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6 Circulation pump
The main pump is a very important component for the machine to function. It has a
direct impact on cleaning. If you suspect a problem or a reduction in function for this
component, replace it immediately.
6.1 Checking the circulation pump
Check the mounting for the pump so that it is secure and not making any noises during
operation. Check that the connections are tight and no water is leaking from the pump
house. Dosing with strong chemicals can damage the O-rings in the pump, causing
leakage. Careless handling of the pump during repairs can damage the ceramic shaft
seal, resulting in leakage.
7 Dosing system
The dosing system is a very important part of the process and the following inspection
points help ensure proper functioning. Defects can result in impaired cleaning or failure
to clean and/or calcium deposits developing.
7.1 Checking the hoses between pumps and containers
Hoses can harden and become brittle depending on which chemicals are used. Replace
the hoses regularly to avoid leaks.
7.2 Checking the dosage amount
Check the dosage amount to ensure that the correct amount is used according to the
manufacturer’s specications. Adjust as necessary according to the instructions.
The detergent/descaler in the containers may be corrosive. Wear safety
glasses and protective gloves.
• Pour 100 ml of detergent/descaler into a measuring glass and push the suction
hose down into it. Check that the suction hose and pump are full of detergent/
descaler. Run a program with dosing. Lift up the suction hose and check that
the correct amount has been used and that detergent/descaler is not forced back
when the pump stops. The amount used must conform to the manufacturer’s
recommendations.
• If dosing is incorrect on a machine with dosing via the steam generator, the back
valve of the steam generator must be inspected.
• Regarding the dosing amounts, see the container for the respective agent.
• The hose between the pump and the detergent container must be check yearly and
replaced every other year.
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