HI AIR KOREA ACS-2 Controller
HI AIR KOREA
Refurbished
The HI AIR KOREA ACS-2 Controller is a digital marine refrigeration and air-conditioning control unit used in shipboard cooling and condensing-unit systems.
Official HI AIR KOREA product information confirms that its marine condensing units are equipped with a digital controller (ACS-2) together with transmitters and PCB units. The manufacturer specifically lists ACS-2 applications with compressor models CMO24, CMO26, CMO28, SMC106, SMC108, FX14, FX16 and FX18.
The photographed unit is clearly marked:
Manufacturer: HI AIR KOREA
Model: ACS-2 CONTROLLER
Product Type: Marine Refrigeration / Air Conditioning Controller
Interface: LCD display with keypad
Control Indications: 1ST / 2ND / 3RD / 4TH
Status: ERR / WARN
Controls: START/STOP, HEATER, SET and navigation keys
This combination makes it highly relevant for vessels operating legacy HI AIR KOREA refrigeration and air-conditioning plants.
The ACS-2 is a digital controller used to supervise and control compressor operation in compatible HI AIR KOREA cooling systems.
The manufacturer's official cooling page identifies ACS-2 as the digital controller used on selected marine condensing-unit models.
Marine spare-parts sellers also consistently list the same equipment under:
HI AIR ACS-2 Controller
HI AIR KOREA ACS-2 Controller
ACS-2 Controller Ver 3.41
Marine A/C Controller
Refrigeration Controller
These are therefore strong and realistic search phrases.
The ACS-2 is designed to manage a compatible refrigeration or air-conditioning plant through one central controller.
Depending on installation, its functions may include:
The exact program logic depends on the ship's original HI AIR KOREA plant configuration.
The ACS-2 front panel clearly shows four status indicators:
1ST
2ND
3RD
4TH
These indicators are strongly associated with multi-stage compressor or capacity-control operation.
In marine refrigeration systems, multi-stage capacity control helps match compressor output to cooling demand and reduces unnecessary start/stop cycling.
The exact meaning of each stage depends on the compressor and refrigeration system configuration.
The ACS-2 includes a dedicated:
START / STOP
button.
This provides local control of the connected refrigeration/air-conditioning system.
Before troubleshooting a compressor that will not start, engineers should verify:
controller status
active alarm/warning
safety interlocks
pressure switches
temperature control condition
compressor starter circuit
rather than immediately assuming the ACS-2 controller is defective.
A dedicated:
HEATER
button is also visible on the front panel.
In marine refrigeration compressors, heater control is typically associated with compressor crankcase/oil heater operation or related refrigeration equipment heating functions.
The exact connected heater circuit should be confirmed from the vessel wiring diagram.
The ACS-2 uses a large green LCD display.
The screen can be used for operating information, parameter viewing and alarm/warning messages depending on the installed software version.
Competitor inventory commonly identifies a known version as:
ACS-2 Ver 3.41.
For replacement sourcing, software/revision matching is important.
Several current marine-market listings identify:
HI AIR KOREA ACS-2 Controller Ver 3.41
and list the unit as a separate spare product.
This version number is therefore an important search keyword.
However, not every ACS-2 unit should automatically be assumed to use Version 3.41.
When ordering a replacement, check the original controller's label, internal PCB, software screen or memory version if accessible.
HI AIR KOREA officially lists the following compressor models for ACS-2 applications:
CMO24
CMO26
CMO28
SMC106
SMC108
FX14
FX16
FX18.
These model names are extremely valuable related SEO keywords because ship engineers may search using the compressor model instead of the controller model.
For example:
CMO24 ACS-2 Controller
CMO26 ACS-2 Controller
SMC106 ACS-2 Controller
FX16 HI AIR Controller
may all refer to a requirement for this controller family.
Official HI AIR KOREA information describes its merchant-vessel condensing units as compact marine refrigeration systems designed for onboard installation.
The manufacturer states that the units can use refrigerants including:
R-404A
R-407C
R-134a
and are designed for marine installations with 380/440/690VAC, 50/60Hz three-phase plant power depending on system configuration.
The ACS-2 acts as the digital controller within selected systems.
The controller's own internal/control voltage should not be assumed from the plant mains voltage unless the correct ACS-2 wiring diagram confirms it.
A current equipment listing connects the HI AIR KOREA ACS-2 Controller with a:
Provision Refrigeration Unit
and identifies:
Drawing ACS-2-03
2N.2-CRKC221014 – Provision Refrigerating Plant.
This gives us another strong commercial search group:
HI AIR provision refrigeration controller
ACS-2 provision refrigeration unit
ACS-2-03 controller
CRKC221014 ACS-2
These are valuable keywords for shipowners looking for replacement refrigeration-system controls.
A recent marine refrigeration retrofit case specifically shows an ACS-2 Controller as the original control panel of a ship's main air-conditioning unit before automation retrofit.
This supports the use of search terms such as:
Marine A/C Controller
Main Air Conditioning Controller
Ship HVAC Controller
Marine Compressor Control Panel
for the ACS-2.
Different buyers and sellers may describe the ACS-2 as:
HI AIR Korea ACS-2 Controller
HI AIR ACS-2 Refrigeration Controller
Marine Air Conditioning Controller
A/C Compressor Controller
Refrigeration Plant Controller
Provision Refrigeration Controller
Marine Cooling Controller
Compressor Capacity Controller
HVAC Control Panel
Digital Compressor Controller
Using these variants naturally helps the page appear for different buyer search habits.
A related model name appearing in current trade data is:
ACS-2-HD
which is described as a HI AIR controller for an air compressor application.
This is useful as a related-model keyword.
However:
ACS-2 and ACS-2-HD should not automatically be treated as the same controller or as interchangeable units.
Exact model, plant application, hardware and software must be verified first.
Check:
incoming controller supply
fuses
terminal connections
internal power supply
PCB connectors
If power is present but the LCD remains blank, the display or controller electronics may require repair.
Check whether:
ERR/WARN is active
safety interlock is healthy
pressure switches are normal
temperature demand exists
starter circuit is ready
Do not bypass compressor protection circuits just to force operation.
The front panel includes a dedicated:
ERR / WARN
indicator.
Record the alarm message shown on the LCD before resetting the system.
The message can help determine whether the problem originates from:
sensor input
pressure condition
temperature condition
compressor stage
control circuit
controller hardware
Check:
control setpoints
compressor capacity solenoids
output wiring
stage relays
refrigeration load
A stage-control problem may originate outside the ACS-2 itself.
Check the heater output, external relay, wiring and connected heater circuit.
The HEATER button confirms heater control is part of the user interface, but the connected equipment depends on the system.
Possible causes include:
LCD ageing
backlight failure
internal power issue
display connection problem
In older controllers, repairing the display section may be possible without replacing the entire control system.
Inspect the membrane keypad / switch assembly and internal connector.
Do not repeatedly force buttons if the keypad is damaged.
Check:
software version
parameter configuration
compressor model
sensor scaling
I/O configuration
A physically identical ACS-2 may still require the correct system-specific programming.
Before replacing an ACS-2, provide:
Manufacturer: HI AIR KOREA
Model: ACS-2
Software Version: if visible
Compressor Model: CMO / SMC / FX series
Plant Type: Air Conditioning / Provision Refrigeration / Condensing Unit
Existing wiring photos
Rear terminal photos
Front display photo
Internal PCB photos
Required quantity
This greatly reduces compatibility mistakes.
Many vessels continue operating original HI AIR KOREA refrigeration and air-conditioning plants.
Replacing an entire refrigeration-control architecture can require:
new PLC/HMI
rewiring
sensor integration
programming
commissioning
extended downtime
A recent retrofit case shows an ACS-2 controller being replaced as part of a complete automation conversion—proof that these older systems remain in active ship service.
When the refrigeration plant itself is still in good condition, replacing or repairing only the ACS-2 can therefore be the more practical option.
SM MARINE SERVICE™ supports worldwide sourcing and supply of:
HI AIR KOREA ACS-2 Controllers
ACS-2 Ver 3.41 units
Marine refrigeration control panels
Compressor control PCBs
Marine HVAC controllers
HI AIR Korea refrigeration spare parts
Depending on current availability, equipment may be supplied in:
New / New Old Stock
Used Tested Working
Refurbished
Reconditioned
Current marine-market listings continue to show ACS-2 units as active replacement products, confirming ongoing demand for the controller.
For marine refrigeration, HVAC and automation spare parts, visit SM MARINE SERVICE™.
It is a digital controller used in compatible HI AIR KOREA marine refrigeration and air-conditioning systems. HI AIR KOREA officially lists ACS-2 as the digital controller used with selected condensing units.
Official HI AIR KOREA information lists:
CMO24, CMO26, CMO28, SMC106, SMC108, FX14, FX16 and FX18.
Yes. ACS-2 is documented in marine condensing units and has also been shown in an original ship main-air-conditioning automation installation.
Yes. A documented spare-equipment reference identifies an ACS-2 controller for a HI AIR KOREA Provision Refrigeration Unit.
Version 3.41 is a documented software/controller version appearing in several marine spare-parts listings.
The photographed front panel has dedicated indicators for 1ST, 2ND, 3RD and 4TH, strongly indicating multi-stage control/status functionality.
The front panel includes a dedicated HEATER control button.
It is the controller's error/warning indication. The exact alarm meaning should be read from the LCD message and the appropriate HI AIR manual.
This should not be assumed. ACS-2-HD appears as a related HI AIR controller designation, but compatibility has not been established.
Not always. Software version, system parameters and compressor configuration should be checked before installation.
SM MARINE SERVICE™ can support worldwide supply and sourcing of ACS-2 controllers and related HI AIR KOREA marine HVAC and refrigeration spare parts, subject to availability.
HI AIR KOREA ACS-2 Controller is a digital marine refrigeration and air-conditioning control unit used with compatible HI AIR KOREA condensing and cooling systems. Officially documented ACS-2 applications include CMO24, CMO26, CMO28, SMC106, SMC108, FX14, FX16 and FX18 compressor systems. The unit provides LCD-based monitoring, Start/Stop control, heater control, error/warning indication and 1st–4th stage status/control. Marine-market listings also identify ACS-2 Ver 3.41 as a common replacement reference. SM MARINE SERVICE™ supplies new, used, refurbished and reconditioned ACS-2 controllers and marine refrigeration spare parts worldwide.
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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