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 Specifications
....................................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 filters.
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.
