To calculate the amount of solution required to clean an air cooler, calculate or find the cross-sectional area of the cooler and use 3 litres of cleaning solution per square metre or as table below:

For in-service cleaning of air cooler and air-side of turbochargers, a solution of 25% Air Cooler Cleaner in freshwater is recommended.

The appropriate dose of cleaner is then put in the dosing pot and injected up-stream of the air cooler in 10 minutes. After a further 10 minutes, a similar quantity of fresh water is injected to rinse off the emulsified deposits.

Rate and frequency of application depends mainly on the condition of the air coolers. However, when starting with the use of Air Cooler Cleaner, we recommend injection every 24 hours. After initial cleaning period, the cleaning effect should last for 48 hours of operational time. Although frequency of cleaning may vary, the calculated cleaning dose should remain the same.

This cleaning method is only recommended if approved by engine manufacturers.

Out of service cleaning
Handspray Cleaning - in this situation the engine must be stopped.

Open an appropriate air trunking inspection cover.

Open air cooler drain valves.

Using a pressure handspray, apply undiluted Air Cooler Cleaner all over the cooler coils. Allow the Air Cooler Cleaner to penetrate the deposits for a minimum of 1 hour, then use a high pressure lance or water jet to wash off the loosened deposits.

After satisfactory cleaning, and flushing through with fresh water, close air cooler drains.

Soak Method - this method may be used for machine parts with stubborn carbon deposits. Put parts to be cleaned into a bath of undiluted Air Cooler Cleaner and allow deposits to be broken down and loosened before removal, then rinse.

Unitor Air Cooler Cleaner Injection System

The engine manufacturer should be consulted before
installing injectors.

Large engines will normally require two injectors per cooler, but one injector is usually sufficient for medium and small engines.

1) Check that all valves are closed A, B & C.
2) Thoroughly mix up a 25% solution of Air Cooler Cleaner and fresh water and pour this into the dosing pot through the filter funnel, closing filter valve afterwards.
3) Open valve 'A' allowing compressed air to the injector nozzle.
4) Open valve 'B' and 'C' to balance trunking pressure in dosage vessel. Emulsion solution will now be drawn down into the injector and be atomised in the scavenge air trunking. It should take about 10 minutes to empty the dosage vessel.
5) Close all valves A, B & C.
6) After a residence time of 10 minutes, repeat sequence of operation above using one full dosing vessel of fresh water.
7) Repeat this procedure every 24 to 48 hours, depending on the requirements of the type of engine and sizes of air coolers.