Lennox M22A012S4-*P

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
CORP1602-L9
3/2017
Supersedes 10/2016
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss
of life.
Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or service agency

Lennox M22A012S4-*P Specifications

General

Cooling Capacity	12, 000 BTU/h
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Hertz	60 Hz

Summary

MINI-SPLIT SYSTEMS SERVICE MANUAL

Single and Multiple Zone Outdoor Units

MPA Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton)

Details specifications for MPA single-zone outdoor units from 0.75 to 1.5 tons.

MPA Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton)

Details specifications for MPA multi-zone outdoor units from 1.5 to 2.5 tons.

M22 A, M33 A and M33 B Cassette Non-Ducted Indoor Units

Model Number Identification

Explains how to identify model numbers for M22A, M33A, M33B indoor units.

M22 A Indoor Unit Specifications

Lists the technical specifications for M22A indoor units.

MMDA Ducted Indoor Units

Indoor Unit Specifications

Lists the technical specifications for MMDA ducted indoor units.

MWMA and MWMB Wall Mounted Indoor Units

Indoor Unit Specifications (009 - 012 Ton) Units

Lists specifications for MWMA/MWMB units from 009 to 012 Ton.

Refrigeration Pipe Work

MPA and MPB Single-Zone Refrigerant Cycle Diagram

Single-Zone Piping Limitations

Master Valves (3- to 5-Zone Outdoor Units)

MPA, MPB and MLA Outdoor Unit Connections and Line Set Usage

Power Wiring for Outdoor and Indoor Units (Diagrams)

Condensate Pipe Work Installation

Indoor Unit Gravity Drain

Connection to Centralized Controller

Set Indoor Unit Address for Centralized Control

Steps to set unique addresses for indoor units connected to a controller.

Indoor Unit Connection Points for ONOFF Device

Indoor Unit Connection Points for Alarm Device

Start-Up

Adding Refrigerant - Single-Zone Systems

Procedures for adding refrigerant to single-zone systems.

Adding Refrigerant - Multi-Zone Systems

Procedures for adding refrigerant to multi-zone systems.

Quick Reference Guide - Error Codes

Single-Zone Outdoor Unit LED Locations

Multi-Zone Outdoor Unit LEDs and SW1 Locations

Troubleshooting Outdoor Unit Error Codes

Troubleshooting Indoor Unit Error Codes

Component Troubleshooting

Compressor Check

Steps to check the compressor.

IPM Check

Procedure for checking the IPM module.

AC Fan Motor

Four-Way Valve

EXV Check

Component Protection

Fan Motor

Inverter Module Protection

Low Voltage Protection