Lennox MLA Series Installation & User's Instructions

2020 Lennox Industries Inc.
©
Dallas, Texas, USA
Table of Contents
General .....................................................................................1
Use of Mini-Split System During Construction..........................1
Included Parts...........................................................................2
Optional Accessories ................................................................2
Indoor / Outdoor Unit Match-Ups..............................................2
Model Number Identification .....................................................3
Typical Single-Zone System Components................................4
System Dimensions ..................................................................5
Outdoor Units .................................................................................... 5
Indoor Units....................................................................................... 5
System Clearances ..................................................................6
Outdoor Unit...................................................................................... 6
Indoor Unit ........................................................................................ 6
Torque Requirements for Caps and Fasteners.........................7
Indoor Unit Installation ..............................................................7
Unit Placement Considerations......................................................... 7
Floor Installation................................................................................ 7
Indoor Unit Condensate Piping Connections .................................... 8
Outdoor Unit Installation ...........................................................8
Placement Considerations ................................................................ 8
Direct Sunlight, Rain, Snow and Ice Protection ................................ 8
Prevailing Winds ............................................................................... 9
Buried Refrigerant Pipe Protection ................................................. 10
Outdoor Unit Condensate Piping .................................................... 10
Securing the Outdoor Unit .............................................................. 10
Refrigerant Piping Connections ..............................................11
Leak Test and Evacuation ......................................................13
Leak Test ........................................................................................ 13
Triple Evacuation Procedure ........................................................... 13
Wiring Connections ................................................................14
Outdoor Unit ................................................................................... 14
Indoor Unit ...................................................................................... 14
Unit Start-Up ...........................................................................17
Adding Refrigerant for Longer Line Set ..................................17
Troubleshooting ......................................................................17
Test Run .................................................................................17
Pre-Checks ..................................................................................... 17
Procedure ....................................................................................... 17
Dry Mode Operation (Dehumidification) .................................18
Procedure ....................................................................................... 18
Sequence of Operation ................................................................... 18
User Guide .............................................................................18
Default Settings............................................................................... 18
Auto-Restart .................................................................................... 18
Louver Angle Memory Function ...................................................... 18
Refrigerant Leak Detection System ................................................ 18
Manual Operations.......................................................................... 18
Adjusting Airflow Direction .............................................................. 19
Adjust the Air Flow Direction Left and Right ................................... 19
How to Clean the Air Filter .............................................................. 19
Error Codes..................................................................................... 19
Optional Programmable Wired Controller...............................20
Programmable ................................................................................ 20
Non-Programmable......................................................................... 20
INSTALLATION/USER
INSTRUCTIONS
SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Floor Mount Console
508048-01 7/2020
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.
General
Refer to the Product Specifications 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 MFMA Floor Mount Console unit is matched with an
outdoor heat pump unit to create a mini-split system that
uses HFC-410A refrigerant.

Use of Mini-Split System During Construction

Lennox does not recommend the use of its mini-split
systems during any phase of construction. Very low return
air temperatures, harmful vapors and operation of the unit
with clogged or misplaced filters will damage the system.
However, mini-split systems may be used for cooling of
buildings under construction, if the following conditions
are met:
• Air filter must be installed in the system and must be
maintained during construction.
• Air filter must be replaced upon construction comple-
tion.
• The indoor wall unit assembly must be thoroughly
cleaned following final construction clean-up.
• All mini-split operating conditions must be verified ac-
cording to these installation instructions.
MLA/MPB and
MFMA Series