Technical Modification; Fault, Possible Reason And Recovery - Zehnder EP 11-3 Manuel D'utilisation

This warranty does not cover damage cause by improper use or wear and tear (mechanical seal, diaphragm, at booster kits). Also, there will
be no warranty given in case of unauthorised repair of the pump. Consequential damages caused by failing of the pump are not covered by
the manufacturer.
7. Disposal
For EU-countries only. Do not dispose the pump into the domestic waste.
In accordance to the European guideline 2002/96/EG concerning electrical and electronic equipment and implanting into
national law used electrical tools have to be collected separately and supplied to an environmentally compatible recycling.

8. Technical Modification

... without prior notice.

9. Fault, possible reason and recovery

Faults
1. Pump does not suck in
2. Pressure decrease suddenly
3. Pump switches on/off in short
intervals
4. Pump does not switch off
5. Pump switches off
6. Leakage between pump housing and
motor
Before sending back a pump or a booster- kit, check the above mentioned items, please.
Back sending to the manufacturer Carriage paid with original wrapping:
Zehnder- Pumpen GmbH
Zwönitzer Str. 19
D - 08344 Grünhain-Beierfeld
Please tell us the failure mode of the unit, as this will reduce the waiting time and also put the proof of purchase inside.
Possible reasons
Pump housing is not filled with water
Suction connection not tight
Pump sucks in air
Suction height to long (max. 8.5m)
Suction hose is shrinked
Motor protector activated overheating,
blocking, voltage fault or any other error
Foot valve with sucking side is missing or
leaky
Diaphragm in vessel damaged
(Leakiness at the air valve)
To less pre- pressure in diaphragm vessel
Pressure switch set wrong
Foot valve with sucking side is missing or
leaky
Pressure switch damaged
Pump will not exceed switch off pressure.
Switch off pressure at the pressure switch
adjusted to high
Pressure switch defect
Motor overheated, triggering of the
thermal motor protection
Power failure
Mechanical seal damaged
Possible frost damage
14
Recovery
Fill the pump chamber with water
Thread connections tight with Teflon
coated sealing tape or hemp
Use a special coupling
Reduce the sucking height
Use a spiral hose
Check, consult the customer service
Install foot valve, check or clean
Renew the diaphragm (expendable part)
Produce the necessary air pressure (see
ch. 4)
Pressure switch justify so that a
difference of 2bar between switch on and
switch off pressure (see ch. 4)
Clean and reinstall foot valve
Renew pressure switch
Check pre- filter and pump hydraulic
(impeller) of contamination and if
necessary clean
Decrease the switch off pressure
Replace the pressure switch
Motor switches on after cooling down
automatically
Check power supply, fuse
Renew mechanical seal
In most instances the pump is damaged
beyond repair
a) Motor flange is warped
b) Sealing support deformed
c) Cleat of the end shield demolished
GB