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.

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.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Wireless Remote Controller Operation
5. Manual Operation (Forced Cooling Mode)
6. Optimal Performance Tips
7. Maintenance Features
8. Return Air Filters
9. Remote Controller Batteries
10. Troubleshooting
11. Safety Warnings

This document provides a user guide for Lennox MHA Series single-zone mini-split systems, which are heat pump units available in 115V and 208/230V configurations. These systems utilize HFC-410A refrigerant.

Function Description

The Lennox MHA Series mini-split system is designed to provide cooling, heating, and dry modes for single-zone applications. The system consists of an indoor wall-mounted unit and an outdoor heat pump unit. Operation is primarily controlled via a wireless remote controller, with a manual control button available on the indoor unit for emergency use.

The system offers several operational features to enhance user comfort and efficiency:

• Auto Restart: In the event of a power loss, the unit will automatically restart with its previous settings once power is restored.
• Anti-Mildew: When the unit is turned off from COOL or DRY modes, the heat pump will continue to operate at very low power to dry up condensed water, preventing mildew growth.
• Louver Angle Memory: The louver will automatically resume its former angle operation when the unit is turned on.
• Refrigerant Leakage Detection: The indoor unit will display "EC" if it detects refrigerant leakage, indicating a potential issue.
• Louver Adjustment: Louvers can be set to automatically swing up and down or remain stationary in a single position using the remote controller. For cooling, it is recommended to direct horizontal discharge air louvers outward.
• Frost Prevention Mode (FP): In heating mode, the unit can be set to operate at a 46°F (8°C) set point to prevent frost.
• Timer ON/OFF: Users can set the unit to automatically turn on or off at selected intervals.
• Sleep Mode: Activates "night-mode," which automatically adjusts the set point by 2°F (1°C) per hour for the first two hours, maintaining the modified set point for five hours before turning off.
• Turbo Mode: Quickly ramps up the indoor unit to reach the set point faster in both heating and cooling modes.
• Self Clean Mode: In cooling or dry mode, the indoor unit temporarily changes operation to evaporate condensate on the coil, then returns to previous conditions.
• Silence Button: Activates quiet mode operation for reduced sound, though this may impact cooling or heating capacity.
• Follow Me Function: Transfers the temperature sensing function from the indoor unit to the wireless remote controller, allowing the unit to regulate room temperature based on the remote controller's location.

Important Technical Specifications

• Optimal Performance Ranges:
  • Cool or Dry Modes:
    • Room: 62°F - 90°F (17°C - 32°C)
    • Outdoor: 5°F - 86°F (-15°C to 30°C)
  • Heat Mode:
    • Room: 62°F - 90°F (17°C - 32°C)
    • Outdoor: 5°F - 86°F (-15°C to 30°C)
• Remote Control Specifications:
  • Rated Voltage: 3.0 VDC (2 AAA batteries)
  • Min Voltage for Sending Signal to CPU: 2.4 VDC
  • Effective Transmitting Distance: 26 feet (8 meters)
  • Operation Conditions: 23°F to 140°F (-5 to 60°C)
• Refrigerant: HFC-410A

Usage Features

The system can be operated using the wireless remote controller or, in an emergency, via a manual control button on the indoor unit.

Wireless Remote Controller Operation:

• Power: On/Off button to turn the system on or off.
• Mode Selection: Cycle through Auto, Cool, Dry, Heat, and Fan modes.
• Temperature Adjustment: Up and Down arrow buttons to increase or decrease the temperature setpoint.
• Fan Speed: Cycle through Auto, Low, Med, and High fan speeds.
• Louver Control: Swing button for automatic oscillation, Direct button for 6-degree increment adjustments.
• LED Button: Turns the indoor unit display on or off.
• Timer Functions: Set Timer ON and Timer OFF for delayed operation.
• Special Modes: Buttons for Sleep, Turbo, Self Clean, Silence, FP (Frost Prevention), and Follow Me.

Manual Operation (Forced Cooling Mode):

• Located on the right-hand side of the indoor unit, under the front panel.
• Press once for FORCED AUTO mode (preset to 75°F/24°C).
• Press a second time for FORCED COOLING mode (preset to 75°F/24°C).
• Press a third time for FORCED HEATING mode (preset to 75°F/24°C).
• Press again to turn the unit off.
• Note: Manual operation is not a long-term solution, and set points cannot be manually adjusted in this mode.

Optimal Performance Tips:

• Keep doors and windows closed.
• Utilize TIMER ON and TIMER OFF functions to limit energy usage.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.

Maintenance Features

Return Air Filters:

• Inspection: Check monthly, or more frequently in dusty environments, to ensure proper airflow.
• Cleaning:
  1. Lift the front panel of the indoor unit.
  2. Grip the tab on the filter, lift it up, and pull it towards you.
  3. Pull the filter out.
  4. Clean with warm soapy water and mild detergent.
  5. Rinse with fresh water and shake off excess.
  6. Dry in a cool, dry place away from direct sunlight.
  7. Slide filters back into the unit and close the front panel.
• Reminders:
  • Cleaning Reminder ("CL"): Flashes after 240 hours of use. Reset by pressing the LED button 4 times or the MANUAL CONTROL button 3 times.
  • Replacement Reminder ("nF"): Flashes after 2,880 hours of use. Reset by pressing the LED button 4 times or the MANUAL CONTROL button 3 times.

Remote Controller Batteries:

• Replace batteries when completely discharged or when the battery charge status icon indicates low power.
• Do not mix old and new batteries or different types.
• Remove batteries if the controller will not be used for an extended period.
• Dispose of used batteries according to local and state waste management standards.

Troubleshooting:

• The indoor unit display may show fault codes (e.g., E0, E1, E3, EC, F0, P0) indicating various system errors. If a fault code appears, contact a licensed professional HVAC installer or service agency.

Safety Warnings:

• Electrical Shock, Fire, or Explosion Hazard: Do not spray water on the indoor unit, touch the unit or controller with wet hands, or insert hands/tools into air intake/outlet. Do not remove the outdoor unit fan guard.
• Caution: If the outdoor unit is on a raised stand, check its stability. Do not install sprinklers or soaker hoses that expose the outdoor unit to treated water, as this can corrode parts and diminish performance.
• Important: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Installation and service must be performed by a licensed professional HVAC installer or service agency.

Lennox MHA Series Specifications