPTIONAL ELECTRIC HEAT DATA - EL150 XA

OPTIONAL ELECTRIC HEAT DATA - EL180 XA

OPTIONAL ELECTRIC HEAT DATA - EL240 XA

UNIT COMPONENTS

Variable Frequency Drive (VFD)

Explains the VFD's role in controlling blower speed based on demand.

Economizer Relay

Describes the function of the economizer relay K43 in controlling the economizer.

Blower Motor

Refers to specifications for blower motor B3 and its drive.

Terminal Blocks

Details terminal blocks TB1 and TB13 for field wiring and VFD connections.

Condensate Pan and Overflow Protection

Explains the condensate overflow prevention system using relay K220 and switch S149.

Freezestats

Describes the function of freezestats S49 and S50 in preventing evaporator coil icing.

Inverter Protection Relay

Explains the role of relay K232 in protecting the inverter and blower operation.

VFD Control Board

Details the VFD control board A183 and its connection to the thermostat for blower speeds.

REFRIGERATION SYSTEM

BLOWER SPEED & BELT TENSION

Air Volume Adjustment

Step-by-step guide for adjusting air volume via the blower pulley system.

ELECTRIC HEAT COMPONENTS

Heating Elements

Explains the composition and operation of electric heating elements.

Contactors

Describes contactors K15 and K16 for energizing heating elements.

Electric Heat Sequencer Relays

Explains the function of sequencer relays K32 in controlling heat stages.

Relays K9 and K19

Details the role of relays K9 and K19 in electrically isolating 24V components.

Fuses F3 and F4

Describes the purpose of fuses F3 and F4 for protecting heating elements and the blower.

Transformer T2

Explains the function of transformer T2 in providing 24VAC power.

High Temperature Limits

Details primary (S15) and secondary (S20) high temperature limits for safety.

Supply Air Inverter Startup

General Inverter Operation

Explains how the inverter controls blower speed for energy efficiency.

Set Maximum Blower CFM

Guides on setting the blower pulley for maximum CFM delivery.

Set Blower Speed for Ventilation

Describes how to set the blower to low speed for ventilation to save energy.

Set Damper Minimum Position

Details setting minimum damper positions for occupied mode with economizers.

Troubleshoot LVC2 Board

Provides steps for troubleshooting the LVC2 VFD control board.

LVC2 Board Terminal Designations

Identifies terminal designations on the LVC2 board for VFD inputs and thermostat connections.

Verify Proper Operation

Provides instructions for verifying proper blower operation and VFD output.

Sequence of Operation

Blower Cooling Sequence

Details the blower operation sequence for cooling modes, including stage changes.

Blower Heating Sequence

Describes the blower operation sequence for heating modes.

ELECTRIC HEAT SEQUENCE OF OPERATION

1-Stage Heat Operation

Explains the sequence for 1-stage electric heat operation, including control relays.

2-Stage Heat Operation

Details the sequence for 2-stage electric heat for both AC and heat pump units.

2-Stage Heat Operation (50 kW)

Describes the 2-stage electric heat sequence for 50kW units in Y volt configuration.

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