Lennox MMA024SM4 - User Manual

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
Indoor and Outdoor Unit Information
100090
5/2023
1. Safety Precautions ........................................................................ . 3
1.1. Refrigerant Presence ...................................................................3
1.2. Fire Extinguisher ..........................................................................3
1.3. No Ignition Sources .....................................................................3
1.4. Ventilated Workspace ..................................................................4
1.5. Check Refrigeration Equipment ...................................................4
1.6. Check Electrical Devices .............................................................4
1.7. Repair Seal Components ............................................................4
1.8. Repair to Intrinsically Safe Components .....................................4
1.9. Check Cabling .............................................................................4
1.10. Flammable Refrigerant Detection ................................................5
1.11. Remove/Evacuation of Refrigerant ..............................................5
1.12. Charging Procedures ...................................................................5
1.13. Decommissioning .......................................................................6
1.14. Labeling ......................................................................................6
1.15. Recovery .....................................................................................6
Indoor Unit Information .......................................... 7
2. MMA (Mini-Split Multi-Position Air Handler) ............................. 7
2.1. ModelNumberIdentication ........................................................7
2.2. IndoorUnitSpecications ............................................................7
2.4. MMA Indoor Unit Dimensions ......................................................9
2.5. MMA Indoor Unit Clearances .....................................................10
2.6. Indoor Unit Blower Data ............................................................11
3. Noise Criterion Curves ............................................................. 15
3.1. Indoor and Outdoor Power and Communication Wiring
Requirements ...........................................................................17
3.2. Overview ....................................................................................17
3.3. Indoor/Outdoor Unit Match-Ups .................................................18
3.4. Controller Compatibility .............................................................18
3.5. Electrical Wiring Diagrams ........................................................19
3.6. Wiring Guide ..............................................................................20
3.7. Terminal Connections ................................................................22
4. Connection to Centralized Controller, ON/OFF and Alarm De-
vices .......................................................................................... 24
4.1. Centralized Controller ................................................................24
4.2. ON/OFF Devices .......................................................................24
4.3. Alarm Devices ...........................................................................25
4.4. Micro-Switch Introduce ..............................................................25
4.5. Dial Codes .................................................................................26
5. Connecting Cables....................................................................29
Mini-Split Multi-Position Indoor Air Handler (MMA)
MLB & MPC Outdoor Units
Table of Contents

Summary

Mini-Split Systems Service Manual

Safety Precautions

Covers essential safety measures for handling refrigerants, electrical hazards, and general workspace safety.

Indoor Unit Information

Details specifications, dimensions, blower data, and noise levels for MMA indoor units.

Noise Criterion Curves

Presents noise level data for various MMA indoor units across different frequencies.

Outdoor Unit Information

Covers specifications, dimensions, clearances, and system combinations for outdoor units.

MLB and MPC Multi-Zone System Combinations

Details compatible combinations of indoor and outdoor units for multi-zone systems.

Refrigeration and Piping

Explains refrigerant cycles, piping limitations, line set elevations, and master valve connections.

Wiring and Installation

Covers power/communication wiring, terminal connections, cable selection, and installation requirements.

System Operations and Controls

Explains electronic functions, protection, defrost, fan control, EXV, and system operations.

Error Codes

Lists and explains various error codes and their corresponding malfunctions or protections.

Lennox MMA024SM4 Specifications

General

Compressor Type	Scroll
Refrigerant Type	R-410A
Voltage	208/230V
Phase	1
Sound Level (Outdoor Unit)	72 dB
Cooling Capacity	24000 BTU/h