American Standard HVAC Mitsubishi Electric NAXSKS24A112A Series Manual

The American Standard HVAC Mitsubishi Electric NAXSKS24A112A Series is a high-efficiency, ductless mini-split heat pump system designed for residential and light commercial applications. This system features inverter-driven compressor technology, multiple indoor unit compatibility, quiet operation, and advanced climate control capabilities. Below are key sections covering safety, features, installation, setup, operation, maintenance, and troubleshooting for this HVAC series.

1. Features at a Glance 2. Installation Guidelines 3. First-Time Setup & Commissioning 4. Technical Specifications 5. Controls and Settings 6. Connecting System Components 7. Operating Modes & Functions 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting Guide

Features at a Glance

Key components: Outdoor unit (condenser), Indoor unit(s) (evaporator), Remote controller, Refrigerant piping, Communication/power cables.

Feature	Description
Inverter Technology	Variable-speed compressor for precise temperature control and energy efficiency
Multiple Indoor Unit Support	Compatible with various indoor unit types (wall-mounted, ceiling cassette, ducted)
Quiet Operation	Low noise levels for both indoor and outdoor units
Wide Operating Range	Heating capability down to low outdoor temperatures
Advanced Filtration	Multi-stage air filtration system
Wi-Fi Ready	Optional connectivity for smart thermostat integration
Auto Swing Louvers	Automatic air flow direction adjustment
Self-Diagnosis	LED indicators and error codes for system status
Eco Mode	Energy-saving operation setting
Follow Me Function	Remote control with temperature sensing capability

Installation Guidelines

Unpack and inspect all components. Ensure proper location selection for optimal performance.

Outdoor Unit Placement: Install on stable, level surface with adequate clearance for airflow and service access.
Indoor Unit Mounting: Secure to wall or ceiling according to mounting template, ensuring level installation.
Refrigerant Piping: Connect using flare fittings; perform proper evacuation and charging procedures.
Electrical Connections: Connect power and communication cables following local electrical codes.
Drain Line Installation: Route condensate drain line with proper slope away from the unit.

WARNING! Installation must be performed by qualified HVAC technicians only. Improper installation can cause injury, property damage, or system failure.

First-Time Setup & Commissioning

Power on system; perform initial setup and system check.

Power Up: Turn on circuit breaker; outdoor unit should initialize with indicator lights.
Remote Control Setup: Install batteries; pair with indoor unit if required.
Test Operation: Run system in cooling and heating modes to verify proper function.
System Settings: Configure temperature units, fan speeds, and operational preferences.
Commissioning Check: Verify refrigerant charge, airflow, and drainage operation.

CAUTION! Do not operate system without proper refrigerant charge. Ensure all electrical connections are secure before powering on.

Technical Specifications

Model Series: NAXSKS24A112A
System Type: Ductless Mini-Split Heat Pump
Cooling Capacity: 24,000 BTU/H (2-ton equivalent)
Heating Capacity: 26,000 BTU/H at 47°F outdoor temperature
Power Requirements: 208-230V, 60Hz, 1-phase
Refrigerant: R-410A
Maximum Piping Length: Up to 82 feet (with proper sizing)
Indoor Unit Noise Level: As low as 19 dB(A)
Outdoor Unit Noise Level: As low as 50 dB(A)
SEER Rating: Up to 20.5
HSPF Rating: Up to 10.0
Operating Temperature Range: Cooling: 14°F to 115°F; Heating: -13°F to 75°F outdoor temperature

Controls and Settings

Access controls via remote controller or optional wall-mounted thermostat.

Remote Controller: POWER, MODE (Auto/Cool/Heat/Dry/Fan), TEMPERATURE ▲/▼, FAN SPEED, TIMER, SWING, ECO, SLEEP, FILTER RESET.

Basic Settings: Temperature setpoint, Operation mode selection, Fan speed (Auto/Low/Medium/High), Louver direction (manual or auto swing). Advanced Settings: Timer programming (on/off schedules), Follow Me function activation, Eco mode settings, Filter reset indicator, Self-cleaning operation (if equipped).

Connecting System Components

Proper connection between outdoor unit, indoor unit(s), and controls is critical for system operation.

Turn off all power before making any connections.
Connect refrigerant piping using proper flaring tools and torque specifications.
Run communication cable between outdoor and indoor units in separate conduit from power lines.
Connect power wiring to designated terminals following wiring diagram.
Install drain line with continuous downward slope (minimum 1/4" per foot).

Tip: Label all wires during installation for easier future service. Use only copper piping approved for R-410A refrigerant.

Operating Modes & Functions

System supports multiple operating modes for year-round comfort.

Cooling Mode: Press MODE until snowflake icon appears; set desired temperature.
Heating Mode: Press MODE until sun icon appears; set desired temperature.
Dry Mode: Dehumidification without significant cooling; ideal for humid conditions.
Fan Only: Circulates air without heating or cooling.
Auto Mode: System automatically selects heating or cooling based on room temperature.
Timer Function: Program unit to turn on/off at specific times.
Swing Function: Adjust vertical/horizontal air flow direction.
Sleep Mode: Gradually adjusts temperature for comfortable sleeping.
Eco Mode: Optimizes operation for energy savings.
Quick Start: Rapidly reaches set temperature when first turned on.

WARNING! Do not switch between heating and cooling modes rapidly. Allow system to complete cycle before changing modes.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

Air Filter Cleaning: Remove and clean filters every 2-4 weeks during operation.
Indoor Unit Cleaning: Wipe exterior with soft, damp cloth; clean condensate drain pan.
Outdoor Unit Maintenance: Keep area clear of debris; clean coil annually.
System Inspection: Check refrigerant lines, electrical connections, and mounting annually.
Professional Service: Schedule annual maintenance by qualified technician.

Care & Cleaning

Turn off power before cleaning any components. Use only mild detergent and water; do not use abrasive cleaners.

CAUTION! Do not use water pressure washer on outdoor unit. Do not bend aluminum fins on coils. Keep electrical components dry during cleaning.

Regulatory Information

This equipment complies with FCC Part 15 regulations for Class B digital devices. UL listed for safety. EPA refrigerant handling certification required for service. Manufactured to meet AHRI performance standards. For support, contact American Standard Customer Service at 1-800-937-1900 or visit www.americanstandardair.com. Mitsubishi Electric is a registered trademark.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Unit not turning on	Power supply issues	Check circuit breaker; verify power at outlet; ensure remote has batteries.
Poor cooling/heating	Dirty filters/coils	Clean air filters; ensure outdoor unit is unobstructed; check temperature setting.
Water leakage	Clogged drain line	Clear condensate drain line; ensure proper slope.
Unusual noises	Loose parts or debris	Check for loose panels; remove debris from fan; ensure unit is level.
Error codes displayed	System fault	Refer to error code chart in manual; note code and contact service if needed.
Remote not working	Batteries/obstructions	Replace batteries; ensure clear line of sight to indoor unit; check for interference.
Ice on coils	Low airflow or refrigerant	Clean filters; check fan operation; may indicate low refrigerant charge (call technician).
Frequent cycling	Thermostat issues	Check remote location (not in direct sunlight); verify temperature differential settings.

Reset Procedure: Turn off power at circuit breaker for 5 minutes, then restore power to reset control board.

Service Contact: American Standard Customer Service: 1-800-937-1900; www.americanstandardair.com