Operation; Commissioning; Care And Maintenance; Checking The Tank's Pre- Charge Pressure - Metabo HWW 3000/ 20 S Manual De Instrucciones

ENGLISH
3. To reduce the time needed for prim-
ing you can also fill the suction line.
4. Replace the water filler plug, com-
plete with gasket.
5. Open pressure line (open tap or
spray nozzle) for any air to escape
during priming.
6. Start pump (see "Operation").
7. Turn pump OFF when water runs
out steadily.

6. Operation

Pump and suction line must be con-
nected and filled (see "Prior to Opera-
tion").
A
Caution!
The pump must not run dry.
Ensure there is always sufficient pump-
ing medium (water) available.

If the motor does not start, no pres-
sure is built up or similar effects are
evident, switch the pump OFF – and
try to resolve the fault (see "Trouble
Shooting").
Pump characteristic curve
The pump characteristic curve shows
which pump capacity is possible in
dependance on the delivery head.
(Pump characteristic curve for 0.5 m
suction head and 1" suction hose.)
(Pump characteristic curve for 0.5 m
suction head and 1" suction hose.)
6.1

Commissioning

Note: 
3

The pressure switch
 starts the pump when, by drawing
water, the water pressure in the tank
falls below the cut-in pressure;
 stops the pump when the cut-out
pressure is reached.
14
Note: 
3
In the tank is a rubber bag, fac-
tory-charged with air ("precharge pres-
sure"); this permits the drawing of small
amounts of water without the pump start-
ing up.
1. Plug power cable in.
2. Open pressure line (open tap or
spray nozzle).
3. Check to see that the water comes
out!

7. Care and Maintenance

Danger!
A
Prior to all servicing:
1. Turn OFF.
2. Unplug.
3. Ensure that pressure is relieved
from equipment and connected
accessories.
Service and repair work other than
described here must be left to quali-
fied specialists.
7.1 Checking the tank's pre-
charge pressure
The precharge pressure in the tank
needs to be checked every three
months.
Note: 
3
The precharge pressure can not
be taken from the pressure gauge.
1. Unplug.
2. Open pressure line (open tap or
spray nozzle) and drain water com-
pletely.
3. Unscrew the plastic cover on the
front side of the tank; the charging
valve is located behind itl.
4. Connect air pump or compressor hose
with a "car tyre" type connector and
pressure gauge to the charging valve.
5. Read the precharge pressure in the
tank from the pressure gauge. The
precharge pressure
between 1.2 and 1.8 bar. Inflate to
the rated precharge pressure if nec-
essary.
6. Plug pump in again and check func-
tion.
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 the pump and accessories
and store at a frost-free location
(see below).
7.3 Pump Dismounting and
Storing
1. Turn pump OFF and unplug.
2. Open pressure line (open tap or spray
nozzle) and drain water completely.
3. Completely drain pump and tank; to
do so remove the drain plug from
the underside of the pump.
4. Disconnect suction and pressure
lines from the pump.
5. Store equipment in a frost-free room
(at least 5 °C).

8. Troubleshooting

Danger!
A
Prior to all servicing:
1. Turn OFF.
2. Unplug.
3. 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.
must be
• 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 (optional acces-
sory) blocked.
• Clean, replace if necessary.