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Lennox MCA024S4S-1P User Manual

Lennox MCA024S4S-1P
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1
MINI-SPLIT SYSTEMS SERVICE MANUAL
MCA Series Unit Information
CORP1907-L5
11/2020
Supersedes 8/2019
Table of Contents
1. Indoor Units ................................................3
1.1. ModelNumberIdentication ................................... 3
1.2. IndoorUnitSpecications ....................................... 3
1.3. Indoor Unit Dimensions .......................................... 4
1.4. IndoorUnitClearances ........................................... 5
1.5. IndoorUnitWallMounts ......................................... 5
2. Indoor/Outdoor Matches ...........................6
3. Air Throw Data ...........................................6
4. Power and Communication Wiring for
Systems .....................................................7
4.1. Overview ................................................................. 7
4.2. WireGauge............................................................. 7
4.3. TerminalConnections ............................................. 8
5. Indoor Unit Diagrams ................................8
6. Wireless Remote ...................................... 10
6.1. Requirements ....................................................... 10
6.2. RemoteControlSpecications ............................. 10
6.3. FunctionButtons ................................................... 11
6.4. Display .................................................................. 12
6.5. Operations ............................................................ 12
6.5.1. Start/StopOperation.............................. 12
6.5.2. Select Fahrenheit or Celsius ............... 12
6.5.3. Cool/Fan mode ..................................... 12
6.5.4. DryMode ................................................ 12
6.5.5. TimerOperation ..................................... 12
6.5.6. TimerONOperation ............................... 12
6.5.7. TimerOFFOperation ............................. 13
6.5.8. ModifyTimerON/OFFsettings ............... 13
7. Connection to Centralized Controller ....13
7.1. SetIndoorUnitAddressforCentralizedControl
(UsedwithVRFOnly) ........................................... 13
7.2. IndoorUnitConnectionPointsforCentralized
Controller .............................................................. 14
7.3. DryModeOperation-IndoorUnits ....................... 14
7.3.1. Procedure ............................................... 14
7.3.2. DryModeOperationSequence .............. 14
7.4. TestRun-IndoorUnits ......................................... 14
7.4.1. TestRunInstructions .............................. 14
7.4.2. BeforeTestRun ...................................... 14
7.5. Double-CheckPipeConnections .......................... 15
7.6. AmbientTemperatureisBelow63°F(17°C) ......... 15
8. Single Zone Outdoor Units .....................16
8.1. ModelNumberIdentication ................................. 16
8.2. Specications........................................................ 16
8.3. CoolingCapacity................................................... 17
8.3.1. -009(208/230V) .................................... 17
8.3.2. -012(115V) ............................................ 18
8.3.3. -012(208/230V) .................................... 18
MCA Single Zone Air
Conditioning Outdoor Unit
MCWA Wall Mount Single Zone
Air Conditioning Indoor Unit
Please refer to Corp1908-L5 for indoor and outdoor unit error codes and component diagnostics.

Table of Contents

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Lennox MCA024S4S-1P Specifications

General IconGeneral
RefrigerantR-410A
Voltage208/230V
Phase1
Compressor TypeScroll
EERUp to 11.5
Cooling Capacity24000 BTU/h
HSPFNot Available

Summary

Indoor Units

Model Number Identification

Explanation of the model number nomenclature for indoor units.

Indoor Unit Specifications

Technical specifications for various indoor unit models.

Indoor Unit Dimensions

Provides dimensional drawings and measurements for indoor units.

Indoor Unit Clearances

Specifies required clearances for indoor unit installation.

Indoor Unit Wall Mounts

Details on wall plate dimensions and mounting for indoor units.

Indoor/Outdoor Matches

Air Throw Data

Power and Communication Wiring for Systems

Overview

General overview of power and communication wiring requirements.

Wire Gauge

Specifies the recommended wire gauge and requirements for system wiring.

Terminal Connections

Illustrates terminal connections for indoor and outdoor units in single-zone wiring.

Indoor Unit Diagrams

Wireless Remote

Requirements

Conditions and guidelines for using the wireless remote controller effectively.

Remote Control Specifications

Technical specifications for the wireless remote control unit.

Function Buttons

Detailed explanation of the functions of each button on the remote controller.

Display

Explanation of the icons and information displayed on the remote controller.

Operations

Instructions for operating the indoor unit using the remote controller.

Connection to Centralized Controller

Set Indoor Unit Address for Centralized Control

Guide to setting unique addresses for indoor units connected to a centralized controller.

Indoor Unit Connection Points for Centralized Controller

Details on terminal connections for centralized controller integration.

Dry Mode Operation - Indoor Units

Instructions for operating the unit in dry mode and its sequence.

Test Run - Indoor Units

Steps and checks required to perform a test run on indoor units.

Double-Check Pipe Connections

Instructions to re-check refrigerant pipe connections after operation begins.

Ambient Temperature is Below 63°F (17°C)

Procedure for testing cooling function when ambient temperature is low.

Single Zone Outdoor Units

Model Number Identification

Explanation of the model number nomenclature for outdoor units.

Specifications

Detailed specifications for single-zone outdoor unit models.

Cooling Capacity

Cooling capacity data for various outdoor unit models at different temperatures.

Outdoor Unit Dimensions

Dimensional drawings for 09, 12, 18K and 24K outdoor units.

Outdoor Unit Clearances

Specifies required clearances for single and multiple outdoor unit installations.

Refrigeration Pipe Work

Single-Zone Refrigerant Cycle Diagram

Schematic of the single-zone refrigerant cycle.

Single-Zone Piping Limitations

Details on maximum line set lengths and elevation differences for single-zone systems.

Outdoor Unit Connections and Line Set Usage

Pipe Length

Maximum piping length and height difference specifications.

Torque Requirements

Specifies torque requirements for refrigerant pipe connections.

Power and Communication Wiring for Systems

Outdoor Unit Diagrams

Installation Requirements

Gas Leak Check with Soap Water

Procedure for checking gas leaks using soap water.

Air and Moisture

Discusses problems caused by air and moisture in the refrigerant system.

Air Purging using a Vacuum Pump

Detailed steps for air purging the system using a vacuum pump.

Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length

Guidance on adding refrigerant for extended pipe lengths.

Add Refrigerant after Long-Term System Operation

Procedure for adding refrigerant after the system has been in operation.

Servicing Indoor Unit Refrigeration Circuit

Steps for servicing the indoor unit's refrigeration circuit, including refrigerant recovery.

Evacuation after Servicing the Outdoor Unit Refrigeration Circuit

Procedures for evacuating the refrigeration circuit after outdoor unit servicing.

Electronic Function

Abbreviation

List of abbreviations used for electronic functions.

Electric Control Working Environment.

Details on the working environment for electrical controls.

Adding Refrigerant - Single-Zone Systems

Single-Zone Outdoor Unit LED Locations

Specifications and Operations

Cooling Chart

Provides cooling capacity data in Fahrenheit and Celsius based on indoor/outdoor temperatures.

Capacity Request Calculations

Formulas and guidelines for calculating total capacity requests.

Outdoor Fan Control

Details on how the outdoor fan speed is controlled based on ambient temperature.

Indoor and Outdoor Unit Disassembly

Indoor Unit (All Models)

Procedures for disassembling the indoor unit, including its front panel and filters.

Outdoor Unit

Procedures for disassembling the outdoor unit, including panel removal.

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