Lennox MHA Series Manual
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Lennox MHA Series Manual

Single-zone mini-split system
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2019 Lennox Industries Inc.
©
Dallas, Texas, USA

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 (Wireless Remote Controller) ........................4
Requirements ..............................................................4
Remote Control Holder ...............................................4
Remote Control Specifications ....................................4
Function Buttons ..........................................................5
Display .........................................................................5
Operating Instruction ...................................................6
Troubleshooting ..............................................................7
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.
USER GUIDE
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
507928-01 6/2019
Supersedes 3/2019
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE

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
Cool or Dry Modes
Location
62°F - 90°F
Room
(17°C - 32°C)
5°F - 86°F
Outdoor
(-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.
MHA Series Units
Heat Mode
62°F - 90°F
(17°C - 32°C)
5°F - 86°F
(-15°C to 30°C)

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  • Page 1: Table Of Contents

    USER GUIDE MHA Series Units 2019 Lennox Industries Inc. © Dallas, Texas, USA SINGLE-ZONE MINI-SPLIT SYSTEM (115V and 208/230V) 507928-01 6/2019 Supersedes 3/2019 THIS MANUAL MUST BE LEFT WITH THE OWNER FOR FUTURE REFERENCE Optimal Performance Table of Contents Optimal performance for the COOL, HEAT and DRY modes can be achieved in the following temperature General ................1...

  • Page 2: Unit Parts

    Unit Parts Front Panel Wireless Wireless Remote Control Remote Control Holder Louver ON/OFF SILENCE Return Air Filters (2) TIMER MODE TEMP TIMER SLEEP SWING DIRECT TURBO SELF FOLLOW CLEAN Display window “ ” for 3 seconds when: • TIMER ON is set •...

  • Page 3: Features

    Features Return Air Filters Blocked or dirty return air filters affect system oper ation and Auto Restart efficiency. Air filters should be checked monthly in order to If the unit loses power, it will automatically restart with the ensure proper air flow to the in door unit. It may be necessary prior settings once power has been restored.

  • Page 4: Air Filter Reminders

    Air Filter Reminders 3. Press the MANUAL CONTROL button to activate FORCED AUTO mode. Both FORCE HEATING and Table 2. Air Filter Reminders COOLING is preset to 75ºF (24ºC) and cannot be After 240 hours of use, the display manually adjusted. window on the indoor unit will flash “CL.”...

  • Page 5: Function Buttons

    Function Buttons Frost Prevention Mode • Up arrow button. Press to increase the temperature • FP button. Press and hold for two seconds to acti- setpoint or to scroll through settings options. vate frost prevention mode. In heating mode only, the •...

  • Page 6: Operating Instruction

    • Transmitting display. Icon blinks once when a signal WARNING is sent from the wireless remote controller. • Operation mode. These icons show the current mode Do not mix old and new batteries or batteries of different of operation. Press the mode button to scroll through types.

  • Page 7: Troubleshooting

    Timer Operation Troubleshooting Timer ON and Timer OFF are used to turn on and turn off If any of the following faults codes appear on your indoor the indoor unit at selected intervals. unit, please contact your li censed professional HVAC Timer ON Operation installer (or equivalent) or a service agency.

  • Page 8: Fcc Compliance Statement - Part 15.19

    FCC Compliance Statement — PART 15.19 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. This device must accept any interference received, including interference that may cause undesired operation.

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