Lennox MPB048S4S-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 MPB048S4S-1P Specifications

General

Brand	Lennox
Model	MPB048S4S-1P
Category	Air Conditioner
Language	English

Summary

Model Number Identification

Indoor Outdoor Unit Match-Ups

System Clearances

Indoor Unit Installation

Indoor Unit Condensate Piping Connections

Outdoor Unit Installation

Direct Sunlight, Rain, Snow and Ice Protection

Securing the Outdoor Unit

Refrigerant Piping Connections

Making Refrigerant Flare Connections

Provides instructions on how to make flare connections, including lubrication and torque.

Leak Test and Evacuation

System Leak Testing Procedure

Outlines the steps for performing a leak test using dry nitrogen gas.

Pressure Test Specifications

Lists pressure test specifications and durations for verifying system integrity.

Triple Evacuation Procedure

Evacuation Steps (MicronsTorr)

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

Wiring Connections

General Wiring Precautions

Covers essential safety precautions and compliance with local electrical codes for wiring.

Outdoor Unit Wiring

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

Indoor Unit Wiring

Explains power and communication wiring for indoor units, including conductor requirements.

Single Zone Wiring Diagram (36 K48 K)

Illustrates the wiring configuration for single zone systems of 36K and 48K units.

M22 AM33 AM33 B Wiring Diagram

Provides the specific wiring diagram for M22A, M33A, and M33B indoor units.

M33 AM33 B (36 K48 K) Indoor Unit Wiring

Details the wiring for specific M33A/M33B indoor units, including components and connections.

MPA (009012) Outdoor Unit Wiring

Illustrates the wiring connections for MPA outdoor units of 009 and 012 capacity.

MPA (018) Outdoor Unit Wiring

Provides the wiring diagram for the MPA018S4S outdoor unit.

MPA (024) Outdoor Unit Wiring

Details the wiring diagram for the MPA024S4S outdoor unit.

MPA (036) Outdoor Unit Wiring

MPA (048) Outdoor Unit Wiring

MPB (009012) Outdoor Unit Wiring

MPB (018024) Outdoor Unit Wiring

MPB (036) Outdoor Unit Wiring

MPB (048) Outdoor Unit Wiring

MLA (009012018) Outdoor Unit Wiring

Unit Start-Up

Pre-Start Up Checks

Lists essential checks before starting the unit, including electrical safety and refrigerant leaks.

Unit Start-Up Procedure

Guides on energizing the unit, checking voltage, and verifying fan operation.

Adding Refrigerant for Longer Line Set

Refrigerant Calculation for Line Length

Troubleshooting

Troubleshooting Error Codes

Lists common error codes (E0-E5, EC, EE, F0-F5, P0-P6) and their descriptions.

Test Run Procedure

Details the steps for conducting a test run, including pre-checks and a checklist.

Dry Mode Operation Guide

Explains how to operate the unit in dry mode (dehumidification) and its limitations.

Sequence of Operation (Dry Mode)