28
GB
8..
echnical Modification
… without prior notice.
9.. ault, possible reason and recovery
Faults
Possible reasons
Recovery
1. Pump does not suck in
Pump housing is not filled with water
Fill the pump chamber with water
Suction connection not tight
Pump sucks in air
Thread connections tight with Teflon
coated sealing tape or hemp
Use a special coupling
Suction height to long (max. 8.5m)
Reduce the sucking height
Suction hose is shrinked
Use a spiral hose
Motor protector activated overheating,
blocking, voltage fault or any other error
Check, consult the customer service
2. Pressure decrease suddenly
Foot valve with sucking side is missing or
leaky
Install foot valve, check or clean
3. Pump switches on/off in short
intervals
Diaphragm in vessel damaged
(Leakiness at the air valve)
Renew the diaphragm (expendable part)
To less pre- pressure in diaphragm vessel Produce the necessary air pressure (see
ch. 4)
Pressure switch set wrong
Pressure switch justify so that a
difference of 2bar between switch on and
switch off pressure (see ch. 4)
Foot valve with sucking side is missing or
leaky
Clean and reinstall foot valve
Pressure switch damaged
Renew pressure switch
4. Pump does not switch off
Pump will not exceed switch off pressure. Check pre- filter and pump hydraulic
(impeller) of contamination and if
necessary clean
Switch off pressure at the pressure switch
adjusted to high
Decrease the switch off pressure
Pressure switch defect
Replace the pressure switch
5. Pump switches off
Motor overheated, triggering of the
thermal motor protection
Motor switches on after cooling down
automatically
Power failure
Check power supply, fuse
6. Leakage between pump housing and
motor
Mechanical seal damaged
Renew mechanical seal
Possible frost damage
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
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.
