RKS J Compact Chiller With Water Tank (Air Cooled) Economy Model : Easy of Use + Convenience + Affordability

RKS753J-V / RKS1503J-V

Cooling Capacity
10 to 40 ℃
Operable Liquid
15 to 35 ℃
Control Precision
  • ±2.0 ℃ temperature control is possible with compressor ON/OFF control. Works just about anywhere!
  • High Pressure Pump Built In
(Left) RKS753J-V (Right) RKS1503J-V
(Left) RKS753J-V (Right) RKS1503J-V

Simple and Safe Design and Controller

Easy operation with just the press of a button. Error code display gives important information about the alarm. Allows for quick recovery after an issue.

Simple and Safe Design

Output Signals

  • Operation Signal
  • Alarm Signal
  • Remote Signal

Operating Mode

  • Freeze-Prevention Mode
  • Warm Up Mode
  • Discharge Pump-Only-Operation
  • Automatic recovery after power outage etc.

Large diameter water supply port for easy tank cleaning.
Easy-to-Check LED-Lit Water Level Gauge


Φ100 mm large water supply port makes it easy to clean the inside of the tank!
The high capacity tank means less frequent water shortage warnings, less frequent water supplying, and less change in water temperature due to changing loads.
A built-in blue LED-lit water indicator makes it easy to check the water level!

Wide mouth water supply port for easy tank cleaning.
Wide mouth water supply port
Makes cleaning the inside of the tank easy!
Easy-to-Check LED-Lit Water Level Gauge
LED-Lit Water Level Gauge

Comes standard with a filter to help prevent clogging!

Clogging Prevention Filter

Comes standard with a filter to help prevent clogging!
Easy toolless-removable filter design. Filter can be directly cleaned for easy removal of dirt and reduced manpower, and adds to operating stability of the chiller.


RKS753J-V RKS1503J-V
Performance Cooling Capacity (50/60 Hz)※1 kW 2.2/2.5 4.9/5.3
Operable Ambient Temperature Range 10 to 40
Operating Temperature Range (Liquid temp) 15 to 35
Operable Water Pressure MPa 0.05 to 0.2 / 0.3 (50/60 Hz) 0.1 to 0.5
Control Precision※4 ±2.0
Min. Operating Circulation Rate (50/60 Hz) L/min 10
(Head: 20/30 m)
(Head: 50 m)
Electrical Specifications Power Source※2 V(Hz) Three-phase 200±10% (50/60) / 220±10% (60)
Power Consumption (50/60 Hz)※1 kW 0.9/1.1, 1.1 1.8/2.2, 2.2
Electric Current (50/60 Hz)※1 A 4.1/4.1, 4.1 6.8/7.4, 7.4
Power Capacity※3 kVA 2.0 4.2
Breaker Capacity※5 A 10 15
Operation Control Method Compressor ON/OFF Control
Equipment Specifications Refrigeration Compressor Construction Hermetically sealed rotary type
Output kW 0.85 1.8
Condenser Corrugated fin and tube parallel flow
Evaporator 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. 17
Refrigerant R-410A
External Dimensions (HxDxW) mm 615×500×375 933×590×375
Mass (Dry mass) kg 45 67
Operating Noise Level (50/60 Hz)※6 dB 61/63 63/66
  1. Under the following conditions: Chilled water temp.: 20 ℃, ambient temp: 25 ℃, maximum discharge pump circulating load. Cooling capacity is at least 95% of the noted value. Heating capacity will change according to operating conditions.
  2. Source voltage phase unbalance should be less than ±3%.
  3. The figure noted is when operating at the highest capacity of its specified operating range.
  4. When the current load is continuously within ±10%, and the ambient temperature is stable. However does not include starting times or when the heat-load exceeds the chiller capacity.
  5. Comes standard with a built-in overload protection circuit breaker (NFB).
  6. Operating noise levels are from a position of 1 m in front of the unit and at a height of 1 m.
  1. The recommended liquid (chilled water) for use in this product is clean water or a 30% to 40% solution of industrial-use ethylene glycol. Use Aurora Brine or Nai-Brine Z-1 industrial-use ethylene glycol. Alternatively, if conditioned water is used, then it should have an electrical conductivity of at least 1 µS/cm. Note that there will be a 10% drop in cooling capacity if using a low-concentration 30% to 40% ethylene glycol solution.
  2. Heat output from the product (in kW) is approx. 1.3 times that of its cooling capacity.
  3. Depending on the operating environment, condensation may form on piping inside the product, and temporary leakage of water from the pump mechanical seals may also occur, therefore a drain pan (sold separately) should be installed if required.