Lennox MCB024S4S-1P - User Manual

INSTALLATION INSTRUCTION &
SERVICE INFORMATION
©
2021 Lennox Industries Inc.
Dallas, Texas, USA
WARNING
Improper installation, adjustment, alteration, ser vice
or maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li-
censed professional HVAC installer (or equivalent) or a
service agency.
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
General
Refer to the Product Specications bulletin (EHB) for
additional product information. These instructions are
intended as a general guide and do not supersede local or
national codes in any way. Authorities having jurisdiction
should be consulted before installation.
This wall-mounted indoor unit is matched with an outdoor
air conditioner unit to create a mini-split system that uses
HFC-410A refrigerant.
Use of Mini-Split System During
Construction
Lennox does not recommend the use of its mini-split
systems during any phase of construction. Very low return
air temperatures, harmful vapors and operation of the unit
with clogged or misplaced lters will damage the system.
However, mini-split systems may be used for cooling of
buildings under construction, if the following conditions
are met:
• Air lter must be installed in the system and must be
maintained during construction.
• Air lter must be replaced upon construction comple-
tion.
• The indoor wall unit assembly must be thoroughly
cleaned following nal construction clean-up.
• All mini-split operating conditions must be veried ac-
cording to these installation instructions.
MCB and MWCB Series Units
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
508241-01 12/2021
Table of Contents
General ..........................................................................1
Use of Mini-Split System During Construction ..........1
Included Parts ...............................................................2
Model Number Identication .......................................3
Typical System Components .......................................4
System Dimensions .....................................................4
Outdoor Units ..............................................................4
Indoor Units .................................................................5
Indoor Unit Wall Mounts ..............................................5
System Clearances.......................................................5
Outdoor Unit ................................................................5
Indoor Unit ...................................................................5
Multiple Outdoor Units .................................................6
Torque Requirements for Caps and Fasteners ..........6
Indoor Unit Installation ................................................6
Unit Placement Considerations ...................................6
Determining Wall Mounting Plate Location ..................7
Installation of Wall Mounting Plate...............................7
Installation of Wall Sleeve............................................7
Installation of Indoor Unit on Wall Mounting Plate .......8
Indoor Unit Condensate Piping Connections ...............8
Outdoor Unit Installation .............................................8
Placement Considerations ...........................................8
Direct Sunlight and Rain Protection .............................9
Buried Refrigerant Pipe Protection ..............................9
Securing the Outdoor Unit ...........................................9
Refrigerant Piping Connections ................................10
Adding Refrigerant for Longer Line Set ...................12
Leak Test and Evacuation ..........................................12
Leak Test ...................................................................12
Triple Evacuation Procedure......................................12
Wiring Connections ....................................................12
Outdoor Unit .............................................................13
Indoor Unit .................................................................13
Unit Start-Up ...............................................................14
Service Information ....................................................14
Indoor Unit Alert Codes and Outdoor Unit LED .........14
Test Run ....................................................................15
Double-Check Line Set Connections .........................15
Ambient Temperature is Below 60ºF (16ºC) ..............15
Indoor Unit Wiring Diagrams .....................................16
Outdoor Unit Wiring Diagrams ...................................17
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

Lennox MCB024S4S-1P Specifications

General

Refrigerant Type	R-410A
Voltage	208/230V
Sound Level (Outdoor Unit)	74 dB
Cooling Capacity	24, 000 BTU/h
Phase	Single
Dimensions (Outdoor Unit)	31" x 31"

Summary

Installation Instruction and Service Information

System Clearances

Outdoor Unit Clearances

Specifies required clearance dimensions around the outdoor unit for proper operation.

Indoor Unit Installation

Unit Placement Considerations

Wall Mounting Plate Installation

Mounting Indoor Unit

Indoor Unit Condensate Piping

Outdoor Unit Installation

Outdoor Unit Placement Considerations

Securing the Outdoor Unit

Slab or Roof Mounting

Securing Outdoor Unit to Brackets

Refrigerant Piping Connections

Making Refrigerant Line Connections

Leak Test and Evacuation

Triple Evacuation Procedure

Wiring Connections

Outdoor Unit Electrical Connections

Indoor Unit Electrical Connections

Service Information

Indoor Alert Codes and Outdoor LED

Lists error codes and LED indicators for troubleshooting indoor and outdoor units.

Unit Start-Up Procedure

Test Run Procedure

Double-Check Line Set Connections