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Oil cooling unit AKJ9 Features

Features of AKJ9 SERIES are explained.

Oil cooling unit AKJ9 SERIES Immersion typeRoHS-compliant Features

  • It is a cooler that is placed on the coolant tank and cools the fluid inside the tank directly with a cooling coil.

    * The circulation pump is not provided as an accessory and must be prepared separately by the customer.

  • High-Accuracy type with inverter compressor and electronic expansion valve
  • Open type cooler of stainless steel
  • New refrigerant R410A (Modulus of rupture of ozone layer:0)
  • Temperature control in low-load range attained by wide cooling capacity control (Conventional: 10~100%→9 series: 5~100%)
  • Wide operating temperature range (Room temperature: 5~45℃, Tank oil temperature:5~50℃)

1. Immersion-type oil cooling unit mounted directly on the coolant tank


More compact


The smallest size in the class

Comparison in the AKJ459 class (units: mm)

2. Enhanced support for shallow tanks with reduced cooling coil depth


More compact


Enhanced support for shallow tanks with reduced cooling coil depth

*Comparison in the AKJ359 class (units: mm)

3. Achieve high energy-saving performance

Achieve high energy-saving performance with the adoption of a Daikin original IPM motor and R410A refrigerant for high COP characteristics.


Comparison taking a non-inverter model to have a power consumption of 100
Measured during the Daikin model operation pattern

4. Extension of cooling capacity control range

±0.1°C oil temperature control realized over a load range from 0% (no load) to 100%.

Note: Pattern diagram with the heating load stabilized at 0 - 100%

5. Simple monitoring of operating status

The room temperature, tank fluid temperature and other internal data can be monitored at a personal computer using Hybrid-Win*. Operating status can be grasped easily with one list presenting all the data collectively.


Hybrid-Win is a software tool for monitoring the internal status at a personal computer. Please contact your nearest Daikin distributer to get information of it in details.

Sales Network

The communications cable and the monitor harness must be purchased separately.

6. RoHS-compliant

Complies with the RoHS Directive, e.g. by adopting printed circuit boards with lead-free solder.

7. Increased tolerance of harsh factory conditions including mist and dust

The ingress protection of the control box has been upgraded (equivalent to IP54).

Sulfur-free parts have been adopted for electronic components.

8. Increased tolerance of long-distance transportation

The specifications for vibration durability during transport have been upgraded to reflect actual transportation conditions.

9. Functions featured

Refrigerant gas shortage detection function

When the refrigerant gas leak status occurs (cooling disabled), alarm signals are output. Prevents damage to the machine and machining defects.

Temperature warning function

A warning signal can be output when the targeted fluid temperature or air temperature was out of the arbitrary setting range.

Autotuning function

This function substantially minimizes trial operation adjustment time by automatically setting the gain when fluid temperature control is not stable with the factory setting or when optimization is required.

999-hour timer function (ON timer)

The operation start time can be set in a range between 0 and 999 hours (in hour units).

10. The shortest delivery, four-type specifications available in addition to the standard model All optional specifications are listed as semi-standard.

All optional specifications are listed as semi-standard.

Oil cooling unit lineup

AKZ9 SERIES Circulation type

- High-Accuracy, Energy-saving, Compact
Environmentally Friendly Inverter Oil Cooling Unit

AKJ9 SERIES Immersion type

- Immersion-type oil cooling unit mounted directly on the coolant tank
- High-Accuracy model with the inverter-controlled compressor

AKC9 SERIES Circulation type

- Inline type cooling unit for coolant
- Highly accurate temperature control model by inverter control