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3
Note:
In the tank is a factory-
pressurized rubber bag ("air charge");
this enables the drawing-off of small
amounts of water without starting the
pump.
1. Plug power cable in.
2. Open pressure line (open tap or
spray nozzle).
3. Check to see the water comes out!
6.2 Pump characteristic
curve
The pump characteristic curve shows
which pump capacity is possible in
dependance on the delivery head.
Pump characteristic curve at 0.5 m suc-
tion head and 1" suction hose – for
model:
HWW 5500/20 M, …/50 M
A
Danger!
Prior to all servicing:
Unplug.
Ensure that pressure is relieved
from equipment and connected
accessories.
Repair and maintenance work other
than described here must only be car-
ried out by qualified specialists.
7.1 Periodic maintenance
Check equipment and accessories,
especially electrical parts and parts
under pressure for possible dam-
age; have repaired, if necessary.
Check suction and pressure lines for
leakages.
If the pump capacity lessens clean
suction strainer and filter cartridge (if
installed), replace if necessary.
Check air charge of tank, increase if
necessary (see "Increasing the air
charge").
7.2 Danger of freezing
A
Caution!
Frost damages the pump and
accessories, as both always contain
water!
When there is danger of freezing,
dismount equipment and accesso-
ries and store at a freeze-proof loca-
tion (see below).
7.3 Equipment dismounting
and storing
1. Unplug.
2. Open pressure line (open tap or
spray nozzle) and drain water com-
pletely.
3. Drain pump and tank completely. To
do so,
remove the drain plug from the
pump (except HWW 3300/20 K),
loosen the union nut of the flexi-
ble metal hose at the tank.
4. Disconnect suction and pressure
lines from the equipment.
5. Store equipment in a frost-free
space (at least 5 °C).
A
Danger!
Prior to all servicing:
Unplug.
Ensure that pressure is relieved
from equipment and connected
accessories.
8.1 Fault finding
Pump does not run:
No mains voltage.
Check cables, plug, outlet and
mains fuse.
Mains voltage too low.
Use only extension cables with
sufficient lead cross section (see
"Technical Specifications").
Motor overheated, motor protection
relay tripped.
After cooling off the pump will
switch ON again.
Ensure sufficient ventilation, keep
vent slots clear.
Observe max. temperature of the
pumped medium.
Motor hums but does not start.
With the motor switched OFF, put
screwdriver or similar through the
fan cover's vent slots and turn the
fan.
Pump blocked or out of order.
Disassemble pump and clean.
Clean diffusor, replace if neces-
sary.
Clean impeller, replace if neces-
sary.
Pump does not prime correctly or
runs very noisily:
Lack of water.
Ensure there is a sufficient water
supply.
Suction line leaky.
Seal suction line, tighten screw
fittings.
Suction head too high.
Observe max. suction head.
Install check valve, fill suction line
with water.
Suction strainer (accessory)
blocked.
Clean, replace if necessary.
Check valve (accessory) blocked.
Clean, replace if necessary.
Water leaks between motor and
pump, Duocone seal worn.
Replace Duocone seal.
Pump blocked or out of order.
see above.
Pressure too low or pump running
continuously:
Suction line leaky or too much suc-
tion head.
see above.
Pump blocked or out of order.
see above.
Pressure switch misadjusted.
Check cut-in and cut-out pres-
sure, readjust if necessary.
Pump starts after only a minimal
amount of water (approx. 0.5 l) has
been drawn off.
Air charge in tank too low;
increase.
Water
drips form air charging valve.
Rubb
er bag in tank leaky;
replace.
8.2 Pressure switch adjust-
ment
If – during time – the factory-set cut-in
and cut-out pressure changes consider-
ably, it can be readjusted to the original
setting (see "Technical Specifications").
B
Danger!
Risk of electric shock when
touching the terminal inside the pres-
sure switch. Only qualified service
technicians are permittted to open
and adjust the pressure switch.
1. Remove the pressure switch cover.
2. Open pressure line (open tap or
spray nozzle) and drain water com-
pletely.
When the pumps starts, note cut-in
pressure indicated by the pressure
gauge.
3. Close pressure line.
When the pumps stops, note cut-out
pressure indicated by the pressure
gauge.
7. Care and Maintenance
8. Trouble Shooting
12

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