Lennox MCB Series Service Manual

Please refer to 100042 for indoor and outdoor unit error codes and component diagnostics.
MWCB / MWHB Wall Mount Single-Zone

Table of Contents

1. Indoor Units ............................................................. 2
1.1. Model Number Identification ............................................. 2
1.2. Indoor Unit Specifications ................................................. 2
1.3. Indoor Unit Dimensions (All Models) ................................. 4
1.4. Indoor Unit Clearances (All Models) ................................. 4
1.5. Indoor Unit Wall Mounts (All Models) ................................ 5
2. Indoor/Outdoor Matches ......................................... 5
3. Connection to Centralized Controller .................... 6
3.1. Set Indoor Unit Address for Centralized Control
(Used with VRF Only) ....................................................... 6
3.2. Indoor Unit Connection Points for Centralized
Controller ...........................................................................6
4. Outdoor Units .......................................................... 7
4.1. Model Number Identification ............................................. 7
4.2. Specifications .................................................................... 7
4.3. MCB Cooling Capacity ...................................................... 9
4.3.1. - 009 (208/230V) ............................................... 9
4.3.2. - 012 (115V) .................................................... 10
4.3.3. - 012 (208/230V) ............................................. 10
4.3.4. - 018 (208/230V) ............................................. 11
4.3.5. - 024 (208/230V) ............................................. 11
4.4. MHB Cooling Capacity .................................................... 12
4.4.1. - 009 (115V) .................................................... 12
4.4.2. - 009 (208/230V) ............................................. 12
4.4.3. - 012 (115V) .................................................... 13
4.4.4. - 012 (208/230V) ............................................. 13
4.4.5. - 018 (208/230V) ............................................. 14
4.4.6. - 024 (208/230V) ............................................. 14
4.5. MHB Heating Capacity .................................................... 15
MINI-SPLIT SYSTEMS SERVICE MANUAL
Indoor Unit
MCB/MWCB and MHB/MWHB
Series Unit Information
MCB / MHB Single-Zone
Outdoor Units
4.5.1. - 009 (115V) .................................................... 15
4.5.2. - 009 (208/230V) ............................................. 15
4.5.3. - 012 (115V) .................................................... 15
4.5.4. - 012 (208/230V) ............................................. 15
4.5.5. - 018 (208/230V) ............................................. 16
4.5.6. - 024 (208/230V) ............................................. 16
4.6. Outdoor Unit Dimensions (MCB and MHB) ..................... 17
4.7. Outdoor Unit Clearances ................................................. 17
4.7.1. Single Units ..................................................... 17
4.7.2. Multiple Units .................................................. 18
5. Refrigeration Pipe Work........................................ 19
5.1. Single-Zone Refrigerant Cycle Diagram ......................... 19
5.2. Single-Zone Piping Limitations ........................................ 19
5.3. Add Refrigerant after Long-Term System Operation ....... 20
5.4. Servicing Indoor Unit Refrigeration Circuit ...................... 20
5.4.1. Collecting Refrigerant into Outdoor Unit ......... 20
5.4.2. Air Purging with Vacuum Pump ...................... 20
5.5. Evacuation after Servicing the Outdoor Unit
Refrigeration Circuit ........................................................ 21
5.5.1. Evacuation of the Complete Refrigeration
Circuit (Indoor and Outdoor Units) .................. 21
5.5.2. Refrigerant Charging ....................................... 21
5.6. Cooling Chart ..................................................................22
5.7. Capacity Request Calculations ....................................... 22
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100041 5/2022