Lennox MCB012S4S-1L - 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 MCB012S4S-1L Specifications

General

Brand	Lennox
Model	MCB012S4S-1L
Category	Air Conditioner
Language	English

Summary

General System Overview

Installation Clearances

Indoor Unit Wall Mounts

Indoor Unit Installation

Mounting Plate Installation

Unit Mounting on Plate

Condensate Piping

Connecting the drain line for condensate removal from the indoor unit.

Outdoor Unit Installation

Pipe Protection and Securing

Refrigerant Piping Connections

Pipe Preparation

Making Connections

Steps for connecting refrigerant lines to the indoor and outdoor units.

Flare Nut Tightening

Leak Test and Evacuation

Leak Testing

Steps to test the system for refrigerant leaks using nitrogen.

Evacuation Procedure

Procedure to remove air and moisture from the refrigerant system.

Adding Refrigerant

Wiring Connections

Outdoor Unit Wiring

Electrical power wiring connections for the outdoor unit.

Indoor Unit Wiring

Communication, power, and ground wiring for the indoor unit.

Service and Start-Up

Error Codes and LEDs

Table of error codes and LED indicators for system diagnostics.

Pre-Start Up Checks

Start-Up Procedure

Step-by-step guide to safely start up the mini-split system.

Test Run and Operation

Test Run Pre-Checks

Safety and system checks required before performing a test run.

Test Run Procedure

Steps to run the system and verify its operation.