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Lennox MCFA024S4-2P - User Manual

Lennox MCFA024S4-2P
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INSTALLATION
INSTRUCTIONS
©
2021 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
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
Refer to the Product Specications bulletin (EHB) for more
product information.
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 MCFA and MCFB Ceiling/Floor 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 MCFA/MCFB Indoor
Units
SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Ceiling / Floor Indoor Units
507548-08 10/2021
Supersedes 507548-07
Table of Contents
General .....................................................................................1
Included Parts...........................................................................2
Indoor / Outdoor Unit Match-Ups..............................................2
Model Number Identication .....................................................3
Typical Single-Zone System Components................................4
System Dimensions ..................................................................5
Outdoor Units ................................................................................................... 5
Indoor Units ...................................................................................................... 8
System Clearances ..................................................................8
Outdoor Unit ..................................................................................................... 8
Indoor Unit ........................................................................................................ 9
Torque Requirements for Caps and Fasteners.........................9
Indoor Unit Installation ............................................................10
Unit Placement Considerations ...................................................................... 10
Floor Installation ............................................................................................. 10
Ceiling Installation .......................................................................................... 11
Indoor Unit Condensate Piping Connections ................................................. 11
Outdoor Unit Installation .........................................................12
Placement Considerations ............................................................................. 12
Direct Sunlight, Rain, Snow and Ice Protection .............................................. 12
Prevailing Winds ............................................................................................. 13
Buried Refrigerant Pipe Protection ................................................................. 14
Outdoor Unit Condensate Piping .................................................................... 14
Securing the Outdoor Unit .............................................................................. 14
Refrigerant Piping Connections ..............................................15
Leak Test and Evacuation ......................................................17
Leak Test ........................................................................................................ 17
Triple Evacuation Procedure .......................................................................... 17
Wiring Connections ................................................................17
Outdoor Unit .................................................................................................. 17
Indoor Unit ...................................................................................................... 17
Installation Wiring Requirements .................................................................... 19
Control Board Wiring Connections ................................................................. 20
Unit Start-Up ...........................................................................26
Adding Refrigerant for Longer Line Set ..................................26
Troubleshooting ......................................................................27
Indoor Unit Error Codes ................................................................................. 27
Outdoor Unit Error Codes ............................................................................... 27
Self Clean Feature..................................................................27
Test Run .................................................................................27
Pre-Checks ..................................................................................................... 27
Procedure ....................................................................................................... 27
Dry Mode Operation (Dehumidication) .................................27
Procedure ....................................................................................................... 27
Sequence of Operation .................................................................................. 27

Table of Contents

Questions and Answers

  • B
    barnettmistySep 23, 2025
    What to do if my Lennox MCFA024S4-2P Heat Pump shows an indoor coil temperature sensor error?
    • H
      Hector WrightSep 23, 2025
      If your Lennox Heat Pump is showing an indoor coil temperature sensor error, check the sensor for damage.
  • N
    Nicole MillerAug 25, 2025
    What to do if my Lennox Air Conditioner has a communication error between the indoor and outdoor unit?
    • K
      Kristie FuentesAug 25, 2025
      If your Lennox Air Conditioner displays a communication error between the indoor and outdoor units, check the wiring and connections between these units to ensure they are properly connected.
  • R
    robertadamsAug 25, 2025
    What to do if my Lennox Air Conditioner is experiencing high or low voltage protection?
    • C
      Carmen RobinsonAug 26, 2025
      If your Lennox Air Conditioner is experiencing high or low voltage protection, check the power supply and ensure voltage levels are within the proper specifications.
  • J
    Justin PriceAug 27, 2025
    What to do if my Lennox Air Conditioner's outdoor unit senses a current overload?
    • R
      Ryan WoodsAug 27, 2025
      If your Lennox Air Conditioner's outdoor unit senses a current overload, inspect the electrical connections and the compressor for any issues.
  • L
    ldurhamSep 23, 2025
    How to fix indoor return air temperature sensor error in Lennox Heat Pump?
    • G
      Gordon GomezSep 23, 2025
      If your Lennox Heat Pump has an indoor return air temperature sensor error, replace the temperature sensor.
  • V
    vangaliciaSep 13, 2025
    What causes outdoor current overload in Lennox MCFA024S4-2P Heat Pump?
    • J
      John ButlerSep 13, 2025
      If an outdoor current overload is sensed in your Lennox Heat Pump, examine the outdoor unit for mechanical issues.
  • J
    Joanna PetersenSep 12, 2025
    What to do if my Lennox MCFA024S4-2P Heat Pump (ducted unit) has a high water level alarm?
    • R
      Russell McdanielSep 12, 2025
      If your Lennox Heat Pump (ducted unit) is showing a high water level alarm, clear any blockage in the drain line.
  • D
    dylansantiagoSep 12, 2025
    How to troubleshoot communication error between indoor and outdoor units in Lennox MCFA024S4-2P Heat Pump?
    • C
      Cody HughesSep 12, 2025
      To troubleshoot a communication error between the indoor and outdoor units of your Lennox Heat Pump, verify the communication wiring.
  • P
    porterkaylaSep 4, 2025
    What to do if my Lennox Air Conditioner displays a compressor discharge temperature sensor error?
    • J
      John BerrySep 4, 2025
      If your Lennox Air Conditioner displays a compressor discharge temperature sensor error, replace the compressor discharge temperature sensor.
  • E
    erinjohnsonSep 2, 2025
    What to do if my Lennox Air Conditioner displays an indoor coil temperature sensor error?
    • K
      Kelly MooreSep 2, 2025
      If your Lennox Air Conditioner displays an indoor coil temperature sensor error, check the indoor coil temperature sensor and replace it if necessary.

Summary

Installation Requirements and Procedures

System Clearances

Torque Requirements

Indoor Unit Installation

Detailed steps for installing the indoor unit, including placement and mounting.

Outdoor Unit Installation

Refrigerant Piping and Connections

Outdoor Unit Condensate Piping

Refrigerant Piping Connections

Step-by-step guide for making refrigerant line connections, including flaring and tightening.

Leak Test, Evacuation, and Wiring

Leak Test and Evacuation

Procedures for testing system leaks and removing moisture and non-condensables.

Wiring Connections

Installation Wiring Requirements

Control Board Wiring Diagrams

Unit Operation and Troubleshooting

Unit Start-Up

Steps and checks required before energizing and operating the unit.

Adding Refrigerant for Longer Line Set

Troubleshooting

Lists and explains error codes for indoor and outdoor units.

Test Run

Essential checks and procedures for the unit's operational test run.

Lennox MCFA024S4-2P Specifications

General IconGeneral
Cooling Capacity24, 000 BTU/h
Heating Capacity24, 000 BTU/h
Refrigerant TypeR-410A
Voltage208/230V
Phase1
Compressor TypeScroll
HSPF Rating8.20

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