Lennox MWMA009S4-2P - User Manual

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

Summary

Indoor; Outdoor Unit Match-Ups

Typical System Components

System Clearances

Outdoor Unit Clearances

Indoor Unit Clearances

Torque Requirements for Caps and Fasteners

Indoor Unit Installation

Installation of Wall Sleeve

Installation of Indoor Unit on Wall Mounting Plate

Indoor Unit Condensate Piping Connections

Outdoor Unit Installation

Direct Sunlight, Rain, Snow and Ice Protection

Buried Refrigerant Pipe Protection

Outdoor Unit Condensate Piping

Securing the Outdoor Unit

Slab or Roof Mounting

Securing Outdoor Unit to Slab, Frame, or Rails

Securing Outdoor Unit to Hanging Brackets

Refrigerant Piping Connections

Leak Test and Evacuation

Leak Test

Procedure for checking refrigerant system for leaks using nitrogen.

Triple Evacuation Procedure

Steps to remove air and moisture from the system using a vacuum gauge.

Wiring Connections

Outdoor Unit Wiring

Instructions for making electrical power and communication connections to the outdoor unit.

Indoor Unit Wiring

Instructions for making electrical power and communication connections to the indoor unit.

Unit Start-Up

Adding Refrigerant for Longer Line Set

Troubleshooting

Troubleshooting Codes

Table of error codes and their descriptions for system diagnostics.

Test Run

Pre-Checks

Procedure

Double-Check Pipe Connections

Lennox MWMA009S4-2P Specifications