Lennox MWMA012S4-2P

INSTALLATION
INSTRUCTIONS
©
2017 Lennox Industries Inc.
Dallas, Texas, USA
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
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 MWMA and MWMB wall-mounted 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
MWMA/MWMB Series
SINGLE-ZONE MINI-SPLIT SYSTEMS
(115V and 208/230V) --
Wall-Mounted Indoor Unit
507545-06
4/2017
Supersedes 10/2016
Table of Contents
General ...........................................................................1
Included Parts.................................................................2
Model Number Identication ...........................................3
Indoor / Outdoor Unit Match-Ups....................................4
Typical System Components ..........................................5
System Dimensions ........................................................6
Outdoor Units ..............................................................6
Indoor Units .................................................................7
System Clearances ........................................................8
Outdoor Unit ................................................................8
Indoor Unit ...................................................................8
Torque Requirements for Caps and Fasteners...............9
Indoor Unit Installation ....................................................9
Unit Placement Considerations ...................................9
Determining Wall Mounting Plate Location ..................9
Installation of Wall Mounting Plate...............................9
Installation of Wall Sleeve..........................................10
Installation of Indoor Unit on Wall Mounting Plate .....10
Indoor Unit Condensate Piping Connections .............12
Outdoor Unit Installation ...............................................12
Placement Considerations .........................................12
Direct Sunlight, Rain, Snow and Ice Protection .........13
Prevailing Winds ........................................................14
Buried Refrigerant Pipe Protection ............................14
Outdoor Unit Condensate Piping ...............................14
Securing the Outdoor Unit .........................................15
Refrigerant Piping Connections ....................................15
Leak Test and Evacuation ............................................18
Leak Test ...................................................................18
Triple Evacuation Procedure......................................18
Wiring Connections ......................................................18
Outdoor Unit .............................................................18
Indoor Unit .................................................................18
Unit Start-Up .................................................................26
Adding Refrigerant for Longer Line Set ........................26
Troubleshooting ............................................................26
Test Run .......................................................................26
Pre-Checks ................................................................26
Procedure ..................................................................26
Double-Check Pipe Connections ...............................27
If Ambient Temperature is below 63°F (17°C) ...........27
Dry Mode Operation (Dehumidication) .......................27
Procedure ..................................................................27
Sequence of Operation ..............................................27
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

Lennox MWMA012S4-2P Specifications

General

Brand	Lennox
Model	MWMA012S4-2P
Category	Air Conditioner
Language	English

Summary

System Clearances

Outdoor Unit

Specifies required clearances for outdoor unit installation.

Indoor Unit

Torque Requirements for Caps and Fasteners

Indoor Unit Installation

Wall Mounting Plate and Sleeve Installation

Mounting the Indoor Unit

Indoor Unit Condensate Piping Connections

Outdoor Unit Installation

Placement Considerations

Securing the Outdoor Unit

Slab or Roof Mounting

Refrigerant Piping Connections

Explains how to connect refrigerant piping and the necessary insulation.

Leak Test and Evacuation

Leak Test

Procedure for testing the system for refrigerant leaks.

Triple Evacuation Procedure

Steps for evacuating the refrigerant system using a micron gauge.

Wiring Connections

Outdoor Unit

Electrical connection guidelines for the outdoor unit.

Indoor Unit

Electrical connection guidelines for the indoor unit.

Unit Start-Up

Adding Refrigerant for Longer Line Set

Troubleshooting

Lists error codes and their descriptions for diagnosing issues.

Test Run

Double-Check Pipe Connections