9
The pump is not suitable for continuous work. Maximum time of continuous operation
should not be longer than 3 hours. After this time a 3-hour break is required. For this
reason, the pump is not fit for work in ponds where continuous working time is longer.
PUMP INSTALLATION:
Pumps which are the subject of this manual are immersible pumps i.e. they work in the
pumped water. The minimum level of immersion of the pump during operation is 25 cm.
The pump may pump at smaller immersion however, in this case the user should directly
supervise the operation of the pump. In the event of any interruptions in its work, power
supply of the pump should be immediately turned off.
The pump cannot work "dry" without water. "Dry" work will lead to destruction of the
machine. In this case repair will be possible only upon payment.
Pumps can be equipped with a float switch
– an electric controller automatically turning
the pump on and off, depending on the level of water.
When the water level increases the float switch, empty
inside, goes up along with the water level. After reaching
the level of turning on, the ball inside the float drops,
joining electric contacts, as a result of which the motor of
the pump starts to work. During pumping water out the
level of water goes down and so does the float. After
reaching the level of turning off, the falling ball inside the
float disconnects the contacts thus turning off the motor of
the pump. The level of turning on and off can be changed
by the user by adjusting cable length between the float
handle and the float switch.
The minimum cable length between the float handle and
the float switch must be more than 8 cm. Failure to comply with this
recommendation will
lead to damage of the float cable insulation. In this case repair of the pump will be
possible only upon payment. See fig.
Minimum dimensions of the emptied tank should make it possible for the float to move
freely in the pumped liquid, without knocking against the tank walls. In the case when the
float switch is suspended on the tank wall, the pump should work under direct
supervision of the user in order not to lead to a breakdown related to possible "dry" work.
Water from the pump flows out through a pressure stub pipe (See fig.).Pressure hose
should be put on the pressure stub pipe. One should fix it to the stub pipe with a steel
trim. When selecting a pressure hose, one should remember that final efficiency of the
machine depends on the diameter and length of the hose. The smaller the hose
diameter, and the greater the length, the smaller the efficiency at the end of the hose .
The same principle applies to the difference between water level in the tank we pump
from, and the level we pump to. The greater the difference in levels, the more reduced
the pump efficiency. Parameter specified as maximum lift height given in the specified
technical data determines the maximum pressure generated by the pump. At this
pressure the pump efficiency will be zero.
At plunging the pump in the emptied tank, one should lower it on a string fixed to the
pump handle.
