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Lennox MLB Series - User Manual

Lennox MLB Series
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INSTALLATION
INSTRUCTIONS
©
2024 Lennox Industries Inc.
Dallas, Texas, USA
WARNING
Improper installation, adjustment, alteration, ser vice or
maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li censed
professional HVAC installer (or equivalent) or a service
agency.
WARNING
The clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs, and HFCs) as of July, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
General
These instructions are intended as a general guide and
do not supersede local or national codes in any way.
Authorities having jurisdiction should be consulted before
installation.
The MWMC wall-mounted indoor units are matched with
an outdoor heat pump unit to create a mini-split system
that uses HFC-410A refrigerant.
MLB/MPC Outdoor Units
with MWMC Indoor Units
SINGLE-ZONE MINI-SPLIT SYSTEMS
(115V and 208/230V) --
Wall-Mounted Indoor Unit
507545-07 04/2024
Supersedes 02/2024
Table of Contents
General .....................................................................................1
Included Parts...........................................................................2
Model Number Identication .....................................................3
Indoor / Outdoor Unit Match-Ups..............................................4
System Dimensions ..................................................................5
Outdoor Units ................................................................................................... 5
Indoor Units ...................................................................................................... 8
Wall Mounting Plates ........................................................................................ 9
System Clearances ................................................................11
Outdoor Unit ................................................................................................... 11
Indoor Unit ...................................................................................................... 11
Torque Requirements for Caps and Fasteners.......................12
Indoor Unit Installation ............................................................12
Unit Placement Considerations ...................................................................... 12
Determining Wall Mounting Plate Location .................................................... 12
Installation of Wall Mounting Plate ................................................................. 13
Installation of Wall Sleeve .............................................................................. 13
Installation of Indoor Unit on Wall Mounting Plate .......................................... 13
Indoor Unit Condensate Piping Connections ................................................. 14
Outdoor Unit Installation .........................................................14
Placement Considerations ............................................................................. 14
Direct Sunlight, Rain, Snow and Ice Protection .............................................. 15
Prevailing Winds ............................................................................................. 16
Buried Refrigerant Pipe Protection ................................................................. 16
Outdoor Unit Condensate Piping .................................................................... 16
Securing the Outdoor Unit .............................................................................. 17
Refrigerant Piping Connections ..............................................17
Leak Test and Evacuation ......................................................19
Leak Test ........................................................................................................ 19
Triple Evacuation Procedure .......................................................................... 20
Wiring Connections ................................................................20
Outdoor Unit .................................................................................................. 20
Indoor Unit ...................................................................................................... 20
Unit Start-Up ...........................................................................28
Adding Refrigerant for Longer Line Set ..................................29
Troubleshooting ......................................................................29
I-Clean Feature.......................................................................30
Test Run .................................................................................31
Pre-Checks ..................................................................................................... 31
Procedure ....................................................................................................... 31
Double-Check Pipe Connections ................................................................... 31
If Ambient Temperature is below 60°F (16°C) ................................................ 31
Dry Mode Operation (Dehumidication) .................................31
Procedure ....................................................................................................... 31
Sequence of Operation .................................................................................. 31
Humidity Control .....................................................................32
Intelligent Eye Function .........................................................32
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

Table of Contents

Questions and Answers

  • E
    Erica RobinsonAug 20, 2025
    What to do if my Lennox Heat Pump has low refrigerant?
    • A
      Andrea ColemanAug 20, 2025
      If your Lennox Heat Pump has low refrigerant, check for leaks and recharge the system if necessary.
  • C
    Connie HicksAug 22, 2025
    Why is there a high temperature sensed at the compressor top of my Lennox Heat Pump?
    • E
      Elijah DayAug 22, 2025
      If a high temperature is sensed at the compressor top of your Lennox Heat Pump, check the refrigerant level and airflow.
  • M
    Matthew BowersAug 25, 2025
    How to fix high or low voltage protection error in Lennox Heat Pump?
    • S
      Samantha RodriguezAug 25, 2025
      To address a high or low voltage protection issue in your Lennox Heat Pump, ensure that the voltage levels are within the specified range.
  • D
    Daniel SmithAug 27, 2025
    What to do if my Lennox Heat Pump (ducted unit) has a high water level alarm?
    • P
      Patricia ShieldsAug 27, 2025
      If your Lennox Heat Pump (ducted unit) is showing a high water level alarm, clear any blockage in the drain line.
  • P
    Patrick CaseyAug 28, 2025
    How to troubleshoot communication error between indoor and outdoor units in Lennox Heat Pump?
    • P
      Patricia SchmittAug 28, 2025
      To troubleshoot a communication error between the indoor and outdoor units of your Lennox Heat Pump, verify the communication wiring.
  • M
    Michelle MartinezAug 30, 2025
    What causes outdoor current overload in Lennox Heat Pump?
    • J
      Joshua RamirezAug 30, 2025
      If an outdoor current overload is sensed in your Lennox Heat Pump, examine the outdoor unit for mechanical issues.
  • S
    stacybrownSep 1, 2025
    What to do if my Lennox Heat Pump shows a compressor drive error?
    • L
      lawsondavidSep 1, 2025
      If your Lennox Heat Pump is showing a compressor drive error, check the compressor wiring.
  • K
    Kathleen OchoaSep 2, 2025
    How to fix indoor fan speed error in Lennox Heat Pump?
    • S
      Shannon GravesSep 2, 2025
      If you're experiencing an indoor fan speed error with your Lennox Heat Pump, inspect the fan and control settings.
  • C
    Carla DixonSep 4, 2025
    What to do if my Lennox Heat Pump has an outdoor unit fan speed error?
    • J
      Jonathan MartinezSep 4, 2025
      If your Lennox Heat Pump is displaying an outdoor unit fan speed error, inspect the fan operation.
  • F
    fosterkaylaSep 6, 2025
    What should I do if the high or low pressure switch is open on my Lennox Heat Pump?
    • W
      williamsvanessaSep 6, 2025
      If the high or low pressure switch is open on your Lennox Heat Pump, test the pressure switches.

Summary

General Information

General Guidance

General installation guidance and disclaimer about local codes and refrigerant.

Included Parts

Lists all components included in the indoor and outdoor unit packages for installation.

Model Identification & Match-Ups

Explains model numbering and compatible indoor/outdoor unit combinations.

Unit Specifications

System Dimensions

Provides dimensional diagrams and specifications for outdoor and indoor units.

Wall Mounting Plates

Shows dimensions and mounting details for indoor unit wall plates.

System Clearances

Specifies minimum required clearances for outdoor and indoor units for proper operation.

Installation Procedures

Indoor Unit Installation & Placement

Guidelines for indoor unit placement, wall plate location, and mounting.

Indoor Unit Condensate Piping

Instructions for correctly connecting and ensuring proper drainage of the indoor unit condensate line.

Outdoor Unit Installation & Placement

Guidance on outdoor unit placement, protection from elements, and securing methods.

Refrigerant Piping & Connections

Steps for making refrigerant line connections, including pipe sizing, flaring, and insulation.

System Testing & Wiring

Leak Test & Evacuation

Procedure for leak testing and evacuating the refrigerant system to remove non-condensables and moisture.

Triple Evacuation Procedure

Step-by-step guide for performing a triple evacuation to ensure system purity.

Wiring Diagrams & Connections

Instructions and diagrams for electrical wiring connections and system diagrams.

Operation & Troubleshooting

Unit Start-Up

Essential pre-energization checks and steps to safely start up the HVAC unit.

Refrigerant Charge Adjustment

Guidance on calculating and adding extra refrigerant for extended line sets.

Special Features & Modes

Explanation of I-Clean, Test Run, Dry Mode, Humidity Control, and Intelligent Eye.

Lennox MLB Series Specifications

General IconGeneral
BrandLennox
ModelMLB Series
CategoryIndoor Furnishing
LanguageEnglish

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