Lennox MPC User Manual

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
Indoor and Outdoor Unit Information
100029
5/2022
Table of Contents
Indoor Unit Information ...................................3
1. M22A and M33C Cassette Non-Ducted Indoor Units ............... 3
1.1. ModelNumberIdentication ........................................................3
1.2. M22AIndoorUnitSpecications ..................................................3
1.3. M33CIndoorUnitSpecications .................................................4
1.4. M22AIndoorUnitDimensions .....................................................5
1.5. M33CIndoorUnitDimensions .....................................................6
1.6. M22AandM33CIndoorUnitClearances ....................................7
1.7. M22AandM33CIndoorUnitControlBoardSwitches
Location .......................................................................................8
1.8. M22AandM33CCondensateDrainTestProcedure ...................9
2. MMDB Ducted Indoor Units ......................................................10
2.1. MMDBModelNumberIdentication ..........................................10
2.2. MMDBIndoorUnitSpecications .............................................. 11
2.3. IndoorUnitBlowerData ............................................................12
2.4. MMDBIndoorUnitDimensions .................................................18
2.5. MMDBIndoorUnitClearances ..................................................19
2.6. CondensatePumpLift-MMDBandM22A/M33C .....................20
2.7. MMDBCondensateDrainTestProcedure.................................20
2.8. MMDBIndoorUnitGravityDrain ...............................................21
3. MWMC and 3WMC-036 Wall Mounted Indoor Units ............... 22
3.1. ModelNumberIdentication ......................................................22
3.2. IndoorUnitSpecications(009-012Ton)Units ......................23
3.3. IndoorUnitSpecications(018-030Ton)Units .......................23
3.4. IndoorUnitSpecications(3WMC) ...........................................23
3.5. IndoorUnitDimensions(MWMCand3WMC) ...........................24
3.6. IndoorUnitClearances(AllModelsandSizes) .........................25
3.7. MWMCand3WMC036S4UnitControlBoardSwitches
Location .....................................................................................25
3.8. DryModeOperation-MWMCand3WMC ................................26
3.9. TestRun-MWMCand3WMC ..................................................26
3.10. Double-CheckPipeConnections ...............................................26
3.11. AmbientTemperatureisBelow63°F(17°C) .............................27
4. MCFA and MCFB Ceiling / Floor Indoor Units ........................28
4.1. ModelNumberIdentication ......................................................28
4.2. IndoorUnitSpecications(018-048Ton)Units .......................28
4.3. IndoorUnitDimensions .............................................................29
4.4. IndoorUnitClearances ..............................................................30
4.5. MCFAandMCFBIndoorUnitControlBoardSwitches
Location .....................................................................................31
5. MFMA Floor Indoor Unit ...........................................................32
5.1. ModelNumberIdentication ......................................................32
5.2. IndoorUnitSpecications(012Ton)Unit ..................................32
5.3. IndoorUnitDimensions .............................................................33
5.4. IndoorUnitClearances ..............................................................33
6. Indoor and Outdoor Power and Communication
Wiring Requirements ............................................................... 34
6.1. Overview ....................................................................................34
6.2. WiringGuide ..............................................................................35
MCFA and MCFB
M22A and M33C
MMDB
MWMC and 3WMC036
MPC, 3PC, and MLB
Single Zone
MLB and MPC
Multi-Zone
MFMA
Please refer to service manual 100030 for indoor and
outdoor unit error codes and component diagnostics.

Lennox MPC Specifications

General

Brand	Lennox
Model	MPC
Category	Air Conditioner
Language	English

Summary

M22A and M33C Cassette Non-Ducted Indoor Units

M22A Indoor Unit Specifications

Technical specifications for the M22A indoor unit series.

M33C Indoor Unit Specifications

Technical specifications for the M33C indoor unit series.

M22A and M33C Indoor Unit Control Board Switches Location

M22A and M33C Condensate Drain Test Procedure

MMDB Ducted Indoor Units

MMDB Indoor Unit Specifications

Technical specifications for MMDB ducted indoor units.

Indoor Unit Blower Data

MMDB Condensate Drain Test Procedure

MWMC and 3WMC-036 Wall Mounted Indoor Units

Indoor Unit Specifications (009 - 012 Ton) Units

Technical specifications for MWMC units (009-012 Ton).

Indoor Unit Specifications (018 - 030 Ton) Units

Technical specifications for MWMC units (018-030 Ton).

MWMC and 3WMC036S4 Unit Control Board Switches Location

Dry Mode Operation - MWMC and 3WMC

Test Run - MWMC and 3WMC

Instructions for performing a test run on MWMC and 3WMC units.

MCFA and MCFB Ceiling / Floor Indoor Units

Indoor Unit Specifications (018 - 048 Ton) Units

Technical specifications for MCFA/MCFB units (018-048 Ton).

MCFA and MCFB Indoor Unit Control Board Switches Location

MFMA Floor Indoor Unit

Indoor Unit Specifications (012 Ton) Unit

Technical specifications for the MFMA012S4 indoor unit.

Power and Communication Wiring Requirements

Wiring Guide

Table detailing wiring requirements for single-zone mini-split systems.

Multi-Zone Installation Wiring Requirements

Table detailing wiring requirements for multi-zone systems.

Terminal Connections

Diagrams illustrating terminal connections for single and multi-zone systems.

Connection to Centralized Controller, ON/OFF and Alarm Devices

Set Indoor Unit Address for Centralized Control (Used with VRF Only)

Single and Multiple Zone Outdoor Units

MPC Single-Zone Specifications (0.75 - 1.5 Ton)

Technical specifications for MPC single-zone units (0.75-1.5 Ton).

MPC Single-Zone Specifications (2 - 4 Ton)

Technical specifications for MPC single-zone units (2-4 Ton).

MLB Single-Zone Specifications (0.75 - 2 Ton)

Technical specifications for MLB single-zone units (0.75-2 Ton).

Indoor / Outdoor Unit Combinations

MPC Multi-Zone System Combinations

MPC multi-zone system combinations for cooling and heating capacities.

MLB Multi-Zone System Combinations

MLB multi-zone system combinations for cooling and heating capacities.

Refrigeration Pipe Work

MPC and 3PC Single-Zone Refrigerant Cycle Diagram

MPC Three-Zone Refrigerant Cycle Diagram

Single-Zone Piping Limitations

Guidelines for single-zone piping length and elevation.

Multi-Zone Piping Limitations

Guidelines for multi-zone piping length and elevation.

Master Valves (3 to 5 Zone Outdoor Units)

Master Valves

MPC Multi-Zone Outdoor Unit Connections and Line Set Usage

Table 7. MPC018S4M

Table 8. MPC024S4M

Figure 31. MPC036S4M

Table 10. MPC048S4M

MLB Multi-Zone Outdoor Unit Connections and Line Set Usage

Table 11. MLB018S4M

Table 12. MLB030S4M

Table 13. MLB036S4M

Table 14. MLB048S4M

Power and Communication Wiring for Systems

Power and Communication Wiring for Systems

Safety precautions and overview for system power and communication wiring.

Outdoor Unit Condensate Piping

Condensate Drainage Requirement

MPC Condensate Pump Diagrams

MPC Condensate Pump Diagrams

Installation Requirements

Torque Requirements

Pipe Length and Elevation

Additional Refrigerant Charge

Calculation and guidelines for adding refrigerant based on pipe length.

Evacuation after Servicing the Outdoor Unit Refrigeration Circuit

Evacuation procedure for the complete refrigeration circuit.

Single-Zone Outdoor Unit LED Locations

Single-Zone Outdoor Unit LED Locations

Multi-Zone Outdoor Unit LEDs and SW1 Locations

Multi-Zone Outdoor Unit LEDs and SW1 Locations

Specifications and Operations

Main Protection

Indoor/Outdoor Units Communication Protection

Cooling Charts

Capacity Request Calculations

Defrost Control

For defrost calculations

Defrost Theory

Theory behind defrost mode activation and conditions.

Outdoor Fan Control

Electronic Expansion Valve (EXV) Control