Aqua Medic Mistral II 2000, Operation Manual

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4.4. Installation
Connection to hose divider and air stones
One or more air stones can be connected to the unit‘s outlet with a hose and air diffuser. Choose an air hose
that suits your installation equipment, ensure all hoses are secured with clips when installing the air pump.
Using a larger diameter hose and avoiding kinks will improve the performance of this air pump. Use new and
sufficiently large air stones with enough discharge capacity. Place them no deeper than 3 m in the pond. Bends
in the air hose, air stones placed too deeply, air stones too small, old or dirty can reduce the pump’s power.
Never fully close the pump outlet. Ensure that the pump can discharge sufficient air all the time, otherwise the
pump will heat up leading to damage.
To prevent any water flowing back into the pump when turned off, we recommend to install the pump above
the water level. If a non-return valve is used on the outlet pipe, the pump may go beneath the waterline.
Please
take care never to place the pump into water. To guarantee a long service life, it is necessary to install the
pump under dry conditions, avoid moisture or dust. Dirt and moisture can seriously shorten the service life of
this pump
. Please note that an ambient temperature above +40 °C can cause the membrane to crack.
5. Remedy of faults
Fault Cause Remedy
Unit does not run. No voltage. Check the voltage.
The unit does not deliver any
air
or the amount is
insufficient.
The regulating valves are completely or
partially closed. Open the regulating valves.
The regulating valves are soiled. Clean the regulating valves.
The aeration stones are soiled. Clean the aeration stones.
The air filter is soiled. Replace air filter.
Membrane is defect. Replace membranes.
Unit is unusually loud. Valve or membrane is defect. Replace valve or membranes.
6. Maintenance and cleaning
Replace air filter: Remove protective cover (Fig. F, No. 8). Remove and replace air filter (Fig. F, No. 9). Refit
protective cover (Fig. F, No. 8) and let it snap into place.
6.1. Replace membranes
Attention! Dangerous electrical voltage. Possible consequences: Death or serious injuries.
Protective measures: always unplug the unit prior to carrying out work on the unit.
Never operate the unit with defective membranes. Even if only one membrane is defect, always replace both of
them. The procedure is identical (Fig. G-I). Please contact your dealer if you do not wish to undertake the
replacement yourself.
Undo screws (Fig. G, No. 10) and remove the upper part of the housing (Fig. G, No. 11) from the bottom part
of the housing (Fig. G, No. 12). Undo screws (Fig. H, No. 14) on the valve unit (Fig. H, No. 15). Lay the screws
aside separately from the other screws.
Tilt valve unit (Fig. H, No. 15) to the side. Remove screw (Fig. I, No. 16) including washer (Fig. I, No. 17) from
the retaining ring (Fig. I, No. 18). Pull off the retaining ring (Fig. I, No. 18) including cover (Fig. I, No. 19).
Remove membrane socket (Fig. I, No. 21). Press on the membrane (Fig. I, No. 20) to release it out of
membrane‘s socket (Fig. I, No. 21). Insert new membranes. Reassemble the unit in reverse order.
6.2. Storage at frost
When the unit is in continuous operation, it can remain in place at freezing temperatures. Otherwise, store the
unit indoors in a dry room at room temperature.
7. Wear parts
Air filters, valves and membranes are wear parts and, therefore, are not covered by our warranty.