Pipes; Operating; Terminal Box Positions - Grundfos TPE2 D Manual Del Usuario

Twin-head pumps installed in horizontal pipes must be fitted with
an automatic air vent in the upper part of the pump casing. See
fig. 5.
The automatic air vent is not supplied with the pump.
Fig. 5 Automatic air vent
If the liquid temperature falls below the ambient temperature or
the pump is installed outside, 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.
6.
Fig. 6 Drain hole in motor flange
If twin-head pumps are used for pumping liquids with a
temperature below 32 °F (0 °C), 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 motor shaft in horizontal position. See fig. 5.
Observe the conditions in section
conditions.

8.1 Pipes

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
pipes are 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 casing is not
stressed by the pipes.
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. 7.
Fig. 7
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.

8.2 Terminal box positions

11. Operating

You can turn the terminal box to any position.
Change the terminal box position as follows:
Correct pipes on the inlet side of the pump
The pump must not run against a closed outlet valve
as this will cause an increase in temperature or
formation of steam in the pump, which may cause
damage to the pump.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply to the motor and to the
signal relays. Wait at least 5 minutes before you
make any connections in the terminal box. Make
sure that the power supply cannot be accidentally
switched on.
WARNING
Hazardous liquids
Death or serious personal injury
- If the pump is used for a liquid which is injurious to
health, it will be classified as contaminated. In
such case, take proper precautions to avoid injury
to health when operating or working on the pump.
- Wear personal protection equipment.
WARNING
Falling objects
Death or serious personal injury
- If the pump head has been lifted partly or
completely from the pump casing, pay special
attention when fitting the pump head again.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Wear safety shoes.
- Pay special attention that the pump head does not
fall down when loosening the clamp. See fig. 8.
WARNING
Pressurised system
Death or serious personal injury
- Pay special attention to escaping vapor when
loosening the clamp. See fig. 8.
- Wear personal protection equipment.
11