Service & Maintenance - Zehnder EP 11-3 Manuel D'utilisation

The pump can be switched on now. If the suction-hose is very long the time for priming could be approx. 5 min.
If there is no delivery after this time, please check once again the connections at the suction side, also the hose may be buckled or damaged.
Other reasons therefore could be:
- There is air in the pump and the pump has to be filled with water completely once again
- Suction connection not tight, pump is sucking in air
- Strainer is blocked
- The suction hose/pipe heigth is too long - max. 8.5 m
To avoid damages of the pump hydraulics and seals, the pump must not run dry! Also it is forbidden to use the pump
against a closed valve.
Adjustment of the pressure- switch (booster- kits)
Always disconnect from the power before servicing and prevent it against accidental touch.
This switch is pre- adjusted to start the unit at approx. 1.8 bar and stop it approx. 3 bar.
Within this range, the pump works at its best efficiency. To change these values to increase/reduce the pressure, please proceed as follows:
- Remove the cover of the switch turning the nut of the small spring clockwise (counter-clockwise) will increase (reduce) the switching- off
pressure.
- Turning the nut of the large spring clockwise (counter-clockwise) will increase (reduce) the starting pressure.
- Close the switch, plug in and check the new values by controlling the pressure gauge.
- If the result is unsatisfactory repeat the procedure. Note that both springs are influenced mutual.
Please note that the changing of one switch point may be affected the other switch point and the switch on/- off- pressure should be
controlled in any case.
The switching-off pressure must be lower than the max. pressure.
ATTENTION
(see technical data or type plate). Otherwise the pump will never stop and could be damaged. The max. reachable
pressure calculated as follows: max. deliver lift according to the identification plate minus real suction lift. The
switch off pressure should be min. 5 m (0.5 bar) less than the max. within reach pressure of the pump.
When the switch- on pressure was changed has the air pressure been adjusted inside the diaphragm vessel. The air pressure must be approx
0.2 to 0.3 bar less than starting- pressure of the unit.
Procedure: Disconnect the power supply. Open the tap, that the system will be vented.
Remove the black cover at the rear of the tank and check the air pressure at the underlying valve with a pressure gauge.
If necessary reduce the air pressure or increase it by means of a foot operated pump.
After that the air pressure should be inspected once again.
5. Service / Maintenance
Always disconnect from power before servicing!
Service and repair at electrical parts of the pump (cable, motor) has to be done by authorised service- companies
or producer.
The air pressure inside the diaphragm tank should be controlled regularly every 3 months. Please also look at chapter 4, last subsection.
If the mechanical seal is damaged (dry- running and/or pumping abrasive parts) water will leak between pump- body and motor. To replace
this seal the 6 screws and the pump- body must be removed, impeller turned off/locking the shaft at the fan side). Replaced the seal and the
O-ring of the pump- body and assemble all parts in reverse order.
In case of very low temperatures and in any case before the first frost the pump must be removed from water. Empty the pump and store it in
a place where it is protected from frost.
For the purpose of a repair, service kits and service tools are available on request. You will find a typical overview about our service partners
at www.zehnder-pumpen.de.
We explicitly mention that spare parts and accessories which are not delivered and checked by Zehnder are not permitted. The built in and
use of such products may negatively affect the constructive set properties under these circumstances. For damages which arise by using of
non-original spare parts and accessories, Zehnder will refuse any liability and warranty. For faults which you cannot repair by yourself you
should contact our customer service or a qualified person.
6. Warranty
This pump carries a 24 month manufacturer warranty. The warranty period begins with the date of purchase by the end user. Proof of
purchase should be retained. Within this period we will remove all kind of shortcoming due to failures of material or assembling. It is up to
us either to repair or to replace the pump.
13
GB