Lennox MLB036S4S User Manual

1
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.

Lennox MLB036S4S Specifications

General

Brand	Lennox
Model	MLB036S4S
Category	Air Conditioner
Language	English

Summary

M22A and M33C Cassette Non-Ducted Indoor Units

1.2. M22A Indoor Unit Specifications

Provides technical specifications for M22A cassette indoor units.

1.3. M33C Indoor Unit Specifications

Provides technical specifications for M33C cassette indoor units.

1.8. M22A and M33C Condensate Drain Test Procedure

Outlines the procedure for testing condensate drainage on M22A/M33C units.

MMDB Ducted Indoor Units

2.2. MMDB Indoor Unit Specifications

Provides technical specifications for MMDB ducted indoor units.

2.3. Indoor Unit Blower Data

Presents blower performance data (air volume vs. static pressure) for MMDB units.

2.7. MMDB Condensate Drain Test Procedure

Outlines the procedure for testing condensate drainage on MMDB units.

MWMC and 3WMC-036 Wall Mounted Indoor Units

3.2. Indoor Unit Specifications (009 - 012 Ton) Units

Provides specifications for MWMC units (009-012 Ton).

3.3. Indoor Unit Specifications (018 - 030 Ton) Units

Provides specifications for MWMC units (018-030 Ton).

3.4. Indoor Unit Specifications (3WMC)

Provides specifications for 3WMC units.

3.8. Dry Mode Operation - MWMC and 3WMC

Explains the procedure and sequence for dry mode operation.

3.9. Test Run - MWMC and 3WMC

Outlines the procedure for performing a test run on MWMC/3WMC units.

MCFA and MCFB Ceiling / Floor Indoor Units

4.2. Indoor Unit Specifications (018 - 048 Ton) Units

Provides specifications for MCFA/MCFB units (018-048 Ton).

MFMA Floor Indoor Unit

5.2. Indoor Unit Specifications (012 Ton) Unit

Provides specifications for the MFMA012S4 unit.

Indoor and Outdoor Power and Communication Wiring Requirements

6.1. Overview

Provides a general overview of wiring requirements for indoor and outdoor units.

6.2. Wiring Guide

Details wiring specifications for single-zone and multi-zone systems.

6.3. Terminal Connections

Illustrates terminal connection diagrams for single and multi-zone systems.

Connection to Centralized Controller, ON/OFF and Alarm Devices

8.1. Set Indoor Unit Address for Centralized Control (Used with VRF Only)

Explains how to set unique addresses for units connected to a centralized controller.

8.2. Centralized Controller

Describes connecting units to centralized controllers via XYE terminals.

8.5. Connecting Cables

Specifies wire gauges for power cord connections based on unit drive types.

Single and Multiple Zone Outdoor Units

9.2. MPC Single-Zone Specifications (0.75 - 1.5 Ton)

Provides technical specifications for MPC single-zone units (0.75-1.5 Ton).

9.3. MPC Single-Zone Specifications (2 - 4 Ton)

9.4. 3PC Single-Zone Specifications

9.5. MLB Single-Zone Specifications (0.75 - 2 Ton)

9.6. MLB Single-Zone Specifications (3 - 4 Ton)

9.7. MPC Multi-Zone Specifications (1.5 - 2.5 Ton)

9.8. MPC Multi-Zone Specifications (3 - 4 Ton)

9.9. MLB Multi-Zone Specifications (1.5 - 3 Ton)

9.10. MLB Multi-Zone Specifications (4 Ton)

Indoor / Outdoor Unit Combinations

10.1. MPC Multi-Zone System Combinations

Lists valid indoor/outdoor unit combinations for MPC multi-zone systems.

10.2. MLB Multi-Zone System Combinations

Lists valid indoor/outdoor unit combinations for MLB multi-zone systems.

Refrigeration Pipe Work

11.1. MPC and 3PC Single-Zone Refrigerant Cycle Diagram

11.2. MPC Two-Zone Refrigerant Cycle Diagram

11.3. MPC Three-Zone Refrigerant Cycle Diagram

11.4. MPC Four-Zone Refrigerant Cycle Diagram

11.5. MPC Five-Zone Refrigerant Cycle Diagram

11.6. MLB Six-Zone Refrigerant Cycle Diagram

11.7. Single-Zone Piping Limitations

Details maximum and minimum line set lengths and elevation limits.

11.8. Multi-Zone Piping Limitations

Details piping limitations for multi-zone systems.

MPC Multi-Zone Outdoor Unit Connections and Line Set Usage

13.1. MPC018S4M Connections

13.2. MPC024S4M Connections

13.3. MPC030S4M Connections

13.4. MPC036S4M Connections

13.5. MPC048S4M Connections

MLB Multi-Zone Outdoor Unit Connections and Line Set Usage

14.1. MLB018S4M Connections

14.2. MLB030S4M Connections

14.3. MLB036S4M Connections

14.4. MLB048S4M Connections

Power and Communication Wiring for Systems

Installation Requirements

18.1. Torque Requirements

18.2. Pipe Length and Elevation

18.2.1. Additional Refrigerant Charge

Explains how to calculate and add refrigerant based on pipe length.

18.2.2. Gas Leak Check with Soap Water

18.2.4. Air Purging using a Vacuum Pump

18.2.5. Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length

Details adding refrigerant for longer pipe runs.

18.2.6. Add Refrigerant after Long-Term System Operation

18.2.8. Evacuation after Servicing the Outdoor Unit Refrigeration Circuit

Start-Up

20.1. Adding Refrigerant - Single-Zone Systems

Explains adding refrigerant for single-zone systems based on pipe length.

20.2. Adding Refrigerant - Multi-Zone Systems

Explains adding refrigerant for multi-zone systems based on pipe length.

Specifications and Operations

23.1. Main Protection

23.2. Indoor/Outdoor Units Communication Protection

23.3. Compressor Preheating Functions

23.4. Compressor Crankcase Heater

Pressure on Service Port

24.1. Cooling Charts

Provides cooling charge pressure charts based on indoor/outdoor temperatures.

24.2. Heating Chart

Provides heating charge pressure charts based on indoor/outdoor temperatures.

24.3. Capacity Request Calculations

24.4. Defrost Control

Explains the conditions and calculations for initiating defrost mode.

24.5. Defrost Theory

24.6. Defrost Termination

24.7. Outdoor Fan Control

24.8. Four-Way Valve Control

24.9. Electronic Expansion Valve (EXV) Control

Explains the control logic for electronic expansion valves in cooling and heating.