Lennox MWHA012S4-1P - User Manual

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
MHA Series Unit Information
CORP1913-L8
11/2020
Table of Contents
1. Indoor Units ................................................3
1.1. ModelNumberIdentication ..................................... 3
1.2. IndoorUnitSpecications ......................................... 3
1.3. IndoorUnitDimensions ............................................4
1.4. IndoorUnitClearances ............................................. 4
1.5. IndoorUnitWallMounts ...........................................5
1.6. Indoor/OutdoorMatches ........................................... 5
2. Air Throw Data ...........................................6
3. Power and Communication Wiring for
Systems .....................................................7
3.1. Overview ...................................................................7
3.2. WireGauge...............................................................7
3.3. TerminalConnections ...............................................8
4. Indoor Unit Diagrams ................................8
5. Wireless Remote ........................................ 9
5.1. Requirements ...........................................................9
5.2. RemoteControlSpecications .................................9
6. Connection to Centralized Controller .... 11
6.1. SetIndoorUnitAddressforCentralizedControl(Used
withVRFOnly) ........................................................ 11
6.2. IndoorUnitConnectionPointsforCentralized
Controller ................................................................12
6.3. DryModeOperation-IndoorUnits .........................12
6.3.1. Procedure .................................................12
6.3.2. DryModeOperationSequence ................13
6.4. TestRun-IndoorUnits ........................................... 13
6.4.1. TestRunInstructions ................................13
6.4.2. BeforeTestRun ........................................13
6.5. Double-CheckPipeConnections ............................13
6.6. AmbientTemperatureisBelow63°F(17°C) ........... 13
7. Single Zone Outdoor Units .....................15
7.1. ModelNumberIdentication ................................... 15
7.2. Specications..........................................................15
7.3. CoolingandHeatingCapacities .............................16
7.3.1. Cooling-009(115V) ................................16
7.3.2. Heating-009(115V) ................................17
7.3.3. Cooling-009(208/230V) .........................17
7.3.4. Heating-009(208/230V) ......................... 18
7.3.5. Cooling-012(115V) ................................18
7.3.6. Heating-012(115V) ................................19
7.3.7. Cooling-012(208/230V) .........................19
7.3.8. Heating-012(208/230V) ......................... 20
7.3.9. Cooling-018(208/230V) .........................20
7.3.10. Heating-018(208/230V) ......................... 21
7.3.11. Cooling-024(208/230V) .........................21
7.3.12. Heating-024(208/230V) ......................... 22
MHA Single Zone Air
Conditioning Outdoor Unit
MWHA Wall Mount Single Zone
Air Conditioning Indoor Unit
Please refer to Corp1914-L8 for indoor and outdoor unit error codes and component diagnostics.

Lennox MWHA012S4-1P Specifications

General

Voltage	208/230V
Phase	1
Refrigerant	R-410A
Cooling Capacity	12000 BTU/h
SEER Rating	20

Summary

Indoor Units

Indoor Unit Specifications

Provides detailed technical specifications for indoor units.

Indoor Unit Clearances

Indoor;Outdoor Matches

Lists compatible indoor and outdoor unit pairings and ratings.

Power and Communication Wiring

Wire Gauge Requirements

Specifies required wire gauges and MCA for wiring connections.

Terminal Connections

Wireless Remote Control

Centralized Controller Connection

Setting Indoor Unit Address

How to set unique addresses for indoor units in centralized control.

Indoor Unit Connection Points

Test Run Procedures

Test Run Instructions

Step-by-step instructions for performing a test run.

Pre-Test Run Checklist

Pipe Connection Checks

Single Zone Outdoor Units

Model Number Identification

Explains how to identify the model number of outdoor units.

Outdoor Unit Specifications

Lists technical specifications for single zone outdoor units.

Cooling and Heating Capacities

Provides cooling and heating capacity data for various models.

Cooling - 009 (115 V)

Cooling capacity table for 009 (115V) model.

Heating - 009 (115 V)

Heating capacity table for 009 (115V) model.

Cooling - 009 (208;230 V)

Cooling capacity table for 009 (208/230V) model.

Cooling - 012 (115 V)

Cooling capacity table for 012 (115V) model.

Heating - 012 (115 V)

Heating capacity table for 012 (115V) model.

Cooling - 012 (208;230 V)

Cooling capacity table for 012 (208/230V) model.

Heating - 012 (208;230 V)

Heating capacity table for 012 (208/230V) model.

Cooling - 018 (208;230 V)

Cooling capacity table for 018 (208/230V) model.

Heating - 018 (208;230 V)

Heating capacity table for 018 (208/230V) model.

Cooling - 024 (208;230 V)

Cooling capacity table for 024 (208/230V) model.

Heating - 024 (208;230 V)

Heating capacity table for 024 (208/230V) model.

Single Unit Clearances

Multiple Outdoor Unit Clearances

Refrigeration Pipe Work

Single-Zone Refrigerant Cycle Diagram

Single-Zone Piping Limitations

Outdoor Unit Connections and Line Set Usage

Pipe Length Guidelines

Torque Requirements

Outdoor Unit Diagrams

9 K, 12 K (115 VAC) Wiring Diagram

09 K, 12 K, 18 K (208;230 VAC) Wiring Diagram

Installation Requirements

Gas Leak Check with Soap Water

Air and Moisture Control

Vacuum Pump Purging

Refrigerant Charging Guidelines

Refrigeration Circuit Servicing

Refrigerant Circuit Evacuation & Charging

Steps for evacuating and charging refrigerant into the system.

Specifications and Operations

Protection Tables

Performance Charts

Provides cooling and heating performance data across various temperatures.

Capacity Calculation

Unit Disassembly

Indoor Unit Disassembly

Electrical Parts Access

Evaporator Removal

Fan Motor and Fan Removal

Outdoor Unit Electronic Components

Outdoor Unit Fan Disassembly

Four-Way Valve Disassembly

Compressor Removal