Lennox MPB018S4M 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 MPB018S4M Specifications

General

Model	MPB018S4M
Cooling Capacity	18, 000 BTU/h
Refrigerant	R-410A
Voltage	208/230V
Compressor Type	Inverter
Phase	1
Fan Speed	Variable
Type	Air Conditioner
Stages	Variable

Summary

Single and Multiple Zone Outdoor Units

MPA Single-Zone Specifications (0.75-1.5 Ton)

Provides detailed technical specifications for MPA single-zone outdoor units, covering capacities from 0.75 to 1.5 tons.

MPA Single-Zone Specifications (2.0-4.0 Ton)

Provides detailed technical specifications for MPA single-zone outdoor units, covering capacities from 2.0 to 4.0 tons.

MPB Single-Zone Specifications (0.75-1.5 Ton)

Provides detailed technical specifications for MPB single-zone outdoor units, covering capacities from 0.75 to 1.5 tons.

MPB Single-Zone Specifications (2-4 Ton)

Provides detailed technical specifications for MPB single-zone outdoor units, covering capacities from 2 to 4 tons.

MLA Single-Zone Specifications (0.75-2 Ton)

Provides detailed technical specifications for MLA single-zone outdoor units, covering capacities from 0.75 to 2 tons.

MPA Multi-Zone Specifications (1.5-2.5 Ton)

Provides detailed technical specifications for MPA multi-zone outdoor units, capacities 1.5 to 2.5 tons.

MPA Multi-Zone Specifications (3-4 Ton)

Provides detailed technical specifications for MPA multi-zone outdoor units, capacities 3 to 4 tons.

MPB Multi-Zone Specifications (1.5-2.5 Ton)

Provides detailed technical specifications for MPB multi-zone outdoor units, capacities 1.5 to 2.5 tons.

MPB Multi-Zone Specifications (3-4 Ton)

Provides detailed technical specifications for MPB multi-zone outdoor units, capacities 3 to 4 tons.

MLA Multi-Zone Specifications (1.5-3 Ton)

Provides detailed technical specifications for MLA multi-zone outdoor units, capacities 1.5 to 3 tons.

M22A, M33A and M33B Cassette Non-Ducted Indoor Units

M22A Indoor Unit Specifications

Details specifications for M22A cassette non-ducted indoor units, including electrical and performance data.

M33A and M33B Indoor Unit Specifications

Details specifications for M33A and M33B cassette non-ducted indoor units, including electrical and performance data.

MMDA Ducted Indoor Units

Indoor Unit Specifications

Details specifications for MMDA ducted indoor units, including electrical and performance data.

MWMA and MWMB Wall Mounted Indoor Units

Indoor Unit Specifications (009 - 012 Ton) Units

Details specifications for MWMA/MWMB indoor units in the 009-012 ton range.

Indoor Unit Specifications (018 - 030 Ton) Units

MCFA and MCFB Ceiling / Floor Indoor Units

Indoor Unit Specifications (018 - 048 Ton) Units

Refrigeration Pipe Work

MPA and MPB Single-Zone Refrigerant Cycle Diagram

MPA and MPB Two-Zone Refrigerant Cycle Diagram

MPA and MPB Three-Zone Refrigerant Cycle Diagram

MPA and MPB Four-Zone Refrigerant Cycle Diagram

MPA and MPB Five-Zone Refrigerant Cycle Diagram

Power Wiring for Outdoor and Indoor Units (Diagrams)

Outdoor Unit Diagrams

MPA and MPB Single-Zone

MLA Single-Zone

MPA and MPB Multi-Zone

MLA Multi-Zone

Indoor Unit Diagrams

MWMA and MWMB Indoor Unit

M22A Indoor Unit

M33A and M33B Indoor Unit

MMDA Indoor Units

MCFA and MCFB Indoor Units

Controls

M0STAT60Q-1 Wireless Remote

M0STAT61Q-1 Wired Remote

Start-Up

Adding Refrigerant - Single-Zone Systems

Instructions for calculating and adding refrigerant to single-zone systems.

Adding Refrigerant - Multi-Zone Systems

Instructions for calculating and adding refrigerant to multi-zone systems.

Test Run - MWDA and MWMB

Provides instructions and a checklist for performing a test run on MWDA and MWMB units.

Double-Check Pipe Connections

Quick Reference Guide - Error Codes

Troubleshooting Outdoor Unit Error Codes

Troubleshooting Indoor Unit Error Codes

Error Code CP

Troubleshooting steps for error code CP (Cap missing or not making contact) on MWMA units.

Error Code E0

Troubleshooting steps for Indoor Unit EEPROM malfunction (Error Code E0).

Component Troubleshooting

Compressor Check

Procedure for checking compressor winding resistance to identify shorts or terminal issues.

IPM Check

Instructions for measuring resistance across IPM terminals to check for faults.

AC Fan Motor

Four-Way Valve

EXV Check

Component Protection

Fan Motor

Inverter Module Protection

Low Voltage Protection

Compressor Current Limit Protection

Specifications and Operations

Capacity Request Calculations

Provides formulas and tables for calculating system capacity based on indoor units and temperature.

Defrost Control

Details the conditions and logic for initiating and managing the defrost cycle.

Defrost Theory

Defrost Termination

Outdoor Fan Control

Four-Way Valve Control

Electronic Expansion Valve (EXV) Control

Details the control logic and operation of the Electronic Expansion Valve (EXV) in cooling and heating.