Lennox MWMA012S4-*L - User Manual

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 MWMA012S4-*L Specifications

General

Brand	Lennox
Model	MWMA012S4-*L
Category	Air Conditioner
Language	English

Summary

Single and Multiple Zone Outdoor Units

Outdoor Unit Clearances

Details necessary clearances around outdoor units for proper installation and airflow.

MCFA and MCFB Ceiling; Floor Indoor Units

Model Number Identification

Explains the model number structure for MCFA and MCFB ceiling/floor indoor units.

Indoor Unit Clearances

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

Power Wiring for Outdoor and Indoor Units (Diagrams)

Connection to Centralized Controller

Set Indoor Unit Address for Centralized Control

Instructions for setting unique addresses for indoor units for centralized system control.

Start-Up

Adding Refrigerant - Single-Zone Systems

Procedures for adding the correct amount of refrigerant to single-zone systems.

Adding Refrigerant - Multi-Zone Systems

Procedures for adding the correct amount of 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 compressor winding resistance and identify terminals.

IPM Check

Procedure to measure the resistance of the IPM windings.

AC Fan Motor

Four-Way Valve

EXV Check

Component Protection

Specifications and Operations

Capacity Request Calculations

Formula and methods for calculating system capacity requests based on conditions.

Defrost Control

Explains conditions and procedures for defrost control based on temperature and runtime.

Electronic Expansion Valve (EXV) Control