Lennox MMA018SM4 Service Manual page 2

Outdoor Unit Information ...................................... 30
6. Single and Multi-Zone Outdoor Units ...................................... 30
6.1. Model Number Identification ......................................................30
6.2. Outdoor Unit Specifications .......................................................32
6.3. Single-Zone Outdoor Unit Dimensions ......................................39
6.4. Multi-Zone Outdoor Unit Dimensions ........................................40
6.5. Outdoor Unit Clearances - Single Units .....................................41
6.6. Outdoor Unit Clearances - Multiple Units ..................................42
7. MLB and MPC Multi-Zone System Combinations .................. 43
8. Refrigeration Pipe Work ........................................................... 49
8.1. MPC Single-Zone Refrigerant Cycle Diagram ...........................49
8.2. MPC Two-Zone Refrigerant Cycle Diagram ..............................49
8.3. MPC Three-Zone Refrigerant Cycle Diagram............................50
8.4. MPC Four-Zone Refrigerant Cycle Diagram .............................50
8.5. MPC Five-Zone Refrigerant Cycle Diagram ..............................51
8.6. Single-Zone Piping Limitations ..................................................52
8.7. Multi-Zone Piping Limitations ....................................................52
9. Master Valves (3 to 5 Zone Outdoor Units) ............................. 54
10. MLB and MPC Multi-Zone Outdoor Unit Connections and Line
Set Usage ................................................................................... 54
11. Power and Communication Wiring for Systems ................... 62
12. Outdoor Unit Condensate Piping ............................................ 63
13. MPC Condensate Pump Diagrams .......................................... 64
14. Installation Requirements ........................................................ 65
14.1. Torque Requirements ................................................................65
14.2. Pipe Length and Elevation .........................................................65
15. Electronic Function................................................................... 69
15.1. Abbreviations .............................................................................69
15.2. Electric Control Working Environment. ......................................70
16. Start-Up ...................................................................................... 70
16.1. Adding Refrigerant - Single-Zone Systems ...............................70
16.2. Adding Refrigerant - Multi-Zone Systems ..................................70
17. Single and Multi-Zone Outdoor Control Connections ........... 71
18. Specifications and Operations ................................................ 76
19. Pressure on Service Port ......................................................... 77
19.1. Cooling Charts ...........................................................................77
19.2. Heating Chart ............................................................................77
19.3. Capacity Request Calculations ..................................................78
19.4. Heating Mode ............................................................................79
19.5. Defrost Control ..........................................................................81
19.6. Defrost Theory ...........................................................................81
19.7. Defrost Termination....................................................................81
19.8. Outdoor Fan Control ..................................................................82
19.9. Four-Way Valve Control .............................................................83
19.10. Electronic Expansion Valve (EXV) Control ................................83
20. Error Codes .............................................................................. 84
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