Lennox MHA Series User Manual

USER GUIDE
©
2019 Lennox Industries Inc.
Dallas, Texas, USA
MHA Series Units
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
507928-01 6/2019
Supersedes 3/2019
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) - Forced Cooling Mode ...................4
Operation (Wireless Remote Controller) ........................4
Requirements ..............................................................4
Remote Control Holder ...............................................4
Remote Control Specications ....................................4
Function Buttons ..........................................................5
Display .........................................................................5
Operating Instruction ...................................................6
Troubleshooting ..............................................................7
FCC Compliance Statement — PART 15.19 ..................8
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
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
heat pump unit to create a mini-split system that uses
HFC-410A refrigerant.
Optimal Performance
Optimal performance for the COOL, HEAT and DRY
modes can be achieved in the following temperature
ranges. When your heat pump is used outside of these
ranges, certain safety protection features will activate and
cause the unit to perform less than optimally.
Table 1. Cool, Heat and Dry Mode Optimal
Performance Ranges
Temp
Location
Cool or Dry Modes Heat Mode
Room
62°F - 90°F
(17°C - 32°C)
62°F - 90°F
(17°C - 32°C)
Outdoor
5°F - 86°F
(-15°C to 30°C)
5°F - 86°F
(-15°C to 30°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.

Lennox MHA Series Specifications

General

Brand	Lennox
Model	MHA Series
Category	Air Conditioner
Language	English

Summary

General Information and Optimal Performance

General Unit Description

Describes the wall-mounted indoor unit matched with an outdoor heat pump unit for a mini-split system.

Optimal Performance Ranges

Details the recommended temperature ranges for optimal COOL, HEAT, and DRY modes to ensure proper operation.

Unit Components and Parts

Unit Parts Identification

Identifies the main physical components of the indoor unit, including the front panel, louvers, and display.

Unit Features and Maintenance

Key Unit Features

Details features like Auto Restart, Anti-Mildew, Louver Angle Memory, and Refrigerant Leakage Detection.

Return Air Filters

Explains the importance of air filters, how to clean them, and their impact on system efficiency.

Operation and Controls

Air Filter Reminders

Informs about reminders for cleaning ('CL') and replacement ('nF') of air filters.

Manual Operation Mode

Instructions for operating the unit manually using the control button on the indoor unit.

Wireless Remote Controller

Details requirements and specifications for using the wireless remote control.

Remote Control Functions and Display

Function Buttons Overview

Explains the purpose and operation of various buttons on the remote control.

Frost Prevention Mode

Details how to activate and deactivate frost prevention mode during heating.

Follow Me Feature

Enables the remote control's sensor for temperature monitoring.

Remote Display Icons

Describes the meaning of various icons displayed on the remote controller.

System Settings and Modes

Battery Installation

Instructions for installing batteries in the remote controller.

Temperature Unit Selection

Guide to toggle between Fahrenheit and Celsius temperature displays.

Operation Mode Selection

Details on selecting and operating Auto, Cool, Dry, Heat, and Fan modes.

Timer Operation and Troubleshooting

Timer ON/OFF Operation

Instructions for setting the indoor unit to turn on or off at selected intervals.

Troubleshooting Fault Codes

Lists and explains fault codes displayed on the indoor unit and actions to take.

Compliance Information

FCC Compliance Statement

States compliance with FCC Rules Part 15 regarding radio frequency interference.