Lennox M33C024S4 - User Manual

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MINI-SPLIT SYSTEMS SERVICE MANUAL

Indoor and Outdoor Unit Information

100029

5/2022

Table of Contents

Indoor Unit Information ...................................3

1. M22A and M33C Cassette Non-Ducted Indoor Units ............... 3

1.1. ModelNumberIdentication ........................................................3

1.2. M22AIndoorUnitSpecications ..................................................3

1.3. M33CIndoorUnitSpecications .................................................4

1.4. M22AIndoorUnitDimensions .....................................................5

1.5. M33CIndoorUnitDimensions .....................................................6

1.6. M22AandM33CIndoorUnitClearances ....................................7

1.7. M22AandM33CIndoorUnitControlBoardSwitches

Location .......................................................................................8

1.8. M22AandM33CCondensateDrainTestProcedure ...................9

2. MMDB Ducted Indoor Units ......................................................10

2.1. MMDBModelNumberIdentication ..........................................10

2.2. MMDBIndoorUnitSpecications .............................................. 11

2.3. IndoorUnitBlowerData ............................................................12

2.4. MMDBIndoorUnitDimensions .................................................18

2.5. MMDBIndoorUnitClearances ..................................................19

2.6. CondensatePumpLift-MMDBandM22A/M33C .....................20

2.7. MMDBCondensateDrainTestProcedure.................................20

2.8. MMDBIndoorUnitGravityDrain ...............................................21

3. MWMC and 3WMC-036 Wall Mounted Indoor Units ............... 22

3.1. ModelNumberIdentication ......................................................22

3.2. IndoorUnitSpecications(009-012Ton)Units ......................23

3.3. IndoorUnitSpecications(018-030Ton)Units .......................23

3.4. IndoorUnitSpecications(3WMC) ...........................................23

3.5. IndoorUnitDimensions(MWMCand3WMC) ...........................24

3.6. IndoorUnitClearances(AllModelsandSizes) .........................25

3.7. MWMCand3WMC036S4UnitControlBoardSwitches

Location .....................................................................................25

3.8. DryModeOperation-MWMCand3WMC ................................26

3.9. TestRun-MWMCand3WMC ..................................................26

3.10. Double-CheckPipeConnections ...............................................26

3.11. AmbientTemperatureisBelow63°F(17°C) .............................27

4. MCFA and MCFB Ceiling / Floor Indoor Units ........................28

4.1. ModelNumberIdentication ......................................................28

4.2. IndoorUnitSpecications(018-048Ton)Units .......................28

4.3. IndoorUnitDimensions .............................................................29

4.4. IndoorUnitClearances ..............................................................30

4.5. MCFAandMCFBIndoorUnitControlBoardSwitches

Location .....................................................................................31

5. MFMA Floor Indoor Unit ...........................................................32

5.1. ModelNumberIdentication ......................................................32

5.2. IndoorUnitSpecications(012Ton)Unit ..................................32

5.3. IndoorUnitDimensions .............................................................33

5.4. IndoorUnitClearances ..............................................................33

6. Indoor and Outdoor Power and Communication

Wiring Requirements ............................................................... 34

6.1. Overview ....................................................................................34

6.2. WiringGuide ..............................................................................35

MCFA and MCFB

M22A and M33C

MMDB

MWMC and 3WMC036

MPC, 3PC, and MLB

Single Zone

MLB and MPC

Multi-Zone

MFMA

Please refer to service manual 100030 for indoor and

outdoor unit error codes and component diagnostics.

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Lennox M33C024S4 Specifications

General

Brand	Lennox
Model	M33C024S4
Category	Air Conditioner
Language	English

Summary

Indoor Unit Information

1. M22 A and M33 C Cassette Non-Ducted Indoor Units

Specifications, dimensions, and clearances for M22A and M33C cassette units.

2. MMDB Ducted Indoor Units

Specifications, dimensions, and blower data for MMDB ducted units.

3. MWMC and 3 WMC-036 Wall Mounted Indoor Units

Specifications, dimensions, and control board switch locations for MWMC/3WMC units.

4. MCFA and MCFB Ceiling; Floor Indoor Units

Specifications, dimensions, and clearances for MCFA/MCFB ceiling/floor units.

5. MFMA Floor Indoor Unit

Specifications and dimensions for the MFMA floor indoor unit.

6. Indoor and Outdoor Power and Communication Wiring Requirements

Requirements for power and communication wiring for indoor and outdoor units.

Outdoor Unit Information

9. Single and Multiple Zone Outdoor Units

Model identification, specifications, dimensions, and clearances for outdoor units.

10. Indoor; Outdoor Unit Combinations

Tables detailing valid indoor/outdoor unit combinations for MPC and MLB systems.

11. Refrigeration Pipe Work

Refrigerant cycle diagrams and piping limitations for MPC and MLB systems.

12. Master Valves (3 to 5 Zone Outdoor Units)

Information on master valves in multi-zone outdoor units.

13. MPC Multi-Zone Outdoor Unit Connections and Line Set Usage

Connection sizes and line set usage for MPC multi-zone outdoor units.

14. MLB Multi-Zone Outdoor Unit Connections and Line Set Usage

Connection sizes and line set usage for MLB multi-zone outdoor units.

15. Power and Communication Wiring for Systems

General safety and installation guidelines for power and communication wiring.

16. Outdoor Unit Condensate Piping

Requirements for condensate piping for outdoor heat pump units.

17. MPC Condensate Pump Diagrams

Wiring diagrams for MPC condensate pumps.

18. Installation Requirements

Torque requirements, pipe length, elevation, and refrigerant charge details.

19. Electronic Function

Abbreviations and definitions for electronic functions and control parameters.

20. Start-Up

Procedures for adding refrigerant for single-zone and multi-zone systems.

21. Single-Zone Outdoor Unit LED Locations

Location of LEDs on single-zone outdoor units for diagnostic purposes.

22. Multi-Zone Outdoor Unit LEDs and SW1 Locations

Location of LEDs and SW1 on multi-zone outdoor units for diagnostic purposes.

23. Specifications and Operations

Detailed specifications and operational parameters for system functions.

24. Pressure on Service Port

Cooling and heating charts for service port pressure readings.

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