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Lennox FLEXY II Series User Manual

Lennox FLEXY II Series
110 pages
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Providing indoor climate comfort
FLEXY II
FLEXYII-IOM-1007-E
Installation, operating
and maintenance

Table of Contents

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Lennox FLEXY II Series Specifications

General IconGeneral
Product TypeAir Conditioner
SeriesFLEXY II Series
RefrigerantR-410A
Sound LevelAs low as 72 dB
Voltage208/230V
StagesMulti-Stage

Summary

TRANSPORT AND HANDLING

MANDATORY HANDLING DEVICES

Guidelines and devices for safe unit transport and movement.

LIFTING THE UNIT

Procedures and requirements for safely lifting the unit using appropriate equipment.

INSTALLATION

FORKLIFT PROTECTIONS

Instructions for removing forklift protections before unit installation.

PRELIMINARY INSTALLATION CHECKS

Essential checks before installing the unit to ensure proper setup.

INSTALLATION REQUIREMENTS

Site preparation and clearance requirements for unit installation.

CONNECTIONS

Ensuring pipework and conduits are secured, sealed, and insulated.

MINIMUM CLEARANCES

Required clearances around the unit for service and airflow.

ROOF MOUNTING FRAME INSTALLATION

CAUTION AND RECOMMENDATIONS

Safety warnings and recommendations for roof frame installation.

CURBING AND FLASHING

Instructions for insulating, counter-flashing, and sealing roof curbs.

DUCT CONNECTIONS

Recommendations for proper duct connections to the unit.

NON-ADJUSTABLE ROOF CURB INSTALLATION

Procedures for installing non-adjustable roof curbs.

ADJUSTABLE ROOFCURB

Details and specifications for adjustable roof curb installations.

MULTIDIRECTIONAL ROOFCURB

Installation details for multidirectional roof curb types.

RETURN ROOFCURB

Specifics for installing return roof curb configurations.

RETURN HORIZONTAL ROOFCURB

Installation guidance for horizontal return roof curb setups.

TRANSITION CURB

Information on installing transition curb components.

ENERGY RECOVERY SYSTEM

ECONOMISER AND EXTRACTION

Operation and function of the economiser and extraction systems.

COMMISSIONING PROCEDURE

SAFETY AND PREPARATION NOTES

Critical safety warnings and preparation steps before commissioning.

ELECTRICAL CONNECTIONS

Ensuring correct power supply and wiring connections.

POWER SUPPLY REQUIREMENTS

Verifying the power supply includes the correct phase configuration.

PRELIMINARY CHECKS

Verifying drive motors, pulleys, and electrical safety devices.

UNIT START-UP

Step-by-step guide for starting up the unit.

POWERING THE UNIT

Procedures for powering up the unit and checking fan rotation.

RUN TEST PROCEDURES

Performing tests like reverse cycle and safety checks.

VENTILATION SYSTEM

BELT TENSION ADJUSTMENT

How to check and adjust drive belt tension for optimal performance.

PULLEY MOUNTING AND ADJUSTMENT

Procedures for removing, installing, and aligning pulleys.

AIRFLOW BALANCING

Methods for achieving correct airflow and pressure balance.

SITE TEST AND MAINTENANCE

Measuring motor power and adjusting fan speed for site conditions.

ADJUSTMENT METHODS

Techniques for adjusting pulleys and checking airflow/ESP.

FILTER MANAGEMENT

Filter replacement procedures and fault identification.

AIRSOCK CONTROL

Operation and start-up sequence for air sock distribution.

UV LIGHT SYSTEM

Information on the UV light option for bacteria control and safety.

HEATING SYSTEM

HOT WATER COIL

Installation, connections, and freeze protection for hot water coils.

HYDRAULIC CONNECTIONS

Details on connecting the 3-way valve and system filling.

FREEZE PROTECTION

Methods for preventing coil freezing using glycol or draining.

ELECTRIC HEATER

Information on electric heater types, sizes, and capacities.

GENERAL INFORMATION

Overview of electric heater construction and features.

GAS BURNER

Installation, checks, and operation of gas burners.

PRELIMINARY CHECKS

Essential checks before starting the gas burner system.

GAS BURNER SPECIFIC MODELS

Details on gas burner types and their specific installation requirements.

PRESSURE ADJUSTMENTS

Pressure adjustments for gas burner models.

BURNER SAFETY AND OPERATION

Safety checks, fire-up sequence, and operation procedures for gas burners.

GAS BURNER FIRE-UP SEQUENCE

Flowchart detailing the gas burner start-up sequence.

GAS BURNER TROUBLESHOOTING

Common faults and solutions for gas burner operation.

DISASSEMBLING THE GAS BURNER

Procedures for safely disassembling the gas burner for maintenance.

MODULATING GAS BURNER

Operation and adjustment of modulating gas burners.

MODULATING GAS OPERATIONS

Procedures for starting up and adjusting modulating gas burners.

ELECTRICAL DATA AND DIAGRAMS

WIRING DIAGRAMS

Diagrams illustrating electrical connections and components.

DIAGRAM REFERENCE LEGEND

Key to symbols and references used in wiring diagrams.

MAIN CURRENT DIAGRAM

Overall wiring diagram for main power supply and components.

CLIMATIC 50 CONTROLLER

Wiring diagram for the Climatic 50 control unit.

CLIMATIC 50 INPUT/OUTPUT

Diagrams for Climatic 50 controller inputs and outputs.

DAD SMOKE DETECTOR

Wiring diagram for the DAD smoke detector system.

GENERAL CUSTOMER CONNECTION

Diagrams for general customer connections (TCB/ADC).

GAS BURNER WIRING DIAGRAMS

Specific wiring diagrams for gas burner configurations.

ELECTRIC HEATER WIRING DIAGRAM

Wiring diagram for electric heater installations.

CONTROL VARIABLES

Configuration options for logical and analogue input/output boards.

REFRIGERANT INFORMATION

REFRIGERANT DEFINITION

Characteristics and definition of R-410A refrigerant.

COMPRESSOR PROTECTION

ADVANCED SCROLL TEMPERATURE PROTECTION (ASTP)

Explanation of ASTP protection and its behavior.

REFRIGERATION PRINCIPLE SKETCHES

PRINCIPLE SKETCHES

Schematic diagrams of refrigeration circuits for different unit types.

HOT WATER COIL DIAGRAM

MAINTENANCE DIAGNOSTIC

REFRIGERATION SYSTEM FAULTS

Troubleshooting guide for refrigeration circuit issues.

FAN AND BLOWER PROBLEMS

Common issues and solutions for indoor and outdoor fans.

HEATING SYSTEM FAULTS

Troubleshooting guide for electric heater and water leaks.

CONTROL SYSTEM FAULTS

Diagnosing issues with the DC50/DS50 control systems.

MAINTENANCE PLAN

WARRANTY INFORMATION

WARRANTY TERMS AND CONDITIONS

General warranty terms, anti-corrosion warranty, and maintenance contract requirements.

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