Features for PCU-SL Series
Fastest response in the industry combined with ultrahigh-precision temperature regulation
The industry's first chiller with IOF sensing has dramatically improved follow-up performance.
Ultra-fast response and pinpoint precision meets any change in operating conditions.

IOF sensing
“Industry's fastest response and ultrahigh-precision mean stable operation.”
The IOF sensor achieves unequaled circulated water temperature stability by constantly monitoring inlet temperature, outlet temperature, and flow rate, and responding to changes in load and flow-rate generated by production processes faster and more accurately than other chillers.
IOF sensing achieves superb follow-up response
The IOF sensor achieves unequaled circulated water temperature stability by constantly monitoring inlet temperature, outlet temperature, and flow rate, and responding to changes in load and flow-rate generated by production processes faster and more accurately than other chillers.
PCU-SL Series
Maintains stable circulated water temperature by quickly responding to changes in load and flow-rate.
Typical chiller
Circulated water temperature varies widely and the chiller takes longer to respond to changes in load and flow-rate.
Ultra-precise ±0.1℃
"Chillers are used in all kinds of situations, and that means there are also all kinds of usage conditions for flow-rate, load, and other factors.
Unlike other chillers, PCU-SL Series chillers constantly monitor and control inlet temperature, outlet temperature, and flow-rate. This keeps all criteria within operating specifications and achieves pinpoint-accurate temperatures of ±0.1ºC."
PCU-SL Series
Monitoring flow-rate in addition to circulated water temperature achieves optimal control.
Typical chiller
Circulated water temperature widely fluctuates because flow rate is not monitored and temperature is controlled only by temperature difference. (*Under low-flow rate, low-load conditions)
Constant cooling capacity
Air-cooling type
“Lambda airflow design achieves consistent performance”
A lambda airflow design featuring circulation routes on multiple sides of the top of the unit both maximizes condensation area and, unlike past chillers, distributes airflow evenly between the top and bottom of the unit.
The design also maintains performance even under high temperature and clogged filter conditions.
High-temperature conditions
Excellent cooling performance even when outdoor air is an exceptionally hot 45°C.
Clogged filter
Even when the filter screen rate is 80%, cooling capacity stays at 75%.
Water-cooling type
“Tower condenser achieves consistent performance”
High-performance tower condenser controls coolant pooling.
A 90% effective capacity that maintains cooling water performance even under high-temperature, low-flow conditions makes this tower condenser the best in its class.
When cooling water high temperature
It demonstrates a high cooling capacity even at a high temperature of 45°C cooling water.
When cooling water low flow amount
It maintains 96% of the cooling capacity even at a low flow rate of 15L / min of the cooling water.
Double-crank structure
“The industry's most durable structure means superb reliability.”
A main frame with a double-crank structure ensures stable operation not only when shipping within Japan but also when doing long-distance shipping to overseas destinations.
Double-crank structure clears maximum acceleration of 1.92G
A structural design focused on meeting the US Department of Defense military standards (MIL) achieves an exceptionally robust structure capable of withstanding vibrations up to 1.92G.
The chiller can also be relied on in settings where extreme vibrations are the norm, such as long distance overseas transport.
Bottom-top separator design meets IP-x4 water resistance standards
When used outside, the PCU-SU Series bottom-top separator structure protects electrical components and other parts from the elements.
The design achieves exceptional waterproof performance that exceed the demanding criteria of the JIS IP-x4 testing standard.
Three-valve control / Wide-range
“Three-valve control enables a wide-range of applications.”
In addition to a main valve, PCU-SL Series chillers have a cooling valve for controlling low-temperature refrigerant and a heating valve for controlling exhaust heat that make them compatible with a wide-range of usage conditions.
A wide range spanning -5℃ to 45℃
A triple-valve control achieves flexibility for meeting every type of chiller application. One of the triple-valve’s most impressive features is its ability to lower the temperature of coolant circulating back to the compressor by bypassing low-temperature coolant. While the condensers in older model chillers stop running when they take in coolant at high temperatures, the triple-valve control makes it possible to run the chiller with circulating water at very high temperatures above 45ºC, as well as at very low temperatures below -5ºC. Additionally, a heating valve that releases heat after heat exchange achieves heat-less operation that reduces a common source of breakdowns and also saves energy.
Inverter control
“Newly developed energy-efficient inverter”
The compressor, fan motor, and pump are all controlled with a newly developed inverter.
Cooling constantly and optimally synchronized with load achieves up to 50% energy savings.
* Fan motor applies to air-cooling type only.
Up to 50% energy conservation
Maintains compressor, fan motor, and pump RPM at optimal rate.
Flexible operation control
A typical chiller controls operation according to the specified pump RPM rate. But PCU-SL Series chillers control operation with the help of additional new parameters:“ circulated water pressure” and “circulated water volume”.
Flexible yet user-friendly
Interface & Monitor Display
"The compressor, fan motor, and pump are all controlled with a newly developed inverter.
Cooling constantly and optimally synchronized with load achieves up to 50% energy savings."
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External output
- Operation stop output
- Error output
- Pump output
- Circulated water temperature upper-limit output
- Circulated water temperature lower-limit output
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External input
- Operation stop input
- Error reset input
- Emergency stop input
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External communication
- Ethernet (10BASE-T/100BASE-TX)
- Communication protocol (Socket, MC protocol)
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Timer functions
- On timer function
- Off timer function
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Operation time monitor
- Compressor operation time
- Fan operation time
- Pump operation time
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Guidance and help functions
- Settings menu guidance function
- Troubleshooting help function
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Key lock/password settings
Excellent PLC compatibility
PLC link
MC protocol drastically reduces program preparation and debugging workload. Get the system up and running in less time and at less cost than ever before.
* MC protocol is an abbreviation for Melsec communication protocol.
Example: For changing the circulating water temperature setting.
Item | Typical chiller | PCU-SL Series |
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Communication method | ![]() |
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Ladder programming | ![]() |
Compared with SOCKET communication, ladder programming is 1/7 easier. |
Enter command | ![]() |
No need to enter cumbersome commands. |
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