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Refrigerated Air Intake Dehumidifier / Chiller for Octane Knock Engines

Cool, controlled, collected.
ASTM D2699, ASTM D2700,

								ASTM D2699, ASTM D2700, 

Designed with assurance.

Replacing the conventional ice tower used for dehumidifying intake air to the CFR octane knock engine both in lab and on-line engines Model 500 is a refrigerated system that filters room air as it is drawn into the unit by a CFR carburetor. Designed to chill the inlet air from 1.5 to 3.5C with precision, this dehumidifier / chiller uses ozone-friendly, commonly available refrigerant, and the temperature is adjustable via a front-mounted digital indicating controller.

Using the same resourceful refrigeration system, a separate 10-liter (2.5 gal) liquid, well-insulated reservoir has the ability to be cooled as low as -10C with a temperature stability of 0.5C. Using a front-mounted digital controller, the reservoir temperature is quickly adjustable. The reservoir also comes equipped with a pump to circulate the cooling fluid to the engine’s carburetor, as well as to test if the fuel bowl requires chilling.

To shield against corrosion, the compact, lockable caster-mounted cabinet is constructed of anodized aluminum framing with side panels of painted aluminum-plastic composite, and measures approximately 24 inches square at the base. The stainless steel construction of the condensation pan ensures sustainability and protects against rusting, while expediently enabling the condensate to drain via a plastic tube to a floor drain.

Adhering to ASTM methods D2699, D2700 and D2885, the Model 500 dehumidifier / chiller comes fully assembled and ready to connect to the Waukesha-supplied humidifier tube leading to the carburetor. Equipped with all necessary plastic tubing for connection to the carburetor (via front-mounted quick disconnect in- and out-couplings), the tubing is insulated to prevent sweating. A separate set of connections is provided by quick disconnect couplings for hoses for chilling the sample fuel bowl.

The easily accessible, front-mounted control panel includes a main power switch, a power switch for the pump, and two digital display controllers (air temperature and liquid reservoir temperature).

features__astm compliant

The following accessories are recommended for purchase in sequential order (see eStore):

1st Year:
No accessories are required
2nd Year:
No accessories are required
Remaining Parts:


Test method compliance    D2699, D2700, D2885
Temperature range     Ambient to -10°C 
Temperature stability    +0.5°C
Temperature control     Front mounted digital controller 
Bath volume    10 liters (2.5 gal) liquid 
Bath medium    1 part antifreeze 2 parts water, stainless steel condenser pan. Anodized aluminum framing with side panel with printed aluminum plastic composite to prevent corrosion and rust.  
Circulation pump    Separate on/off switch to allow for cooling without circulation. Circulates to engine’s carburetor and for dehumidifying intake air
Connection    Quick connect/disconnect tubing with tubing insulation 
Bench / Floor model    Floor model 
Voltage    115 or 220 volts AC
Frequency    50 or 60 Hz
Weight    98 kg (215 lbs)  
Dimension    35x45x150 cm (13.7×17.7×59 inches)
Shipping weight   105 kg (230 lbs) 
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SKU: AYA-52-50237.