Homa H500B/7,5 DA [12/24] Start up
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Homa H500B/7,5 DA [12/24] Start up

Homa H500B/7,5 D [12/24] Start up
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The stop level must be adjusted in such a way, that the
pump stops before the liquid level is lowered below the
top of the pump volute.
The start level must in any case be below the bottom of
the liquid inlet pipe of the pit.
The high alarm level, if a separate float switch for that is
installed, should be adjusted approx. 10 cm above the
start level, in any case it must be below the bottom of the
liquid inlet pipe of the pit, so that the start level must be
adjusted accordingly.
Never place the float switch in the sump without fixing the
float switch cable to a fixed point in the sump, because
the float switch needs a rotation around the fixing point of
the cable to operate without any problems. Non-
observance may cause an overflow because the pump
does not start running or a dry run of the pump in fact that
the pump does not stop, which will destroy the pump.
Note: Only the proper adjustment and fixing of the float
switch cable will guarantee a reliable pump operation. Af-
ter any modification of the float switch adjustment the
function must be checked by a test-run of the pumps.
8. Start-Up
Never let the pump run dry for a long time of
period, as it will destroy the pump (danger of overheat-
ing).
If necessary, check the direction of rotation of the
pump, as described under 6.4. Put the switch on
the control box to the required mode of operation.
Models without a float switch start running.
Models with float switch start running when the float
switch is raised by the water level to its on position, and
shut off when the float switch is lowered by the water level
to its off position. For a pump operation without the float
switch turn the switch in to the position „Hand“. If the me-
dium is pumped down return the switch into the position
"Auto".
9. Maintenance and Repair
In case of a defect of the pump, a repair shall be car-
ried out only by the manufacturer or through an author-
ized workshop. Modifications of the pump must be con-
firmed by the manufacturer. Only HOMA spare parts shall
be used.
In accordance with the product liability law we point
out that we shall not be liable for damages caused by our
product due to unauthorized repair by persons other than
the manufacturer or an authorized workshop or due to the
use of spare parts other than original HOMA parts. The
same product liability limitations are valid for accessories.
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Before maintenance or repair make sure that all rotat-
ing parts stand still!
Before carrying out maintenance and service, the
pump must be thoroughly flushed with clean water. Rinse
the pump parts in clean water after dismanteling.
At pump types with oil chamber an overpressure can
escape with loosening of the oil chamber control screw.
Screw only when pressure balance took place.
Pumps running under normal operation conditions should
be inspected at least once a year. If the pumped liquid is
very muddy or sandy or if the pump is operating continu-
ously, the pump should be inspected every 1.000 operat-
ing hours.
For long and trouble-free operation of the pump, following
points should be checked regularly:
- Nominal current (A):
Check with amp-meter.
- Pump parts and impeller:
Check for possible wear.
Replace defective parts.
- Ball bearings: Check the shaft for noisy or heavy opera-
tion (turn the shaft by hand). Replace defective ball bear-
ings. A general overhaul of the pump is usally required in
case of defective ball bearings or poor motor function.
This work must be carried out by an authorized
service workshop.
- Cable entry
: Make sure that the cable entry is watertight
and that the cables are not bent sharply and/or pinched.
Additionally at pump types with oil chamber:
- Oil level and oil condition in oil chamber:
Put the pump in horizontal position, so that the screw of
the oil chamber is above (at larger pumps: one of both
screws). Remove the screw and infer a small quantity of
oil. The oil becomes greyish white like milk if it contains
water. This may be the result of defective shaft seal.
In this case leave the condition of the shaft seals by a
HOMA Service to examine.
The oil should be replaced after 3000 operating hours.
Oil type: Shell Tellus C22, degradable HOMA-Atox (avail-
able on request). Used oil is to be disposed accordingly.
Servicing Contract
For a regular expert execution of all necessary mainte-
nance and inspection we recommend the conclusion of a
servicing contract by our HOMA Service. Please contact
our HOMA customer service.

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