English (GB)
6
If the liquid temperature falls below the ambient temperature,
condensation may form in the motor during standstill. In this case,
make sure that one of the drain holes in the motor flange is open
and points downwards. See fig.
.
Fig. 6
Drain hole in motor flange
If twin-head pumps are used for pumping liquids with a
temperature below 0 °C (32 °F), condensed water may freeze
and cause the coupling to get stuck. You can solve the problem
by installing heating elements. Whenever possible, install the
pump with the motor shaft in horizontal position. See fig.
6.1 Pipework
Fit isolating valves on either side of the pump to avoid draining
the system if the pump needs to be cleaned or repaired.
The pump is suitable for pipeline mounting, provided that the
pipework is adequately supported on either side of the pump.
Single-head pumps are designed for pipeline mounting only.
Twin-head pumps are prepared for installation on a mounting
bracket or base plate.
When installing the pipes, make sure that the pump housing is
not stressed by the pipework.
The inlet and outlet pipes must be of an adequate size, taking the
pump inlet pressure into account.
To avoid sediment build-up, do not fit the pump at the lowest point
of the system.
Install the pipes so that air locks are avoided, especially on the
inlet side of the pump. See fig.
Fig. 7
Correct pipework on the inlet side of the pump
If there is any risk of the pump running against a closed outlet
valve, ensure a minimum liquid flow through the pump by
connecting a bypass or a drain to the outlet pipe. The drain can
for instance be connected to a tank. A minimum flow rate of 10 %
of the flow rate at maximum efficiency is needed at all times.
Flow rate and head at maximum efficiency are stated on the
pump nameplate.
6.2 Terminal box positions
You can turn the terminal box to any position. Change the
terminal box position as follows:
1. Loosen the clamp securing the pump head to the pump
housing. See fig.
.
Fig. 8
Clamp (A)
2. Turn the pump head to the required position.
3. Check the following before the clamp is tightened:
– The contact face of the pump housing and that of the pump
head must be in full contact.
– The clamp must be positioned correctly in the flange recess
of both the pump head and the pump housing. See fig.
Torque: 8 Nm (± 1 Nm).
T
M
05
79
17
16
13
Caution
Observe the conditions in section
TM
0
0
2
263
0
195
Caution
The pump must not run against a closed outlet valve
or this will cause an increase in
temperature/formation of steam in the pump which
may cause damage to the pump.
Warning
Before starting work on the pump, make sure that the
power supply has been switched off for at least 5
minutes. Make sure that the power supply cannot be
accidentally switched on.
Warning
If the pump head has been lifted partly or completely
from the pump housing, pay special attention when
fitting the pump head again. See section
Warning
When loosening the clamp, do not drop the pump
head. See fig.
Warning
When loosening the clamp, there is a risk of
escaping vapour. See fig.
TM
06 07
21 081
4
A
