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- Disassemble the pump and accessories and
store them in frost-free conditions (see the
following section) if there is a risk of frost.
8.3
Disassembling and storing the device
- Switch off the device. Disconnect the mains plug.
- Open the discharge line (open the water tap or
spray nozzle), allow water to drain off completely.
- Completely drain the pump (2) and vessel (3) as
follows:
- unscrew the water drain screw (5).
- remove the suction and discharge lines from the
device.
- store the device in a frost-free room (min. 5 °C).
8.4
Set pressure switch (HWW 3500/25 G
only. Contact the Metabo service team
for setting all other HWW models.)
Danger! Risk of electric shock at the
terminals on the pressure switch! Only
trained electricians should open the pressure
switch and carry out changes.
The pressure switch is pre-set on site for the most
common application areas and can be adjusted as
follows if required:
Note: Adjustment of the main pressure spring (11)
results in almost proportional changes in the cut-in/
cut-out pressure, the difference in pressure
remains unchanged. An adjustment of the
difference in pressure (12) only changes the cut-
out pressure, the cut-in pressure remains
unchanged.
1. Switch off the pump, turn off at the mains, and
ensure that no voltage is carried.
2. Remove the cover from the pressure switch.
3. Changing cut-in pressure: adjust main
pressure spring (11) (SW 9 mm; 1 rotation ca.
0.1 - 0.15 bar). This adjustment also changes
the cut-out pressure to a practically
proportional extent!
4. Changing cut-out pressure: adjust (12)
pressure difference. The cut-in pressure
remains unchanged.
5. Mount the cover on the pressure switch and
check professional installation.
6. Operate pump, check desired target value (7)
on the manometer.
7. Repeat steps 1-6 if necessary until the desired
values are set.
Caution! The stated maximum pressure of
the pump must not be exceeded. The cut-in
pressure of the pressure switch must always be at
least 0.2 bar over the precharge pressure of the
chamber (1.5 bar, see Chapter 9.4). To prevent
regular switching of the pump, the chosen
pressure difference should be as high as possible
(e.g. pre-set at ca. 1.8 bar).
f
9. Troubleshooting
Danger!
- Prior to all work on the device:
- Disconnect the mains plug.
- Ensure that the device and connected
accessories are depressurised.
9.1
Pump does not run
• No mains voltage.
- Check the on/off switch, cables, plug, socket
and mains fuse.
• Mains voltage too low.
- Use an extension cable with an adequate
conductor diameter.
• Motor overheated; motor protection relay has
tripped.
- After cooling the pump will switch ON again.
- Ensure that there is adequate ventilation,
keep air slots free.
- Observe the maximum supply temperature.
• Motor hums, but does not start.
- If repairs are required, see Chapter 11.
• Pump clogged or defective.
- Disassemble and clean the pump. Clean the
diffuser and replace if necessary. Clean the
impeller and replace if necessary. See
section 11.
• Line/inlet pressure greater than pump cut-in
pressure.
- A pressure regulator should be installed
upstream, see Chapter2.
10
9.2
Pump not drawing in correctly or
running very loudly:
• Lack of water.
- Ensure that there is an adequate supply of
water.
• Pump not sufficiently filled with water.
- See section 6.7.
• Suction line leaking.
- Seal the suction line, tighten the screw
couplings.
• Suction height too high.
- Observe the maximum suction height.
- Insert the check valve, fill the suction line with
water.
• Intake filter (accessories) obstructed.
- Clean and replace if necessary.
• Check valve (accessories) blocked.
- Clean and replace if necessary.
• Water discharge between motor and pump,
shaft seal leaking. (Minor discharge of water
(max. approx. 30 drops per day) is normal with
the use of shaft seals).
- Replace the shaft seal. See section 11.
• Pump clogged or defective.
- See section 9.1.
9.3
Pressure too low or pumps runs
continuously (continuous switch-on/
off):
• Suction line leaking or suction height too high.
- See section 9.2.
• Pump clogged or defective.
- See section 9.1.
• HWW...: pressure switch adjusted.
- Read off the switch-on and switch-off
pressure on the pressure gauge (7) and
check the values (see section 13 Technical
Specifications). Please contact Metabo
Customer Service if a modification is required.
See section 11.
• HWW...: pump starts up even after a small
volume of water is removed (approx. 0.5 l).
- Check whether the pilot pressure in the
pressure vessel is too low. Increase the
pressure if necessary. See section 9.4.
• HWW...: water is running out of the air valve.
- Rubber bellows in the pressure vessel are
leaking, replace them. See section 11.
9.4
Increasing the pilot pressure (only
HWW...)
If – in the course of time – the pump starts up even
after the removal of a small volume of water
(approx. 0.5 l), the pilot pressure in the vessel must
be restored.
Note: the vessel pilot pressure (air pressure)
cannot be read on the pressure gauge (water
pressure) (7).
1. Disconnect the mains plug.
2. Open the discharge line (open the water tap or
spray nozzle), allow water to drain off
completely.
3. Unscrew the plastic cap on the front face of the
pressure vessel; the air valve is located behind
it.
4. Mount the air pump or compressor hose with a
"tyre valve" connection and pressure gauge on
the air valve.
5. Pump up to the specified pilot pressure
(1.5 bar; see section 13. Technical
Specifications).
6. Connect the device again and check it works.
f
10. Accessories
Use only genuine Metabo accessories.
Use only accessories that fulfil the requirements
and specifications listed in these operating
instructions.
See www.metabo.com or the catalogue for a
complete range of accessories.
11. Repairs
Danger! Repairs to this device must be
carried out by qualified electricians only!
Please contact your Metabo service centre if you
have Metabo devices that require repairs. See
www.metabo.com for addresses.
For shipment: drain the pump and vessel
completely (see section 8.3).
You can download a list of spare parts from
www.metabo.com.
12. Environmental Protection
Observe the national regulations on
environmentally compatible disposal and on the
recycling of disused tools, packaging and
accessories.
Only for EU countries: never dispose of
power tools in your household waste! Used
power tools must be collected separately
and handed in for environmentally compatible
recycling in accordance with European Directive
2012/19/EU on waste electrical and electronic
equipment and its implementation in national legal
systems.
13. Technical Specifications
Explanatory notes on the specifications on page 3.
Subject to change in accordance with technical
progress.
The pump characteristic curve (diagram on page
3) shows the conveying capacity that can be
reached depending on the conveying height
(suction height 0.5 m and 1" suction hose).
E
= Electronics / dry run protection
V
= Check valve integrated on the suction
connection (8) of the pump
K
= Mains cable
U
= Mains voltage
f
= Frequency
P
= Rated input power
1
P
=Standby consumption
Standby
I
= Rated power
C
= Operating condenser
n
= Rated speed
F
= Max. conveying capacity
V,max
F
= Max. conveying height
h,max
F
= Max. conveying pressure
p,max
p
= Pressure switch switch-on pressure
1
p
= Pressure switch switch-off pressure
2
S
= Max. suction height
h,max
S
= Max. supply temperature
temp
T
= Ambient temperature
temp
S
= Splash protection class
1
S
= Protection class
2
S
= Insulation class
3
M
= Pump housing material
P
G = Grey cast iron
M
= Pump shaft material
R
M
= Pump impeller material
W
D
= Suction connection female thread
s
D
= Pressure connection female thread
p
T
= Vessel volume
V
T
= Max. vessel pressure
p,max
T
= Vessel pilot pressure
p,1
A
= Dimensions:
length x width x height
m
= Weight (with mains cable)
~
AC power
The technical specifications quoted are subject to
tolerances (in compliance with the relevant valid
standards).
Emission values
These values make it possible to assess the
emissions from the power tool and to compare
different power tools. The actual load may be
higher or lower depending on the operating
conditions, the condition of the power tool or the
accessories. Please allow for breaks and periods
for assessment purposes when the load is lower.
Arrange protective measures for the user, such as
organisational measures based on the adjusted
estimates.
Typical A-effective perceived sound levels:
L
= Sound-pressure level
pA
L
= Acoustic power level
WA
K
, K
=Uncertainty
pA
WA
L
= Guaranteed acoustic power level as per
WA(G)
2000/14/EC
Wear ear protectors!
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