Fujitsu AUUH42KUAS & AOUH42KUAH1: 42,000 BTU AIRSTAGE Centauri XLTH Cold Climate Circular-Flow Ceiling Cassette Heat Pump System

The Fujitsu AUUH42KUAS paired with the AOUH42KUAH1 outdoor unit delivers exceptional heating and cooling performance in a high-efficiency 42,000 BTU-class single-zone mini-split system. Part of Fujitsu's AIRSTAGE Centauri XLTH series , this advanced cold-climate heat pump combines a discreet circular-flow ceiling cassette indoor unit with INVERTER-driven technology for dependable year-round comfort—even in extreme winter conditions as low as -15°F. Featuring optional Wi-Fi connectivity, advanced airflow distribution, whisper-quiet operation, and environmentally friendly R-32 refrigerant, this system provides outstanding efficiency, installation flexibility, and consistent comfort for residential and light commercial applications.

General Information

System Type: Circular-flow ceiling cassette indoor unit + XLTH cold-climate single-zone heat pump outdoor unit

Models: Indoor – AUUH42KUAS | Outdoor – AOUH42KUAH1

Product Series: Fujitsu AIRSTAGE Centauri XLTH

Capacities: 42,000 BTU Rated Cooling (Max 45,000) | 47,000 BTU Rated Heating (Max 51,000)

Operating Modes: Heating & Cooling with automatic operation, economy mode, energy-saving mode, powerful mode, minimum heat mode, and automatic defrosting

ENERGY STAR®: Yes – ENERGY STAR Certified, Cold Climate Certified, and Most Efficient

Refrigerant / Factory Charge: R-32, 8 lb 6 oz

AHRI Reference Number: 217895710

Key Features

XLTH Extreme Cold-Climate Heating: Provides reliable heating performance in outdoor temperatures as low as -15°F, making it an excellent solution for homes and commercial spaces in harsh winter climates.

Exceptional Heating Capacity: Delivers 47,000 BTU rated heating capacity with a maximum output of 51,000 BTU, providing approximately 11.9% higher rated heating capacity than its nominal 42,000 BTU classification.

Cold-Weather Capacity Retention: Engineered to deliver more than 100% of nominal heating capacity at 5°F and approximately 75% at -15°F, helping maintain dependable comfort during extreme winter conditions.

Advanced INVERTER Technology: Continuously adjusts compressor output to match heating and cooling demands, maximizing efficiency while maintaining consistent indoor temperatures.

Outstanding Energy Efficiency: Achieves an impressive 22.0 SEER2, 13.0 EER2, and 10.6 HSPF2 (Region IV), helping reduce energy consumption and operating costs.

Advanced Circular-Flow Cassette Design: Ceiling-mounted cassette distributes conditioned air throughout the room, helping maintain balanced temperatures and consistent comfort while minimizing visible wall-mounted equipment.

Ultra-Quiet Indoor Operation: Indoor sound levels as low as 36 dB(A) in Quiet Mode provide peaceful comfort for living rooms, offices, retail environments, and other occupied spaces.

Optional Wi-Fi Connectivity: Compatible with an optional Wi-Fi adapter for convenient remote monitoring and temperature adjustments through the Fujitsu AIRSTAGE Mobile App.

Optional Intelligent Occupancy Sensor: Compatible with an optional human sensor kit that detects room occupancy to help optimize energy savings and minimize unnecessary heating and cooling.

Multiple Fan Speed Options: Auto, High, Medium, Low, and Quiet settings provide customizable airflow and comfort for different room conditions.

Built-In Base Pan Heater: Helps prevent ice accumulation during extreme cold weather and supports reliable outdoor unit operation in winter conditions.

ProCore™ Corrosion-Resistant Indoor Coil: Features high-corrosion-resistant copper coils designed to improve durability and long-term reliability.

Blue Fin Outdoor Coil Protection: Corrosion-resistant coating protects the outdoor heat exchanger against environmental exposure and supports extended equipment life.

Built-In Condensate Drain Pump: Integrated drain pump supports efficient condensate removal, providing additional installation flexibility and simplifying moisture management.

Flexible Cassette Grille Options: Compatible with optional white or black cassette grilles, allowing the indoor unit to complement different ceiling designs and interior finishes.

Optional Fresh Air Integration: Supports a compatible fresh air intake kit to introduce outside air and enhance indoor air quality and comfort.

Enhanced Comfort Controls: Supports optional wired and wireless remote controllers, weekly timer, 24-hour timer, sleep function, economy mode, powerful mode, automatic defrosting, and auto-restart functionality.

Smart Home & Building Integration: Supports compatible wired controllers, third-party thermostat interfaces, BACnet, Modbus, and home automation systems through optional accessories.

Auxiliary Heating Integration: Built-in external input/output functionality and multiple auxiliary heat control options allow integration with compatible supplemental heating systems and third-party devices.

Group Control Capability: Supports coordinated control of multiple compatible indoor units, providing convenient temperature management for larger residential and commercial installations.

Extended Refrigerant Piping: Supports refrigerant piping lengths up to 246 feet and maximum height differences of 98 feet, providing installation flexibility for residential and light commercial applications.

Advanced External Device Integration: Supports compatible connections for fire alarms, door switches, humidifiers, auxiliary heating systems, and other third-party devices.

Service Monitoring Capability: Compatible with Fujitsu UTY-RVRU and UTY-RNRUZ-series controllers for enhanced service monitoring and system management.

Low Ambient Cooling Performance: Supports cooling operation in outdoor temperatures as low as -5°F, providing additional flexibility for applications requiring cooling during colder weather.

Specifications (Rated Conditions)

Cooling Capacity: 42,000 BTU Rated | 45,000 BTU Max | 13,600 BTU Min | SEER2: 22.0 | EER2: 13.0

Heating Capacity: 47,000 BTU Rated | 51,000 BTU Max | 14,300 BTU Min | COP2: 3.9

Cold-Weather Heating at 17°F: 31,600 BTU Rated | 48,900 BTU Max

Cold-Weather Heating at 5°F: 48,000 BTU Rated | 48,000 BTU Max

Extreme Cold-Weather Heating: Rated operating range down to -15°F | Manufacturer states approximately 75% nominal heating capacity retention at -15°F

HSPF2: 10.6 (Region IV) | 8.5 (Region V)

Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 37.5 A | Maximum Circuit Breaker: 40 A

Rated Operating Current: 14.1 A Cooling | 15.5 A Heating

Maximum Operating Current: 21.7 A Cooling | 30.7 A Heating

Indoor Airflow (Cooling): 765–1,177 CFM

Indoor Airflow (Heating): 765–1,177 CFM

Outdoor Airflow: 3,826 CFM Cooling | 3,649 CFM Heating

Indoor Sound Pressure: 36–47 dB(A) Cooling | 36–47 dB(A) Heating

Outdoor Sound Pressure: 52 dB(A) Cooling | 52 dB(A) Heating

Refrigerant: R-32 | Factory Charge: 8 lb 6 oz | Additional Refrigerant: 0.43 oz/ft

Piping: Liquid 3/8 in. | Gas 5/8 in. | Minimum Line Length: 17 ft | Maximum Line Length: 246 ft | Maximum Height Difference: 98 ft

Factory Pre-Charged Line Length: 98 ft

Outdoor Dimensions / Weight: 55-13/16 × 38-3/16 × 14-9/16 in. (H × W × D) | 225 lb

Indoor Dimensions / Weight: 11-5/16 × 33-1/16 × 33-1/16 in. (H × W × D) | 64 lb

Moisture Removal: 9.3 pints/hour

Drain Hose Connection: 13/16 in. I.D. | 1-1/16 in. O.D.

Outdoor Cooling Operating Range: -5°F to 122°F

Outdoor Heating Operating Range: -15°F to 75°F

Indoor Cooling Operating Range: 64°F to 90°F

Indoor Heating Operating Range: 60°F to 86°F

Included Components

Indoor Unit: AUUH42KUAS – 42,000 BTU-class AIRSTAGE Centauri XLTH circular-flow ceiling cassette indoor air handler featuring ProCore™ corrosion-resistant copper coils, built-in condensate drain pump, multiple fan speed options, ultra-quiet operation, and compatibility with optional Wi-Fi connectivity and occupancy sensing.

Outdoor Unit: AOUH42KUAH1 – 42,000 BTU-class AIRSTAGE Centauri XLTH cold-climate heat pump condenser featuring INVERTER-driven technology, R-32 refrigerant, built-in base pan heater, Blue Fin corrosion protection, and heating operation down to -15°F.

Cassette Grille: Compatible white and black cassette grille options are available separately to complement different ceiling designs and interior finishes.

Remote Controller: Compatible wired controllers and an optional IR receiver kit with wireless remote controller (UTY-LBTUC) are available separately for convenient temperature, fan speed, and operating mode adjustments.

Optional Wi-Fi Adapter: UTY-TFSXJ4 – Compatible Wi-Fi interface module available separately for remote system control through the Fujitsu AIRSTAGE Mobile App.

Optional Human Sensor Kit: UTY-SHZXC – Compatible occupancy sensor accessory available separately to enhance energy-saving operation based on room occupancy.

Optional Fresh Air Intake Kit: UTZ-VXRA – Compatible fresh air intake accessory available separately for additional ventilation flexibility.

Ideal For

Homeowners and HVAC contractors seeking a premium, high-efficiency circular-flow ceiling cassette mini-split heat pump capable of delivering dependable heating and cooling in challenging climates. The Fujitsu AUUH42KUAS and AOUH42KUAH1 combination is especially well suited for large open-concept living areas, spacious offices, retail environments, commercial spaces, additions, and other residential or light commercial areas requiring precise temperature control, balanced airflow distribution, and powerful cold-weather heating.

With its 22.0 SEER2 efficiency rating, heating operation down to -15°F, more than 100% nominal heating capacity at 5°F, optional Wi-Fi connectivity, whisper-quiet performance, built-in condensate drain pump, built-in base pan heater, and advanced corrosion protection , the AIRSTAGE Centauri XLTH system provides an excellent combination of comfort, energy efficiency, cold-climate performance, and long-term reliability for year-round residential and light commercial heating and cooling.