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Temperature control equipment
Choosing an oil chiller

VSC series

How to select a model in the VSC Series

1. Method for selecting the oil chiller model

Selection flow

A - Checking the cooling capacity

① Determine the method of setting the target values.

The target values (SV) of oil chillers can be set by an absolute value method in which the desired value is input, or by a method that inputs the value from an external temperature sensor.

(a) Absolute value control

SV = Absolute value (set to 35 ℃ on the diagram below)


Set between 5 ℃ and 50 ℃

(b) Machine body temperature synchronization control

SV = Machine body temperature synchronization (external temperature input)


Oil chiller

The set temperature is synchronized with the temperature measured at X and changes in real time. The measured temperature can be controlled between -19.9 and +19.9 ℃.

(c) Internal temperature synchronization control

SV = Room temperature synchronization (external temperature input)


Oil chiller

The set temperature is synchronized with the temperature measured at X and changes in real time. The measured temperature can be controlled between -19.9 and +19.9 ℃.

② Check the maximum temperature in the usage environment.

Apiste oil chillers are air-cooled, so the cooling capacity depends on the surrounding temperature.
The higher the surrounding temperature, the lower the cooling capacity, so check the maximum temperature in the usage environment.

③ Determine the minimum target temperature.

Determine the target oil temperature. When using the external temperature sensor input method, check the minimum expected temperature.

④ Check the oil chiller's cooling capacity.

The oil chiller's cooling capacity varies according to the temperature in the usage environment, the target oil temperature and the power supply frequency.
The graph indicating this variation character is called the “cooling capacity properties graph”, and can be found in the specifications.

Example) ① Target setting: (a) Absolute value control, ② Maximum temperature in usage environment: 30 ℃, ③ Minimum target temperature: 20 ℃ or greater. The graph on the right shows that under these conditions, the cooling capacity of the VSC-3200S (60 Hz) is approximately 2400 W.

The capacity required for cooling can be calculated from the change in temperature of the oil tank, the difference in the flow and temperature of the circulating oil, etc.
See below for more detailed information on determining the cooling capacity of an oil chiller.

⇒ Refer to “Calorific calculation method”

B - Determining the control point

① Determine the control point.

The oil chiller's control point (PV) can be selected among the oil chiller's entry oil temperature, its exit oil temperature, or the oil temperature at any other position the client wishes (external temperature input).

(a) Entry oil temperature

PV = Entry temperature

(b) Exit oil temperature

PV = Exit temperature

(c) External temperature input control

PV = External temperature input (device-side oil exit pipe)

② Correct the cooling capacity.

The oil chiller's cooling capacity properties graph indicates the properties when the exit oil temperature is used as the control point.
Because of this, the cooling capacity calculated in “A” can be used as such when using exit oil temperature control, but when the entry oil temperature or external temperature input is selected as the control point, the cooling capacity is about 80% the value calculated in “A” because the exit temperature is lower than the entry temperature.

Example) ① From the formula below, we see that the correction value for the cooling capacity calculated in “A” when (a) entry oil temperature control is selected as the control point is approximately 1920 W.
2400×0.8=1920 [W]

C - Checking whether the oil can be used

① Check whether the oil to be used fulfills the oil chiller's specifications.

Use oil that meets all the conditions below in the oil chiller.

  1. ① Lubricating oil or hydraulic oil (mineral oil)
  2. ② Type 3 or 4 oil among the Type 4 hazardous substances defined in the Fire Services Act
  3. ③ Oils corresponding to color change number 1 in JIS K 2513, Petroleum Products - Corrosiveness To Copper - Strip Test
  4. ④ Kinematic viscosity of 1.4 to 200 mm²/s

* Even oils meeting all of the conditions above may affect the product if they have deteriorated. We recommend performing periodic maintenance of the oil.

The viscosity of oils changes according to the temperature. Use the graph below to check whether the oil you want to use fulfills the above specifications.

② Correct the cooling capacity.

The oil chiller's cooling capacity properties graph indicates the properties when using ISO VG5 oil.
The cooling capacity calculated in “B” can be used as such when using ISO VG5.
When using ISO VG32, the viscosity of the oil is higher than ISO VG5, so the cooling efficiency is lower.
Because of this, the cooling capacity when using ISO VG32 is about 90% the value calculated in “B”.

Example) ① From the formula below, we see that the correction value for the cooling capacity calculated in “B” when using ISO VG32 is approximately 1728 W.
1920×0.9=1728 [W]

Check that the cooling capacity found in A to C above is higher than the load heat capacity of the device to be used.

* The cooling capacity and heat capacity differ according to the usage environment, the conditions of the oil being used and the device's operating conditions. We recommend performing a test when deciding on the model to check in advance that the oil chiller's cooling capacity is higher than the load heat capacity.