Lennox MWHA009S4, Service Manual

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MINI-SPLIT SYSTEMS SERVICE MANUAL
MHA Series Unit Information
CORP1913-L8
11/2020
Table of Contents
1. Indoor Units ................................................3
1.1. Model Number Identification .....................................3
1.2. Indoor Unit Specifications .........................................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 Specifications .................................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 Identification ...................................15
7.2. Specifications ..........................................................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.