Lennox MCA018S4S-1P

1
MINI-SPLIT SYSTEMS SERVICE MANUAL
MCA Series Unit Information
CORP1907-L5
11/2020
Supersedes 8/2019
Table of Contents
1. Indoor Units ................................................3
1.1. ModelNumberIdentication ................................... 3
1.2. IndoorUnitSpecications ....................................... 3
1.3. Indoor Unit Dimensions .......................................... 4
1.4. IndoorUnitClearances ........................................... 5
1.5. IndoorUnitWallMounts ......................................... 5
2. Indoor/Outdoor Matches ...........................6
3. Air Throw Data ...........................................6
4. Power and Communication Wiring for
Systems .....................................................7
4.1. Overview ................................................................. 7
4.2. WireGauge............................................................. 7
4.3. TerminalConnections ............................................. 8
5. Indoor Unit Diagrams ................................8
6. Wireless Remote ...................................... 10
6.1. Requirements ....................................................... 10
6.2. RemoteControlSpecications ............................. 10
6.3. FunctionButtons ................................................... 11
6.4. Display .................................................................. 12
6.5. Operations ............................................................ 12
6.5.1. Start/StopOperation.............................. 12
6.5.2. Select Fahrenheit or Celsius ............... 12
6.5.3. Cool/Fan mode ..................................... 12
6.5.4. DryMode ................................................ 12
6.5.5. TimerOperation ..................................... 12
6.5.6. TimerONOperation ............................... 12
6.5.7. TimerOFFOperation ............................. 13
6.5.8. ModifyTimerON/OFFsettings ............... 13
7. Connection to Centralized Controller ....13
7.1. SetIndoorUnitAddressforCentralizedControl
(UsedwithVRFOnly) ........................................... 13
7.2. IndoorUnitConnectionPointsforCentralized
Controller .............................................................. 14
7.3. DryModeOperation-IndoorUnits ....................... 14
7.3.1. Procedure ............................................... 14
7.3.2. DryModeOperationSequence .............. 14
7.4. TestRun-IndoorUnits ......................................... 14
7.4.1. TestRunInstructions .............................. 14
7.4.2. BeforeTestRun ...................................... 14
7.5. Double-CheckPipeConnections .......................... 15
7.6. AmbientTemperatureisBelow63°F(17°C) ......... 15
8. Single Zone Outdoor Units .....................16
8.1. ModelNumberIdentication ................................. 16
8.2. Specications........................................................ 16
8.3. CoolingCapacity................................................... 17
8.3.1. -009(208/230V) .................................... 17
8.3.2. -012(115V) ............................................ 18
8.3.3. -012(208/230V) .................................... 18
MCA Single Zone Air
Conditioning Outdoor Unit
MCWA Wall Mount Single Zone
Air Conditioning Indoor Unit
Please refer to Corp1908-L5 for indoor and outdoor unit error codes and component diagnostics.

Lennox MCA018S4S-1P Specifications

General

Brand	Lennox
Model	MCA018S4S-1P
Category	Air Conditioner
Language	English

Summary

1. Indoor Units

4. Power and Communication Wiring for Systems

4.2. Wire Gauge

4.3. Terminal Connections

Details electrical terminal connections for single zone wiring.

6. Wireless Remote

6.3. Function Buttons

Explains the functions of various buttons on the remote controller.

6.5. Operations

Details how to operate the indoor unit using the remote, covering start/stop, modes, fan, timers, etc.

7. Connection to Centralized Controller

7.1. Set Indoor Unit Address for Centralized Control

Explains how to set unique addresses for units connected to a centralized controller.

7.4. Test Run - Indoor Units

Provides instructions for performing a test run on indoor units.

7.5. Double-Check Pipe Connections

Emphasizes checking pipe connections during operation.

8. Single Zone Outdoor Units

8.2. Specifications

8.3. Cooling Capacity

Provides cooling capacity data for various indoor/outdoor temperatures.

8.5. Outdoor Unit Clearances

Specifies required clearances for outdoor unit installations.

9. Refrigeration Pipe Work

9.2. Single-Zone Piping Limitations

10. Outdoor Unit Connections and Line Set Usage

10.1. Pipe Length

10.2. Torque Requirements

13. Installation Requirements

13.1. Gas Leak Check with Soap Water

13.2. Air and Moisture

13.3. Air Purging using a Vacuum Pump

Provides steps for purging air from the system using a vacuum pump.

13.4. Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length

13.5. Add Refrigerant after Long-Term System Operation

13.6. Servicing Indoor Unit Refrigeration Circuit

13.7. Evacuation after Servicing the Outdoor Unit Refrigeration Circuit

13.7.2. Refrigerant Charging

17.3. Outdoor Fan Control

18. Indoor and Outdoor Unit Disassembly

18.1. Indoor Unit (All Models)

Provides instructions for disassembling all models of the indoor unit.

18.1.2. Electrical Parts

Guides on disassembling and handling electrical components of the indoor unit.

18.1.3. Evaporator

18.1.4. Fan Motor and Fan

18.2. Outdoor Unit

Covers the general disassembly of the outdoor unit.