3
The pump and the entire connection system have to be protected from frost.
All connection lines have to be perfectly tight since leaking lines may affect the performance of the pump and
cause considerable damage. If required, please use a suitable sealant to make the installation airtight.
When tightening threaded connections, please do not apply excessive force which may cause damage.
When laying the connection pipes, you should make sure that the pump is not exposed to any form of weight,
vibration or tension. Moreover, the connection lines must not contain any kinks or an adverse slope.
5.2.
Installation of the pressure line
The pressure line conveys the liquids to be discharged from the pump to the point of withdrawal. To avoid
dynamic flow losses, one should use a pressure line having at least the same diameter as the pressure port (1) of
the pump. The pressure line to be used for this type of application is an appropriate flexible hose - for instance, a
specially designed drainage hose.
5.3.
Stationary installation
If the unit is used in a stationary installation, rigid pipes have proven to be the ideal choice for the pressure lines.
In this type of installation, we recommend that you incorporate a check valve (non-return valve) in the pressure
line immediately following the pump outlet so that no liquid will flow back after the pump cuts out. To facilitate
maintenance work, we also recommend the installation of a stop cock valve downstream of the pump and check
valve. This arrangement is beneficial in that closing the stop cock will prevent the pressure line from running dry
after the disassembly of the pump.
5.4.
How to set the floating switch
Please make sure that the pump will cut out as soon as the water level decreases and the
floating switch has reached the cut-out level.
Also, it must be made sure that the floating switch can move freely.
In the manual operation mode the pump (with adjusted float switch) must be constantly
monitored to avoid dry running.
The pump is equipped with a floating switch (2) causing the unit to cut in or out automatically as a function of the
water level as soon as the water level has reached, or dropped below, the cut-out level, the pump will cut out.
When the water level reaches or raises above the cut-in level, the pump will resume operation. The cut-in and cut-
out levels can be adjusted by shortening or lengthening the freely movable cable (3) of the floating switch. The
length of the cable can be set at the cable duct (4) located at the carrying handle (5) of the pump. In this regard,
the relevant part is the freely movable part of the cable leading from the cable duct to the floating switch. If this
length increases, the cut-out level will decrease, and the cut-in level will augment. Vice versa, if its length
decreases, the cut-in level will increase whereas the cut-out level will be lowered. Shall the pump continue to suck
beyond the automatic cut-out-level the float switch hast to be operated manually, e.g. by holding it in upright
position. To do this, you must remove the cable of the floating switch from the cable guide (4) at the side. Then
adjust the floating switch to the intended holder (13) underneath the cable guide by sliding the switch vertically
into the holder from above so that the cable pointes downside. Just in this operation mode the min. suction level
given in the technical data chart can be achieved. However, the pump must be constantly monitored to avoid dry
running.
5.5.
How to position the pump
When positioning the pump, please make sure that the max. submersion depth indicated in the technical data will
not be exceeded. Likewise, please make sure that the minimum self-priming level is not fallen short of. If
everything is properly set, the water level may decrease down to the minimum suction level once the pump is
operating. Please position the pump on solid ground. Avoid placing it on lose stones or sand. When positioning
the pump, please do make sure that the pump cannot tip over or sink into the ground with its intake openings (6).
The penetration of sand, mud or comparable matters is to be avoided. To position, lift up or carry the pump,
please use only the carrying handle. If required for lowering or raising the pump, you may connect a suitable
lowering rope to the carrying handle. In no case must the pressure hose, the mains cable or the cable of the
floating switch be used to position, to lift up or to carry the pump.
5.6.
Installing and detaching the support system and the protection grille
For some applications - e.g. for the recirculation of water in ponds - it is recommended to install the pump
horizontally so that the pressure port (1) is aligned vertically upwards. Therefore, the scope of delivery of this
model includes a specially developed support system which must be used with this kind of installation of the pump
since it ensures the required standing stability. The horizontal installation must only be made after this support
system has been attached. The protection grille (13), which is also included in the scope of delivery and pre-
installed, efficiently prevents inhabitants of the pond from being sucked in; it has to be attached to the pump if it is
used in a pond with a pond population. As long as the pump is used in applications where the use of the
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Содержание DTX 7500 T
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