Lennox MHA024S4S-1P User Manual

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
MHA Series Unit Information
CORP1913-L8
11/2020
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 ............................................. 4
1.5. IndoorUnitWallMounts ...........................................5
1.6. Indoor/OutdoorMatches ........................................... 5
2. Air Throw Data ...........................................6
3. Power and Communication Wiring for
Systems .....................................................7
3.1. Overview ...................................................................7
3.2. WireGauge...............................................................7
3.3. TerminalConnections ...............................................8
4. Indoor Unit Diagrams ................................8
5. Wireless Remote ........................................ 9
5.1. Requirements ...........................................................9
5.2. RemoteControlSpecications .................................9
6. Connection to Centralized Controller .... 11
6.1. SetIndoorUnitAddressforCentralizedControl(Used
withVRFOnly) ........................................................ 11
6.2. IndoorUnitConnectionPointsforCentralized
Controller ................................................................12
6.3. DryModeOperation-IndoorUnits .........................12
6.3.1. Procedure .................................................12
6.3.2. DryModeOperationSequence ................13
6.4. TestRun-IndoorUnits ........................................... 13
6.4.1. TestRunInstructions ................................13
6.4.2. BeforeTestRun ........................................13
6.5. Double-CheckPipeConnections ............................13
6.6. AmbientTemperatureisBelow63°F(17°C) ........... 13
7. Single Zone Outdoor Units .....................15
7.1. ModelNumberIdentication ................................... 15
7.2. Specications..........................................................15
7.3. CoolingandHeatingCapacities .............................16
7.3.1. Cooling-009(115V) ................................16
7.3.2. Heating-009(115V) ................................17
7.3.3. Cooling-009(208/230V) .........................17
7.3.4. Heating-009(208/230V) ......................... 18
7.3.5. Cooling-012(115V) ................................18
7.3.6. Heating-012(115V) ................................19
7.3.7. Cooling-012(208/230V) .........................19
7.3.8. Heating-012(208/230V) ......................... 20
7.3.9. Cooling-018(208/230V) .........................20
7.3.10. Heating-018(208/230V) ......................... 21
7.3.11. Cooling-024(208/230V) .........................21
7.3.12. Heating-024(208/230V) ......................... 22
MHA Single Zone Air
Conditioning Outdoor Unit
MWHA Wall Mount Single Zone
Air Conditioning Indoor Unit
Please refer to Corp1914-L8 for indoor and outdoor unit error codes and component diagnostics.

Lennox MHA024S4S-1P Specifications

General

Brand	Lennox
Model	MHA024S4S-1P
Category	Air Conditioner
Language	English

Summary

Indoor Unit Installation and Specifications

1.2. Unit Specifications, Dimensions, and Clearances

Power and Communication Wiring

3.1. Wiring Overview and Safety

General wiring information, safety precautions, and electrical requirements.

3.2. Wire Gauge and Terminal Connections

Centralized Controller Connectivity

6.3. Test Run and Low Ambient Testing

Single Zone Outdoor Unit Information

7.1. Model Identification and Specifications

7.2. Capacities, Dimensions, and Clearances

Refrigeration Piping Guidelines

8.1. Refrigerant Cycle and Piping Limitations

Outdoor Unit Connections and Piping Usage

Power and Communication Wiring

Installation Requirements and Service Procedures

12.1. Leak Checks and Air Purging

Methods for gas leak checks and air/moisture purging with a vacuum pump.

12.2. Refrigerant Management

Procedures for adding refrigerant, including adjustments for pipe length and long-term operation.

12.3. Evacuation and Refrigerant Charging

Steps for evacuating and charging the refrigeration circuit after servicing.

Adding Refrigerant - Single-Zone Systems

Specifications and Operational Data

Unit Disassembly and Component Removal

17.1. Indoor Unit Disassembly Procedures

Detailed steps for disassembling various components of the indoor unit.

17.2. Outdoor Unit Disassembly Procedures

Detailed steps for disassembling various components of the outdoor unit.