Homa H804 W [9/12] Installation

Homa H804 W [9/12] Installation
9
Submersible pumps used outside of buildings must
have a cable with a minimum length of 10m.
Make sure that the electrical pin-and-socket connec-
tions are installed flood- and moisture-safe. Before start-
ing operation check the cable and the plug against dam-
ages.
The end of the pump power supply cable must not be
submerged in order to prevent water from penetrating
through the cable into the motor.
H800 series Pumps are supplied with a plug or control-
box with integrated capacitor. If any other than an original
control-unit is used, please make sure that the thermal
relay in the motor starter is set acording to the nominal
current consumption of the pump motor (see data on
pump label).
Standard models have the sensors internally
connected, so that no external connection is necessary.
When the motor cools, it is switched on automatically.
7. Installation
Pay attention to the maximum depth of immersion
(see pump label).
If the pump is installed in a sump, the sump opening
must be covered with a tread-safe cover after installation.
The operator has to prevent damage through the
flooding of rooms caused by defects of the pump through
the use of appropriate measures (e.g. installation of alarm
units, backup pump or like that).
7.1 Installation
The pump may be installed with a flexible discharge hose
or a rigid pipe which were fixed at the discharge. We also
recomend the installation of a non-return valve. If a flexi-
ble hose is used, make sure that it does not buckle. Fix a
rope or a chain to the pump handle and lower the pump
into the liquid. If the pump is installed on muddy or sandy
ground, please make sure that the pump is hanging
30 cm over the ground.
7.2 Automatic Float Switch Control
They start and stop the pump according to the
liquid level in the pit.
The difference in level between start and stop must be
adjusted by adjusting the free swinging length of the ca-
ble between the float switch and the cable fastening.
Long cable end: Large difference in level.
Short cable end: Small difference in level.
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.
Never place the float switch in the sump without fixing the
float switch cable to a fixed point at the pump, 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 adjustement and fixing of the float
switch cable will guarantee a reliable pump operation.
After any modification of the float switch adjustment the
function must be checked by a test-run of the pump.
8. Start-Up
Never let the pump run dry for a long time of period,
as it will destroy the pump (danger of overheating).
Start the pump, and open the isolating valves if in-
stalled. Check the position of the float switches. Put the
switch on the control box to the required mode of opera-
tion.
9. Maintenance and Repair
In case of a defect of the pump, a repair shall be
carried out only by the manufacturer or through an au-
thorized workshop. Modifications of the pump must be
confirmed 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.

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