Lennox MCFA024S4-2P - User Manual

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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

Main Page

Questions and Answers

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.
S
Scott HowellSep 9, 2025
How to fix high or low voltage protection error in Lennox Heat Pump?
- M
  mcruzSep 9, 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.
M
martinezdominiqueSep 8, 2025
Why is there a high temperature sensed at the compressor top of my Lennox MCFA024S4-2P?
- B
  Brooke SmithSep 8, 2025
  If a high temperature is sensed at the compressor top of your Lennox Heat Pump, check the refrigerant level and airflow.
J
Jacob ValdezSep 7, 2025
What to do if my Lennox MCFA024S4-2P has low refrigerant?
- C
  collinsdanielSep 7, 2025
  If your Lennox Heat Pump has low refrigerant, check for leaks and recharge the system if necessary.
C
Charlene HarrisAug 23, 2025
What to do if my Lennox Air Conditioner has a high water level alarm?
- K
  Kenneth GarciaAug 23, 2025
  If your Lennox Air Conditioner triggers a high water level alarm, clear any blockage in the drain line.
D
Dale SimsSep 5, 2025
What to do if my Lennox Air Conditioner displays an inverter module IPM error?
- A
  Austin TorresSep 5, 2025
  If your Lennox Air Conditioner displays an inverter module IPM error, inspect the inverter module for faults.
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.
B
bbanksSep 3, 2025
What to do if my Lennox Air Conditioner displays an outdoor coil temperature sensor error?
- A
  Amanda MartinezSep 3, 2025
  If your Lennox Air Conditioner displays an outdoor coil temperature sensor error, examine the outdoor coil temperature sensor and replace it if necessary.
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.
E
Elizabeth LiSep 1, 2025
What to do if my Lennox Air Conditioner displays an indoor return air temperature sensor error?
- M
  Makayla PhillipsSep 1, 2025
  If your Lennox Air Conditioner displays an indoor return air temperature sensor error, replace the indoor return air temperature sensor.