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Fujitsu
Fujitsu Comfort 3.4kW Reverse Cycle Split System
Cooling3.40kW
Heating4.00kW
Room size20-35 m2
Indoor noise20-42 dB
Warranty5 years
The Fujitsu Comfort 3.4kW reverse cycle split system is a practical all-rounder for bedrooms, home offices, and small living spaces, offering inverter efficiency, R32 refrigerant, and a quiet operating mode suitable for overnight use.
Final sizing should be confirmed through an on-site assessment, as insulation, ceiling height, glazing, sun exposure and room layout can all affect the right unit choice.
Overview of Fujitsu Comfort 3.4kW Reverse Cycle Split System
▾The ASTH12KNCA pairs with the AOTH12KNCA outdoor unit and sits in the lower-medium capacity bracket at 3.4kW cooling and 4.0kW heating. Like all units in the Comfort range, it uses i-PAM all-DC inverter technology, which modulates compressor speed continuously to match the room’s heat load rather than cycling between full power and off. This results in steadier temperatures and lower energy use during part-load operation — the typical condition when maintaining overnight temperature in a bedroom.
R32 refrigerant is used throughout the Comfort range, with a 700g charge in the ASTH12KNCA. R32 has a global warming potential approximately 68% lower than R410A, and its higher efficiency per unit mass means smaller refrigerant charges overall. Pipe connections are 6.35mm liquid and 9.52mm gas, with a maximum run of 20m from outdoor to indoor unit.
Wi-Fi control is available via the optional UTY-NXT-BOX adaptor but is not included as standard. The washable panel simplifies maintenance without calling a technician. Auto Restart, Program Timer, and Auto Louvre are standard across the range.
– i-PAM all-DC inverter compressor for efficient variable-speed operation
– R32 refrigerant (700g charge) with lower environmental impact than R410A
– Super Quiet Mode at 20 dB(A) cooling — among the quietest in the range
– Automatic louvre control for hands-free airflow direction
– Auto Restart after power interruption
– Washable panel for owner-serviceable cleaning
Is the Fujitsu Comfort 3.4kW Reverse Cycle Split System right for your home?
▾– Bedrooms requiring quiet overnight operation
– Home offices with regular daytime use
– Small apartments or single rooms up to approximately 25–30 m2
– Replacement of older small-capacity units where existing pipework is within 20m
Performance & Efficiency
▾Cooling Capacity
3.4 kW
Heating Capacity
4 kW
Recommended Room
20–35 m²
Inverter
Yes
YesEER
3.54
COP (Heating)
4
Star ratings from Fujitsu ZERL (average climate zone used): cooling 4/3.5/4 (hot/average/cold); heating 3/2.5/2 (hot/average/cold). Annual EER and annual COP not published by manufacturer.
Noise Levels
▾Indoor Min
20 dB(A)
Indoor Max
42 dB(A)
Outdoor
50 dB(A)
Indoor: 20 dB(A) quiet cooling / 22 dB(A) quiet heating / 42 dB(A) high heating. Outdoor: 50 dB(A).
Power & Installation
▾Power Supply
240V Single Phase
Max Power Input
1 kW
Max Current
5.1 A
Max Pipe Length
20 m
Max Pipe Height
15 m
Refrigerant & Environment
▾Refrigerant
R32
Dimensions & Weight
▾Indoor (W×H×D)
834 × 270 × 215 mm
Outdoor (W×H×D)
663 × 541 × 290 mm
Warranty
▾Warranty period
5years
5-year full parts and labour warranty.
Model Details
▾Model NameComfort
Model NumberASTH12KNCA
Indoor UnitASTH12KNCA
Outdoor UnitAOTH12KNCA
Features
▾Quiet Mode
Turbo Mode
Sleep Mode
Energy Efficiency & Performance
▾The ASTH12KNCA achieves a rated EER of 3.54 for cooling and a COP of 4.0 for heating. These place it in a solid efficiency range for a 3.4kW unit — particularly the heating COP, which means the unit produces 4kW of heat per kilowatt of electricity consumed at rated conditions.
Under the Fujitsu ZERL (Zoned Energy Rating Label) system, the unit holds 3.5 stars for cooling and 2.5 stars for heating in the average climate zone. The cold-zone heating star rating drops to 2, reflecting that heat pump efficiency decreases as outdoor temperatures fall — relevant for Hunter Valley winters where overnight temperatures can reach low single digits. Inverter operation helps offset this by keeping the compressor running at an efficient modulated speed rather than cycling. A rooftop solar system will reduce running costs during the periods of highest cooling demand.
Installation Notes for the Fujitsu Comfort 3.4kW Reverse Cycle Split System
▾This system pairs the ASTH12KNCA indoor unit with the AOTH12KNCA outdoor unit.
Published installation details include maximum pipe length of 20m, maximum height difference of 15m, power supply: 240v_single_phase.
A site assessment should confirm unit placement, pipe route, drainage, electrical requirements and final room sizing before installation.
Warranty Information
▾This unit has a 5-year warranty, based on the warranty information recorded for this model.
5-year full parts and labour warranty.
Warranty coverage depends on correct installation, normal use, maintenance requirements and the manufacturer’s current warranty terms.
Frequently Asked Questions
▾Is the ASTH12KNCA suitable for a bedroom?
Yes. It is rated for small rooms and operates at 20 dB(A) in Super Quiet Mode -- effectively inaudible in a quiet bedroom. It suits rooms up to approximately 25--30 m2.
What is the noise level during sleep mode?
Indoor sound pressure in quiet mode is 20 dB(A) for cooling and 22 dB(A) for heating. High fan speed reaches 42 dB(A) heating.
Does it include Wi-Fi?
No. Wi-Fi control requires the optional UTY-NXT-BOX adaptor, which should be specified at installation time.
What warranty applies?
Fujitsu General Australia provides a 5-year full parts and labour warranty on all domestic systems.
Can it replace an older unit on existing pipework?
Possibly. The maximum pipe run is 20m with a 15m height difference. Your installer will confirm suitability of the existing pipe before proceeding.