Lennox MMA018SM4

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Figure 26. Typical Component Locations (MLB048S4S-2P, MLB036S4S-2P, MLB048S4S-1P, MLB036S4S-1P,

MLB048S4M-2P. MPC048S4S-1P and MPC060S4S-1P)

Main Page

Table of Contents1
Safety Precautions3
Refrigerant Presence3
Fire Extinguisher3
No Ignition Sources3
Ventilated Workspace4
Check Refrigeration Equipment4
Check Electrical Devices4
Repair Seal Components4
Repair to Intrinsically Safe Components4
Check Cabling4
Flammable Refrigerant Detection5
Remove/Evacuation of Refrigerant5
Charging Procedures5
Decommissioning6
Labeling6
Recovery6
Indoor Unit Information7
MMA (Mini-Split Multi-Position Air Handler)7
Model Number Identification7
Indoor Unit Specifications7
MMA Indoor Unit Dimensions9
MMA Indoor Unit Clearances10
Indoor Unit Blower Data11
Noise Criterion Curves15
Indoor and Outdoor Power and Communication Wiring Requirements17
Overview17
Indoor/Outdoor Unit Match-Ups18
Controller Compatibility18
Electrical Wiring Diagrams19
Wiring Guide20
Terminal Connections22
Connection to Centralized Controller, ON/OFF and Alarm Devices24
Centralized Controller24
ON/OFF Devices24
Alarm Devices25
Micro-Switch Introduce25
Dial Codes26
Connecting Cables29
Outdoor Unit Information30
Single and Multi-Zone Outdoor Units30
Model Number Identification30
Outdoor Unit Specifications32
Single-Zone Outdoor Unit Dimensions39
Multi-Zone Outdoor Unit Dimensions40
Outdoor Unit Clearances - Single Units41
Outdoor Unit Clearances - Multiple Units42
MLB and MPC Multi-Zone System Combinations43
Refrigeration Pipe Work49
MPC Single-Zone Refrigerant Cycle Diagram49
MPC Two-Zone Refrigerant Cycle Diagram49
MPC Three-Zone Refrigerant Cycle Diagram50
MPC Four-Zone Refrigerant Cycle Diagram50
MPC Five-Zone Refrigerant Cycle Diagram51
Single-Zone Piping Limitations52
Multi-Zone Piping Limitations52
Master Valves (3 to 5 Zone Outdoor Units)54
MLB and MPC Multi-Zone Outdoor Unit Connections and Line Set Usage54
Power and Communication Wiring for Systems62
Outdoor Unit Condensate Piping63
MPC Condensate Pump Diagrams64
Installation Requirements65
Torque Requirements65
Pipe Length and Elevation65
Electronic Function69
Abbreviations69
Electric Control Working Environment70
Start-Up70
Adding Refrigerant - Single-Zone Systems70
Adding Refrigerant - Multi-Zone Systems70
Single and Multi-Zone Outdoor Control Connections71
Specifications And Operations76
Pressure on Service Port77
Cooling Charts77
Heating Chart77
Capacity Request Calculations78
Heating Mode79
Defrost Control81
Defrost Theory81
Defrost Termination81
Outdoor Fan Control82
Four-Way Valve Control83
Electronic Expansion Valve (EXV) Control83
Error Codes84

Lennox MMA018SM4

Table of Contents

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