Lennox MCA Series

USER GUIDE
©
2019 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.
General
This wall-mounted indoor unit is matched with an outdoor
air conditioner unit to create a mini-split system that uses
HFC-410A refrigerant.
Optimal Performance
Optimal performance for the COOL and DRY modes can
be achieved in the following temperature ranges. When
your air conditioner is used outside of these ranges,
certain safety protection features will activate and cause
the unit to perform less than optimally.
Table 1. Cool and Dry Mode Optimal
Performance Ranges
Temperature
Location
Cool Mode Dry Mode
Room
63°F - 90°F
(17°C - 32°C)
50°F - 90°F
(10°C - 32°C)
Outdoor
5°F - 122°F
(-15°C - 50°C)
32°F - 122°F
(0°C - 50°C)
To further optimize the performance of your unit, do the
following:
• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER
OFF functions.
• Do not block air inlets or outlets.
• Regularly inspect and clean air lters.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
MCA Series Units
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
507880-01 6/2019
Supersedes 11/2018
Table of Contents
General ...........................................................................1
Optimal Performance......................................................1
Unit Parts ........................................................................2
Features .........................................................................3
Auto Restart .................................................................3
Anti-Mildew ..................................................................3
Louver Angle Memory ..................................................3
Refrigerant Leakage Detection ....................................3
Louver Adjustment ..........................................................3
Return Air Filters .............................................................3
Cleaning Return Air Filters ...........................................3
Air Filter Reminders .....................................................4
Operation (Manual) - Force Cooling Mode .....................4
Operation (Wireless Remote Controller) ........................4
Requirements ..............................................................4
Remote Control Specications ....................................4
Function Buttons ..........................................................6
Display .........................................................................6
Operations ...................................................................6
Troubleshooting ..............................................................7
FCC Compliance Statement — PART 15.19 ..................8
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

Lennox MCA Series Specifications

General

Sound Level	As low as 69 dB
Refrigerant	R-410A
Cooling Capacity	1.5 - 5 tons
Voltage	208-230V
Warranty	10-Year Limited Warranty on compressor, 5-Year Limited Warranty on covered components. May require online registration.

Summary

Optimal Performance

Unit Parts

Features

Auto Restart

Unit restarts with prior settings after power loss.

Refrigerant Leakage Detection

Unit displays "EC" when refrigerant leakage is detected.

Louver Adjustment

Louvers are adjustable only via remote controller.

Return Air Filters

Cleaning Return Air Filters

Instructions for removing and cleaning air filters.

Operation (Manual) - Force Cooling Mode

Operation (Wireless Remote Controller)

Requirements

Points for using the remote controller effectively.

Remote Controller Function Buttons

Remote Controller Display

Function Buttons

Timer ON button

Timer OFF button

Follow (Follow Me) button

Uses remote's sensor for temperature regulation.

Operations

StartStop Operation

Select Fahrenheit or Celsius

To Set the Operation Mode

Troubleshooting

Faults Codes Displayed on Indoor Unit

Table of error codes and their descriptions for indoor units.

Timer Operation

Timer ON Operation

Sets the time for the indoor unit to begin operation.

Timer OFF Operation

Sets the time for the indoor unit to stop operation.

Modify Timer ONOFF settings