INSTALLATION
INSTRUCTIONS
©
2018 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.
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.
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 Specications 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 MMDA Medium-Static Ducted indoor units are
matched with an outdoor heat pump unit to create a mini-
split system that uses HFC-410A refrigerant.
MLA/MPA/MPB
and MMDA Series
SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Medium-Ducted Indoor Unit
507547-06
1/2018
Supersedes 12/2017
Table of Contents
General ...........................................................................1
Included Parts.................................................................2
Indoor / Outdoor Unit Match-Ups....................................2
Model Number Identication ...........................................3
Typical System Components ..........................................4
System Dimensions ........................................................5
Outdoor Units ..............................................................5
Indoor Units .................................................................6
System Clearances ........................................................7
Outdoor Unit ................................................................7
Indoor Unit ...................................................................7
Torque Requirements for Caps and Fasteners...............8
Indoor Unit Installation ....................................................8
Unit Placement Considerations ...................................8
Installation ...................................................................8
Installation Guidelines .................................................9
Field-Relocation of Return Air Filter .............................9
Indoor Unit Condensate Piping Connections .............10
Outdoor Unit Installation ...............................................10
Placement Considerations .........................................11
Direct Sunlight, Rain, Snow and Ice Protection ......... 11
Prevailing Winds ........................................................12
Buried Refrigerant Pipe Protection ............................12
Condensate Piping ....................................................13
Securing the Outdoor Unit .........................................13
Refrigerant Piping Connections ....................................13
Leak Test and Evacuation ............................................16
Leak Test ...................................................................16
Triple Evacuation Procedure......................................16
Wiring Connections ......................................................16
Outdoor Unit .............................................................16
Indoor Unit .................................................................16
Unit Start-Up .................................................................26
Adding Refrigerant for Longer Line Set ........................26
Troubleshooting ............................................................27
Test Run .......................................................................27
Pre-Checks ................................................................27
Procedure ..................................................................27
Dry Mode Operation (Dehumidication) .......................27
Procedure ..................................................................27
Sequence of Operation ..............................................27
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