English
Installation and operating instructions Wilo domestic water systems Hxx
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checked to ensure compliance with the electrical
data of the domestic water system. The rating
plate data of the pump motor shall be complied
with for this purpose.
The mains fuse shall be a 10 A slow-blow fuse.
DANGER! Danger of death!
As a protective measure, the electrical system
shall be correctly earthed (i.e. in accordance
with the local regulations and conditions. Con-
nections provided for this purpose are marked
accordingly (earthing terminal on motor).
An electrical short-circuit would damage the
motor. The cables are never allowed to touch
the pipework or the domestic water system, and
they must be protected against moisture.
NOTE:
Never lift, transport or secure the domestic water
system by the mains connection cable. Do not
spray water directly at the pump.
Only for EM version:
When using an additional float switch, for example
for switching off the domestic water system in
case of low water, it must be connected according
to the diagram (Fig. 8, no. 3).
8 Commissioning
To avoid the pump running dry, it is necessary to
check before commissioning that there is enough
water in the open supply container or the well, or
that the supply pressure in the inlet pipe is at least
0.3 bar.
If a float switch or electrodes are used for protect-
ing against running dry, they must be positioned
so that the domestic water system switches off at
a water level which would result in air being
sucked in.
CAUTION!
The pump must not run dry. Dry running, even
for a short period, can result in damage to the
mechanical shaft seal. The manufacturer's war-
ranty does not cover damage to the pump
caused by running dry.
8.1 Check the diaphragm pressure vessel
In order for the domestic water system to operate
correctly, it is necessary to have a gas supply pres-
sure in the diaphragm pressure vessel that is
appropriate for the switch-on pressure. In the fac-
tory setting, the gas space of the diaphragm pres-
sure vessel is filled with nitrogen and set to a
particular supply pressure (see rating plate). The
gas pressure should be checked again before
commissioning and after changes to the pressure
switch settings. For this purpose, the domestic
water system must be de-energised and the dia-
phragm pressure vessel depressurised on the
water side. The gas supply pressure shall be
checked on the gas filling valve of the diaphragm
pressure vessel (Fig. 1, no. 9) by means of an air
pressure measuring instrument (Figs. 7a to 7c).
DANGER! Risk 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.
DANGER! Risk of injury!
Excessive gas supply pressure can lead to
destruction of the diaphragm pressure vessel.
The maximum permitted operating pressure on
the rating plate is not allowed to be exceeded.
The gas supply pressure must be monitored 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 reg-
ulations for working with pressure vessels.
The value of the gas supply pressure (PN2) should
be approx. the pump switch-on pressure (pE) less
0.2-0.5 bar (or pump switch-on pressure less
10%) (see Table 1)!
If the gas supply pressure is too low, it must be
corrected by replenishing gas. When replenishing,
it is recommended that nitrogen should be used
because this gas minimises the risk of corrosion in
the container, as well as preventing losses through
diffusion. If the gas supply pressure is too high,
correct it by venting gas from the valve.
Содержание Wilo-HMHI Series
Страница 2: ...Fig 1 2 3 9 5 4 1 6 8 7 Fig 2 12 14 11 10 13 14 11...
Страница 3: ...Fig 3 14 10 12 14...
Страница 5: ...Fig 7a Fig 7b Fig 7c Fig 8...
