Inspecting and cleaning the heat exchanger
The purpose of the heat exchanger is to provide a stable, clean and temperature controlled environment for the electronic circuitry inside the Transceiver Unit. The heat exchanger also inhibits dust and dirt particles from entering the transceiver. The powerful fans will draw dust and dirt particles into the unit. The fans must be inspected and cleaned at regular intervals
Prerequisites
The following specific tools are required for this task:
•  Vacuum cleaner (with plastic or rubber nozzle)
•  High pressure air supply (if necessary)
You will also need a commercially available mild detergent and a lint free cloth.
Context
Image
Note
During the years, the heat exchanger has been redesigned several times. Although its appearance has changed, the operational principles, use and maintenance actions have remained the same.
Procedure
1 Remove the front panel.
Remove the bolts indicated in the illustration.
Older types of heat exchangers have only four bolts to secure the front panel, one in each corner.
Note
The front panel can be tight because the insulation material used between the front panel and the cabinet have become sticky. You may need to apply some force to remove the panel. Use a block of wood and a small hammer to carefully loosen the panel.
2 Clean the unit.
•  Use a vacuum cleaner with a plastic or rubber nozzle.
•  Use a soft lint free cloth moistened with fresh water and a mild detergent.
•  Use high pressure air if necessary.
Note
For more dirty applications, compressed air or high pressure water flushing can be used provided maximum flushing pressure with a flat flushing nozzle is kept below 100 bar. Please observe that high pressure flushing must not be made directly against the plates!
3 Close the front panel.