Lennox MLB036S4M - 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 MLB036S4M Specifications

General

Cooling Capacity (BTU)	36, 000
SEER Rating	16
HSPF Rating	9.5
Sound Level (dB)	74
Refrigerant	R-410A
Stages	Single
Voltage	208/230
Phase	1
Sound Level (Outdoor Unit)	76

Summary

M22 A and M33 C Cassette Non-Ducted Indoor Units

M22 A Indoor Unit Specifications

Provides detailed specifications for the M22A indoor unit.

M33 C Indoor Unit Specifications

Provides detailed specifications for the M33C indoor unit.

MMDB Ducted Indoor Units

MMDB Model Number Identification

MMDB Indoor Unit Specifications

Provides detailed specifications for MMDB indoor units.

Indoor Unit Blower Data

MWMC and 3 WMC-036 Wall Mounted Indoor Units

Indoor Unit Specifications (009 - 012 Ton) Units

Provides specifications for MWMC units in the 009-012 ton range.

Indoor Unit Specifications (018 - 030 Ton) Units

Provides specifications for MWMC units in the 018-030 ton range.

MCFA and MCFB Ceiling; Floor Indoor Units

Indoor Unit Specifications (018 - 048 Ton) Units

Provides detailed specifications for MCFA/MCFB units in the 018-048 ton range.

MFMA Floor Indoor Unit

Model Number Identification

Indoor Unit Specifications (012 Ton) Unit

Provides detailed specifications for the MFMA012S4 unit.

Indoor and Outdoor Power and Communication Wiring Requirements

Overview

General guidelines for system wiring, grounding, safety, and compliance with NEC/CEC standards.

Wiring Guide

Tables detailing wire gauge and requirements for single-zone and multi-zone system wiring.

Single and Multiple Zone Outdoor Units

Outdoor Unit Model Number Identification

MPC Single-Zone Specifications

Detailed specifications for MPC single-zone units from 0.75 to 1.5 tons.

MLB Single-Zone Specifications

Detailed specifications for MLB single-zone units from 0.75 to 2 tons.

MPC Multi-Zone Specifications

Detailed specifications for MPC multi-zone units from 1.5 to 2.5 tons.

MLB Multi-Zone Specifications

Detailed specifications for MLB multi-zone units from 1.5 to 3 tons.

Indoor; Outdoor Unit Combinations

MPC Multi-Zone System Combinations

Tables showing compatible indoor unit combinations for MPC multi-zone outdoor units.

MLB Multi-Zone System Combinations

Tables showing compatible indoor unit combinations for MLB multi-zone outdoor units.

Refrigeration Pipe Work

MPC Refrigerant Cycle Diagrams

MLB Refrigerant Cycle Diagram

Piping Limitations

Specifies maximum line set lengths and elevation differences for systems.

MPC Multi-Zone Outdoor Unit Connections and Line Set Usage

MPC018 S4 M Connections and Line Set Usage

MPC024 S4 M Connections and Line Set Usage

MPC030 S4 M Connections and Line Set Usage

MPC036 S4 M Connections and Line Set Usage

MPC048 S4 M Connections and Line Set Usage

MLB Multi-Zone Outdoor Unit Connections and Line Set Usage

MLB018 S4 M Connections and Line Set Usage

MLB030 S4 M Connections and Line Set Usage

MLB036 S4 M Connections and Line Set Usage

MLB048 S4 M Connections and Line Set Usage

Power and Communication Wiring for Systems

Installation Requirements

Torque Requirements and Pipe Length;Elevation

Specifies torque values for connections and maximum piping lengths/elevation.

Refrigerant Handling Procedures

Specifications and Operations

Unit Protection Mechanisms

Pressure on Service Port

Cooling Pressure Charts and Graphs

Provides cooling charge data (pressure) based on indoor and outdoor temperatures.

Heating Pressure Charts and Graphs

Provides heating charge data (pressure) based on indoor and outdoor temperatures.

Capacity Request Calculations

Defrost Control and Theory

Details defrost calculation parameters, theory, and termination conditions.

Fan and Valve Control Logic

Electronic Expansion Valve (EXV) Control