Lennox MPB012S4S-1P

INSTALLATION
INSTRUCTIONS
©
2016 Lennox Industries Inc.
Dallas, Texas, USA
MLA/MPA/MPB and
M22A/M33A/M33B Series
SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Cassette-Mounted Indoor Unit
507546-06
10/2017
Supersedes 10/2016
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 Specications 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 M22A, M33A and M33B ceiling cassette indoor units
are matched with an outdoor heat pump unit to create a
mini-split system that uses HFC-410A refrigerant.
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 ........................................................9
Outdoor Unit .................................................................9
Indoor Unit ....................................................................9
Torque Requirements for Caps and Fasteners.............10
Indoor Unit Installation ..................................................10
Unit Placement Considerations ..................................10
Installation of Cassette Base ......................................10
Installation of M33 Cassette Cover Panel...................11
Indoor Unit Condensate Piping Connections ..............13
Outdoor Unit Installation ...............................................13
Placement Considerations ..........................................13
Direct Sunlight, Rain, Snow and Ice Protection ..........14
Prevailing Winds .........................................................15
Buried Refrigerant Pipe Protection .............................15
Outdoor Unit Condensate Piping ................................15
Securing the Outdoor Unit ..........................................16
Refrigerant Piping Connections ....................................17
Leak Test and Evacuation ............................................18
Leak Test ....................................................................18
Triple Evacuation Procedure .......................................18
Wiring Connections ......................................................19
Outdoor Unit ..............................................................19
Indoor Unit ..................................................................19
Unit Start-Up .................................................................27
Adding Refrigerant for Longer Line Set ........................27
Troubleshooting ............................................................28
Test Run .......................................................................28
Pre-Checks .................................................................28
Procedure ...................................................................28
Dry Mode Operation (Dehumidication) .......................28
Procedure ...................................................................28
Sequence of Operation ...............................................28
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

Lennox MPB012S4S-1P Specifications

General

Brand	Lennox
Model	MPB012S4S-1P
Category	Air Conditioner
Language	English

Summary

General Installation Information

Safety Warnings and Cautions

Important safety warnings and precautions for installation.

Model Number Identification

Cassette Non-Ducted Indoor Units

Explanation of model number coding for indoor units.

Outdoor Heat Pump Units

Explanation of model number coding for outdoor units.

IndoorOutdoor Unit Match-Ups

System Dimensions

Outdoor Unit Dimensions

Table providing physical dimensions for outdoor units.

System Clearances

Outdoor Unit Clearances

Specifies clearance requirements for outdoor unit installation.

Indoor Unit Clearances

Installation Procedures

Torque Requirements for Fasteners

Specifies torque values for various fasteners used in installation.

Unit Placement Considerations

Installation of Cassette Base

Refrigerant Piping Connections

Leak Test and Evacuation

Leak Test Procedure

Steps for performing a leak test on the refrigerant system using nitrogen.

Leak Test and Evacuation (Continuation)

Triple Evacuation Procedure

Multi-step procedure for evacuating the system to a low micron level.

Wiring Connections

General Wiring Guidelines

Important considerations for making electrical connections safely and correctly.

Unit Start-Up

Important Start-Up Precautions

Critical steps and checks before energizing the unit for initial operation.

Adding Refrigerant for Longer Line Set

Procedure for calculating and adding refrigerant based on line set length.

Troubleshooting and Operation

Troubleshooting Codes

List of error codes and their descriptions for diagnosing unit issues.

Test Run Procedure