RKS-GM Compact Chiller With Water Tank (Water Cooled) The ORION RKS Series Mid-Grade water cooled chillers.


Cooling Capacity
Ambient Tempe. Range
5 - 40 ℃
Working Liquid Temperature
5 - 35 ℃
Temperature Control Accuracy
  • Electronic expansion valve capacity control gives temperature precision to ±0.1 ℃.
  • High head pump (30 mor higher) STANDARD!
    • 20 m on RKS750G, 50 Hz models.
(Left) RKS750G-MVW (Right) RKS1500G-MVW
(Left) RKS750G-MVW (Right) RKS1500G-MVW
Sheet Metal Construction of External Surfaces

Sheet metal constructed exterior that can withstand the long life of this chiller.

Frame Construction

A sturdy construction that gets its rigidity from its frame design.

High Capacity Water Tank

The 10 L high-capacity water tank is designed to deal with liquid temperature fluctuations better.

Operation and Monitoring Via PC Possible
Communications Method
Communications Method

USB: 1 Port, RS-422A: 32 Units

Items that can be controlled via PC:
  • Starting and stopping of individual chiller units.
  • Individual operation of chiller discharge pumps.
  • Liquid temp. control of individual chillers.


Cooling Capacity (50/60 Hz)※1 kW 2.2/2.5 4.9/5.3
Heating Capacity (50/60 Hz)※5 kW 0.6/0.7 1.2/1.4
Operable ambient Temperature Range 5 - 40
Operating Temp. Range
(Liquid Temp.)
5 - 35
Operating Water Pressure MPa 0.05 - 0.2 / 0.3 (50/60 Hz) 0.1 - 0.5
Control Precision※4 ±0.1
Min. Operating Circulation Rate
(50/60 Hz)
L/min 10 (Head: 20/30 m) 12/21 (Head: 50 m)
Power Source※2 V(Hz) Three-phase 200±10%(50/60) Three-phase 220±10%(60) Three-phase 200±10%(50/60) Three-phase 220±10%(60)
Power Consumption (50/60 Hz)※1 kW 0.9/1.1 1.1 1.8/2.2 2.2
Electric Current※1 A 3.9/3.7 3.7 6.7/7.2 7.2
Power Capacity※3 kVA 2.0 3.9
Breaker Capacity A 10 15
Operation Control Method Electronic expansion valve capacity control
Compressor Construction Fully sealed rotary type
Output kW 0.85 1.8
Condenser Plate type heat exchanger
Heat exchanger Construction Plate type heat exchanger
Material SUS316 (Brazing: Cu)
Discharge Pump Construction Cascade type
Output kW 0.25 0.4
Water Tank Capacity L approx. 10
Refrigerant R410A
Charge Amount kg 0.46 0.59
External Dimensions (HxDxW) mm 615×500×375 933×590×375
Product Mass (Dry weight) kg 55 85
Operating Noise Level※6 dB 59/62 64/65
  1. Operating conditions: Chilled water temp.: 20 ℃, Ambient temp.: 25 ℃, Cooling capacity is at least 95% of listed figures.
  2. Source voltage phase unbalance should be less than ±3%.
  3. The figure noted is when operating at the highest capacity in the nomal operating range.
  4. When the current load is continuously within ±10%, and the ambient temperature is stable. However does not include starting time.
  5. Maximum heating power when: Chilled water temperature: 20 ℃, Ambient temperature: 25 ℃, Discharge pump and head at maximum. Power will change depending on operating conditions.
  6. Operating noise levels are from a position of 1 m in front of the product and at a height of 1 m.
  1. Liquid (chilled water) that can be used are either clean water and a 30 to 40% ethylene glycol solution. Note that there will be a drop in cooling capacity of 10% if using a 30 to 40% ethylene glycol solution. Altematively, if deionized water is to be used, it should have an electrical conductivity of at least 1 µS/cm.
  2. Do not use aluminum parts for parts that will be wetted with the water. Electric corrosion of aluminum can cause clogging in the heat exchanger.
  3. Heat output from the unit (in kW) is approx. 1.3 times that of the cooling capacity.