General Assist Product Reference
R32 Wall Mounted KU, KM and CM Series
Product features, model line-up, installation requirements and specifications
Applicable to the legacy Fujitsu General ASTG KU, KM and CM wall-mounted ranges described in the 2013 product guide
The KU, KM and CM series introduced Fujitsu General's first generation of R32 wall-mounted air conditioners in Australia. The range combined a simplified indoor-unit design with improved efficiency, motion-sensor control, demand-response capability and a new flare-less indoor pipe connection.
Legacy product information: This guide is based on a brochure printed in August 2013. Product availability, replacement models, refrigerant-handling requirements and applicable standards may have changed. Always confirm current requirements and use the installation manual for the exact model.
1. Product line-up
| Series | Application | Models in brochure |
|---|---|---|
| KU Series | Designer reverse-cycle range | ASTG09KUCA, ASTG12KUCA, ASTG18KUCA |
| KM Series | Standard reverse-cycle range | ASTG09KMCA, ASTG12KMCA, ASTG18KMCA, ASTG22KMCA, ASTG24KMCA |
| CM Series | Cooling-only range | ASTG07CMCA, ASTG09CMCA, ASTG12CMCA, ASTG18CMCA, ASTG24CMCA |
The range covered nominal cooling capacities from 2.1 kW to 7.1 kW in the Australian brochure. The broader product-development chart also referenced capacity classes from 2.0 kW to 10.0 kW.
2. Energy-efficiency technology
R32 refrigerant: The range used R32 to support improved system efficiency while reducing refrigerant charge compared with previous refrigerant platforms.
- All-DC design: High-efficiency DC fan motors and DC rotary or twin-rotary compressors.
- i-PAM inverter control: Adjusts the current waveform to reduce inverter losses and support smoother compressor operation.
- High-density multi-path heat exchanger: Uses additional refrigerant paths and thinner internally grooved copper tubing to improve heat transfer.
- Partial-load efficiency: Compressor technology was optimised for the lower-capacity operation that occurs during most normal running hours.
- Demand Control PCB: Installed as standard across the range for demand-response and peak-load management.
The brochure promotes cooling star ratings of up to 5.0 for the listed Australian KU, KM and CM models. Some introductory brochure text also references 5.5 stars for a 2.1 kW capacity class; always use the rating shown for the exact model on its current energy label or specification sheet.
3. Comfort and usability
Human sensor energy control
The built-in pyroelectric infrared sensor monitors an area up to approximately 6 metres, with a stated horizontal detection angle of 100 degrees and vertical angle of 90 degrees.
- After approximately 20 minutes without detected movement, the unit enters energy-saving operation.
- During cooling or dry operation, the set temperature is increased by 2°C, subject to the stated maximum.
- During heating, the set temperature is reduced by 4°C, subject to the stated minimum.
- Normal operation resumes when occupancy is detected again.
Airflow, noise and timers
- KM airflow control: The diffuser automatically selects an appropriate angle for heating or cooling to improve room circulation.
- Quiet operation: Selected 2.1 kW, 2.5 kW and 3.5 kW models were promoted at sound levels as low as 21 dB(A) in Quiet mode.
- Wireless weekly timer: Supplied as standard, allowing different on and off periods to be scheduled by day.
4. Flare-less indoor pipe connection
The indoor unit uses a flare-less joint. The outdoor unit retains a conventional flare connection. The flare-less joint is assembled by inserting the prepared pipe and tightening the supplied nut to the specified torque.
Important: The flare-less joint does not eliminate the need for correct pipe preparation, insertion depth, torque control, leak testing or competent installation. Do not reuse a removed flare-less joint nut; fit a new joint nut when reconnecting the pipe.
Connection procedure
| 1 | Mark the pipe at the insertion length specified for its diameter. |
| 2 | Rotate the nut approximately one-half turn to open the pipe insertion point. |
| 3 | Insert the pipe fully until the marked line is no longer visible. |
| 4 | Tighten the flare-less joint nut with a torque wrench. |
| 5 | Confirm the joint gap is 0.5 mm or less and that the insertion line remains hidden. |
Pipe insertion and tightening values
| Pipe diameter | Insertion mark L | Tightening torque |
|---|---|---|
| 6.35 mm (1/4 in.) | 20–21 mm | 16–18 N·m |
| 9.52 mm (3/8 in.) | 21–22 mm | 32–42 N·m |
| 12.70 mm (1/2 in.) | 25–26 mm | 49–61 N·m |
Tools
Most installation tools are the same type used for R410A systems, subject to refrigerant compatibility and manufacturer approval.
| Tool or equipment | Requirement |
|---|---|
| Vacuum pump, manifold, hoses, flare tools, pipe tools and torque wrench | Generally the same type as R410A equipment, provided it is suitable for R32 service. |
| Recovery unit | Must be approved for R32. The brochure specifically excludes units using a series motor with carbon brushes. |
| Service refrigerant cylinder | Dedicated R32 cylinder. |
| Recovery cylinder | Dedicated compatible cylinder. Do not mix refrigerants during recovery. |
| Flare-less joint removal tool | Special tool required when disconnecting the indoor flare-less joint. |
5. Frequently asked questions
Is a special R32 installation qualification required?
The original brochure states that no separate R32-specific installation qualification was required. Installation and service must still be completed by appropriately qualified and licensed personnel, with current legal and safety requirements confirmed before work begins.
Is the service-port size the same as R410A?
Yes. The brochure states that the service-port diameter is the same as R410A.
Can R410A recovery equipment be used?
Only where the recovery unit manufacturer confirms that the equipment is suitable for R32. Units using a carbon-brush series motor must not be used. A dedicated compatible recovery cylinder is required.
Can different refrigerants be mixed?
No. Refrigerants must not be mixed. The brochure advises replacing an incorrect charge immediately because oil compatibility and equipment performance cannot be guaranteed.
Can an R410A indoor unit be connected to an R32 outdoor unit?
No. The matched R32 indoor and outdoor units must be used. Performance and reliability are not guaranteed with an incorrect combination.
6. Controllers and accessories
| Accessory | Part number |
|---|---|
| High-grade wired remote controller | UTY-RVNYM |
| Standard wired remote controller | UTY-RNNYM |
| Simple remote controller | UTY-RSNYM |
| External connect kit | UTY-XWZXZ5 |
| Communication kit | UTY-TMBXF1 |
Accessory compatibility can vary by indoor-unit model. Confirm the applicable installation instructions and interface requirements before ordering.
7. KM Series specification highlights
| Indoor model | Cooling | Heating | Cooling star rating | Indoor sound pressure | Pipe size |
|---|---|---|---|---|---|
| ASTG09KMCA | 2.5 kW | 3.2 kW | 5.0 | 40 dB(A) | 6.35 / 9.52 mm |
| ASTG12KMCA | 3.5 kW | 3.7 kW | 3.5 | 42 dB(A) | 6.35 / 9.52 mm |
| ASTG18KMCA | 5.0 kW | 6.0 kW | 3.5 | 45 dB(A) | 6.35 / 9.52 mm |
| ASTG22KMCA | 6.0 kW | 7.2 kW | 3.0 | 48 dB(A) | 6.35 / 12.70 mm |
| ASTG24KMCA | 7.1 kW | 8.0 kW | 2.5 | 49 dB(A) | 6.35 / 12.70 mm |
All listed KM models use R32 refrigerant. Rated values are based on the conditions stated in the original brochure and may differ from current registration data or replacement products.
8. Installation and service requirements
- Only appropriately qualified and experienced persons or companies should install, service or repair the equipment.
- Use the matched indoor and outdoor models and the specified R32 refrigerant only.
- Provide suitable access for commissioning, maintenance, warranty and service.
- Follow the model-specific installation manual for pipe lengths, additional charge, clearances, electrical supply and test procedures.
- The original brochure states that capacity and efficiency ratings were based on AS/NZS 3823.2 test conditions.
- Confirm all current electrical, refrigerant-handling, work health and safety, and R32 requirements before commencing work.
Source: Fujitsu General, New Wall Mounted KU/KM/CM Series, printed in Australia, 23 August 2013. This article is a practical summary and does not replace the model installation manual, service manual, current product data, legislation, standards or professional judgement.