Starting The Pump; Shaft Seal Run-In; Operating Conditions; Maximum Number Of Starts And Stops - Grundfos TPE2 D Manual Del Usuario

10.3 Starting the pump

1. Before starting the pump, completely open the isolating valve
on the inlet side of the pump and leave the outlet isolating
valve almost closed.
2. Start the pump. See section
3. Vent the pump by loosening the vent screw in the motor stool
until a steady stream of liquid runs out of the vent hole. See
fig. 23.
WARNING
Escaping hot or cold liquids
Death or serious personal injury
- Pay attention to the direction of the vent hole, and
make sure that the escaping hot or cold liquid does
not cause injury to persons or damage to the
equipment.
- Wear personal protection equipment.
4. When the pipe system has been filled with liquid, slowly open
the outlet isolating valve until it is completely open.

10.4 Shaft seal run-in

The seal faces are lubricated by the pumped liquid, meaning that
there may be a certain amount of leakage from the shaft seal.
When the pump is started up for the first time, or when a new
shaft seal is installed, a certain run-in period is required before
the leakage is reduced to an acceptable level. The time required
for this depends on the operating conditions, i.e. every time the
operating conditions change, a new run-in period will be started.
Under normal conditions, the leaking liquid will evaporate. As a
result, no leakage will be detected.
However, liquids such as kerosene will not evaporate. The
leakage may therefore be seen as a shaft seal failure.
12. User interfaces.

11. Operating conditions

11.1 Maximum number of starts and stops

The number of starts and stops via the power supply must not
exceed four times per hour.
When switched on via the power supply, the pump will start after
approximately 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting or stopping the pump.
When started via an external on/off switch, the pump will start
immediately.

11.2 Alternating operation of twin-head pumps

On twin-head pumps, the duty and backup pumps must be
alternated on a regular basis, i.e. once a week, to ensure an even
distribution of the operating hours on both pumps. The pumps
alternate automatically. See section
(Setup of multi-pump system).
If twin-head pumps are used for pumping domestic hot water, the
duty and backup pumps must be alternated on a regular basis,
i.e. once a day, to avoid blocking of the backup pump due to
deposits such as calcareous deposits. The pumps alternate
automatically. See section 17.51 "Multipump setup" (Setup of
multi-pump system).

11.3 Liquid temperature

-13 °F (-25 °C) up to +248 °F (+120 °C)
The maximum liquid temperature depends on the shaft seal type
and the pump type.
Depending on the cast-iron version and the pump application, the
maximum liquid temperature may be limited by local regulations
and laws.
The maximum liquid temperature is stated on the pump
nameplate.
If the pump is used for liquids at high temperatures,
the life of the shaft seal and the built-in Grundfos
sensor may be reduced.

11.4 Ambient temperature

11.4.1 Ambient temperature during storage and
transportation
Minimum: -22 °F (-30 °C).
Maximum: 140 °F (60 °C).
11.4.2 Ambient temperature during operation
3 x 200-240 V
Minimum -4 °F (-20 °C)
Maximum 104 °F (40 °C)
The motor can operate with the rated power output, P2, at
122 °F (50 °C), but continuous operation at higher temperatures
reduces the expected product life. If the motor is to operate at
ambient temperatures between 122 and 140 °F (50 and 60 °C),
select an oversized motor. Contact Grundfos for further
information.
17.51 "Multipump setup"
.
1 x 200-240 V
3 x 440-480 V
-4 °F (-20 °C)
122 °F (50 °C)
19