Lennox MCFA Series User Manual

USER GUIDE
©
2021 Lennox Industries Inc.
Dallas, Texas, USA
MCFA, MCFB, MFMA,
MMDB, MWMC, 3WMC,
M22A and M33C
Indoor Units
MINI-SPLIT SYSTEM INDOOR UNITS
507550-06 7/2021
Supersedes 507550-05
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
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
DO NOT spray water on the indoor unit for any reason.
Do not touch the unit or the controller if your hands are
wet.
Do not insert your hands, tools or any other item into the
air intake or air outlet at either the indoor or outdoor unit.
Do not remove the outdoor unit fan guard for any reason.
CAUTION
If outdoor unit is installed on a raised stand, check
condition of stand occasionally to ensure that it remains
stable.
Do NOT install sprinklers or soaker hoses where they
can expose the outdoor unit to treated water. Prolonged
exposure to treated water will corrode the surface
of the steel and aluminum parts and will diminish the
performance of the unit.
IMPORTANT
System operation is controlled by either a wired or
wireless remote control. Refer to the manual provided
with the control for system operation.
To ensure comfort, make sure that temperature selection
has been properly set at the unit controller or wireless
remote control.
To ensure efcient operation, do not block air intake or
outlet at either the indoor or outdoor unit.
Do not stand on outdoor unit or store items on top of
unit.
Make sure that indoor unit directional louvers are
properly adjusted.
MCFA and MCFB Ceiling
or Floor-Mounted
Convertible
MMDB Medium Static Ducted
MWMC and 3WMC
Wall-Mounted
M22A and M33C Cassette
THIS MANUAL MUST BE LEFT WITH THE
OWNER FOR FUTURE REFERENCE
MFMA Floor Mount Console

Lennox MCFA Series Specifications

General

Brand	Lennox
Model	MCFA Series
Category	Air Conditioner
Language	English

Summary

User Guide Introduction and Safety

General Safety Warnings

Important safety information regarding electrical hazards, fire, and explosion risks during unit operation and maintenance.

Operational Precautions

Guidance on preventing property damage and injury by following proper installation, adjustment, and maintenance procedures.

Important Operational Notes

Key points for ensuring comfort and efficiency, including remote control usage and airflow management.

Unit Components Identification

Cassette and Ceiling/Floor Mounted Units

Identifies parts for M22A, M33C Cassette and MCFA/MCFB Ceiling/Floor units.

Ducted and Wall-Mounted Units

Details components for MMDA/MMDB Ducted and MWMC/3WMC Wall-Mounted units.

Floor Mount Console

Identifies parts for the MFMA Floor Mount Console indoor unit.

Louver Adjustment Procedures

Cassette Unit Louver Control

Instructions for adjusting louvers on M22/M33C ceiling-mounted cassette units using remote controls.

Wall-Mounted Unit Louver Control

Guidance on setting louvers for MWMC/3WMC wall-mounted units via remote control.

Ceiling/Floor Unit Louver Control

Steps for adjusting louvers on MCFB/MFMA units using wired or wireless remote controls.

Maintenance and Filter Cleaning

General Maintenance Precautions

Safety warnings and cleaning guidelines for indoor units and remote controls during maintenance.

Return Air Filter Maintenance

Instructions for checking, cleaning, and replacing return air filters for proper airflow.

M22A/M33C Filter Removal and Cleaning

Detailed steps for removing and cleaning air filters specific to M22A and M33C cassette units.

Unit Preparation and Troubleshooting

MFMA Filter Removal and Idle Prep

Steps for MFMA filter removal and preparing the unit for prolonged periods of inactivity.

Console LED Display Overview

Explanation of various indicator lights on the indoor unit console and their meanings.

Troubleshooting Introduction

Guidance on immediate actions for critical issues and checks for normal operation before calling service.

Troubleshooting Normal Operations and Sounds

Normal Operation Scenarios

Describes normal system behaviors like fan operation, compressor delays, and white mist during specific modes.

Troubleshooting Table

Lists common symptoms, possible causes, and solutions for unit malfunctions.

Troubleshooting and Error Code Identification

Troubleshooting Unit Issues

Addresses unit heating problems, fan speed control, and remote signal issues with solutions.

Indoor Unit Error Codes

Details various error codes displayed on the unit and their corresponding programmable wired controller codes.

Error Codes and Self Clean Feature

Additional Error Codes

Lists further error codes for different unit types and their potential causes, including sensor and communication errors.

Self Clean Functionality

Explains how to activate and the sequence of the self-clean feature to dry the indoor coil and prevent mold.