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9 Maintenance
WARNING! Danger due to electrical current!
Before conducting the check, de-energise the
domestic water system and secure it to prevent
it from being switched back on inadvertently.
The main components of WILO domestic water
systems are almost maintenance-free. The fol-
lowing checks are recommended at 3-monthly
intervals in order to guarantee the highest operat-
ing reliability with the lowest possible operating
costs:
• Check the diaphragm pressure vessel has the gas
supply pressure set correctly (Fig. 6). To do this,
de-energise the domestic water system and
depressurise the container on the water side.
DANGER! Danger of suffocation by nitrogen!
Measuring, replenishing and venting of nitrogen
at the diaphragm pressure vessel is only allowed
to be performed by qualified specialist person-
nel.
WARNING! Danger of personal injury!
Excessive pressure can cause the container to
rupture and lead to serious injuries! Monitor the
gas supply pressure by measuring during the
filling procedure. When measuring instruments
with different scale divisions (unit of dimension)
are used, it is essential to comply with the
instructions for converting!
Comply with the general safety regulations for
working with pressure vessels.
10 Faults, causes and remedies
Faults
Pump not running
Pump is running but not pumping
Pump is not pumping smoothly
Pressure is not adequate
Installation and operating instructions Wilo domestic water systems Hxx
Causes
No mains voltage
Fuse defective
Motor protection tripped
Pump not running smoothly
Pump blocked
Dry-running protection tripped, water
level too low
Pump defective
Incorrect direction of rotation
Supply voltage too low
Line or parts of the pump are blocked by
foreign bodies
Air in suction port
Air in the pump
Inlet pipe or suction line too narrow
Immersion depth of the foot valve too
low
Suction head too large
Incorrect pump selected
Incorrect direction of rotation
Flow rate too low, suction line or filter
blocked
Check valve not opened sufficiently
Foreign matter is blocking the pump
• The gas supply pressure (PN2) should approxi-
mately correspond to the pump switch-on pres-
sure (pE) less 0.2-0.5 bar or 10% of the pump
switch-on pressure (pE) (see Table 1). Deviations
from the prescribed value shall be corrected by
filling or venting gas. When replenishing, it is rec-
ommended that nitrogen should be used because
this gas minimises the risk of corrosion in the con-
tainer, as well as preventing losses through diffu-
sion.
• Check the pump for leaks.
CAUTION! Risk of damage to the domestic water
system!
If there is a risk of frost, the system must be
completely drained (including the diaphragm
pressure vessel). The drainage screw (Fig. 1,
no. 3) is located on the underside of the pump.
Prior to a long standstill (e.g. overwintering), the
domestic water system must be thoroughly
flushed through, completely drained and then
stored in a dry place.
Before recommissioning the system, check that
the pump shaft can turn freely (e.g. by turning the
fan wheel).
WARNING! Danger due to electrical current!
Before conducting the check, de-energise the
domestic water system and secure it to prevent
it from being switched back on inadvertently.
Following this, take the domestic water system
into operation (see section 8).
Remedy
Check fuses, float switch and cable
Renew fuse
Correct motor overload
Eliminate blockages of the pump
Eliminate blockage of the pump
Check water level and correct
Renew pump
Swap 2 phases of the mains connection
Check mains voltage, capacitor and
cables
Check and clean line and pump
Seal suction line
Fill the pump again
Install an inlet pipe or suction line with a
larger nominal diameter
Increase immersion depth of the foot
valve
Position pump lower
Install a more powerful pump
Swap 2 phases of the mains connection
Clean filter and suction line
Open the check valve
Clean pump
English
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