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Step 4. Removethescrewssecuringthefanmotorto

body.Thenremovefanmotor.

17.2.8. Fan Disassembly (MWHA024S4)

Step 1. Removethenutsecuritythefanwithaspanner.

Thenremovethefan.

D Cut

Step 2. Releasethehooksandthenopentheelectronic

controlboxcover.

Hook

Step 3. Disconnecttheconnectorforthefanmotorfrom

theelectroniccontrolboard.

Fan Motor Connector

Step 4. Removethescrewssecuringthefanmotorfrom

body.Removethefan.

Fan Motor

Table of Contents1
Indoor Units3
Model Number Identification3
Indoor Unit Specifications3
Indoor Unit Dimensions4
Indoor Unit Clearances4
Indoor Unit Wall Mounts5
Indoor/Outdoor Matches5
Air Throw Data6
Power and Communication Wiring for Systems7
Overview7
Wire Gauge7
Terminal Connections8
Indoor Unit Diagrams8
Wireless Remote9
Requirements9
Remote Control Specifications9
Connection to Centralized Controller11
Set Indoor Unit Address for Centralized Control (Used with VRF Only)11
Indoor Unit Connection Points for Centralized12
Controller12
Dry Mode Operation - Indoor Units12
Procedure12
Dry Mode Operation Sequence13
Test Run - Indoor Units13
Test Run Instructions13
Before Test Run13
Double-Check Pipe Connections13
Ambient Temperature Is Below 63°F (17°C)13
Single Zone Outdoor Units15
Model Number Identification15
Specifications15
Cooling And Heating Capacities16
Cooling - 009 (115V)16
Heating - 009 (115V)17
Cooling - 009 (208/230V)17
Heating - 009 (208/230V)18
Cooling - 012 (115V)18
Heating - 012 (115V)19
Cooling - 012 (208/230V)19
Heating - 012 (208/230V)20
Cooling - 018 (208/230V)20
Heating - 018 (208/230V)21
Cooling - 024 (208/230V)21
Heating - 024 (208/230V)22
Unit Dimensions22
Outdoor Unit Clearances23
Single Units23
Multiple Units24
Refrigeration Pipe Work25
Single-Zone Refrigerant Cycle Diagram25
Single-Zone Piping Limitations25
Outdoor Unit Connections and Line Set Usage26
Pipe Length26
Torque Requirements26
Power and Communication Wiring for Systems27
Outdoor Unit Diagrams28
Installation Requirements29
Gas Leak Check With Soap Water30
Air And Moisture30
Air Purging Using A Vacuum Pump30
Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length30
Add Refrigerant after Long-Term System Operation30
Servicing Indoor Unit Refrigeration Circuit31
Collecting Refrigerant Into Outdoor Unit31
Air Purging With Vacuum Pump31
Evacuation after Servicing the Outdoor Unit Refrigeration Circuit31
Evacuation of the Complete Refrigeration Circuit, Indoor and Outdoor Unit31
Refrigerant Charging31
Electronic Function32
Abbreviation32
Electric Control Working Environment32
Adding Refrigerant - Single-Zone Systems32
Single-Zone Outdoor Unit LED Locations32
Specifications And Operations33
Cooling Chart34
Heating Chart34
Capacity Request Calculations35
Outdoor Fan Control36
Cooling Mode36
Indoor and Outdoor Unit Disassembly37
Indoor Unit (All Models)37
Front Panel37
Electrical Parts39
Evaporator41
Fan Motor And Fan42
Step Motor42
Drain Hose43
Outdoor Unit43
Panel Plate (Some Models)43
Panel Plate (Mwha024S4)44
Electronic Components (MWHA009S4 and MWHA012S4)45
Electronic Components (Mwha018S4)46
Electronic Components (Mwha024S4)46
Fan Disassembly (MWHA009S4 and MWHA012S4)46
Fan Disassembly (Mwha018S4)47
Fan Disassembly (Mwha024S4)48
Sound Blanket49
Four-Way Valve49
Compressor49

Brand	Lennox
Model	MHA Series
Category	Air Conditioner
Language	English

Lennox MHA Series Service Manual

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