Nordmende 2401935EN0801 manual Maintenance, Regular checks, Rectifying faults

7 Maintenance

Regular servicing helps to maintain the operation of the humidifier.

!The following work must be carried out by qualified personnel.

7.1Regular checks

• Inspect the steam cylinder:

Are there any deposits in the steam cylinder?

⇒Remove the drainage strainer and flush the cylinder thoroughly with tap water (without chemical additives). Replace the strainer after cleaning.

•Are the electrodes worn?

⇒Replace the steam cylinder.

•Inspect all hoses (steam-, condensate- and water hoses), also inside the unit: Is the installation correct?

Are all clamps still fastened tightly?

•Inspect the intake and drainage valves:

⇒If worn or covered with scale deposits the valve must be replaced.

• Inspect the drainage cup. Clean or replace if necessary.

7.2Rectifying faults

The humidifier produces insufficient or no steam. Following causes are possible:

•The humidity controller is not demanding any steam production.

•There is no water in the steam cylinder because the water supply is interrupted.

•The filter or the nozzle in the inlet valve is blocked or damaged.

•The cylinder is worn out and needs to be replaced.

•The contactor coil is defective.

7.3Replacing the steam cylinder

The serviceable life of the steam cylinder depends on the actual operation time and the hardness of the tap water used. The cylinder should be replaced when the system message “U1/cylinder service” appears on the LED display (flashing green). Under certain circumstances the cylinder can still be used before it has to be replaced.

Proceed as follows:

• Empty the cylinder by pressing the drainage-button

! • Let the cylinder cool down

• For the following procedures the equipment must be disconnected from the power supply!

•Loosen the hose clamp on the head of the cylinder and then remove the steam hose. Remove the electrode plugs from the cylinder. Push the cylinder up and remove it.

•Check the seal O-ring in the cylinder admission and replace if necessary.

•To fit the new cylinder reverse above procedure.

•Connect the heating cables to the electrode pins according to the coloured dots (for cylinders up to 3 electrodes) respectively as shown in Fig. 7.1 (cylinders with 6 electrodes).

•Restart the humidifier according to section 6.1 (start-up).

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