English (GB)
15
8.3 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.
.
4. When the pipe system has been filled with liquid, slowly open
the outlet isolating valve until it is completely open.
8.4 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.
9. Operating conditions
9.1 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
approx. 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting/stopping the pump.
When started via an external on/off switch, the pump will start
immediately.
9.2 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
.
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 (calcareous deposits, etc.). The pumps alternate
automatically. See section
14.47 Multipump setup (Setup of
9.3 Liquid temperature
-25 °C (~ -13 °F) up to +120 °C (~ +248 °F).
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.
9.4 Ambient temperature
9.4.1 Ambient temperature during storage and transportation
-30 - +60 °C.
9.4.2 Ambient temperature during operation
-20 - +50 °C.
The motor can operate with the rated power output, P2, at 50 °C,
but continuous operation at higher temperatures will reduce the
expected product life. If the motor is to operate at ambient
temperatures between 50 and 60 °C, select an oversized motor.
Contact Grundfos for further information.
9.5 Operating pressure/test pressure
The pressure test has been made with water containing
anti-corrosive additives at a temperature of 20 °C (~ 68 °F).
9.6 Inlet pressure
To ensure optimum and quiet pump operation, the inlet pressure,
system pressure, must be adjusted correctly. See the table on
page
.
For the calculation of specific inlet pressures, contact the local
Grundfos company or see the data booklet for TP, TPD, TPE,
TPED, TPE2, TPE2 D, TPE3 and TPE3 D on Grundfos Product
Center (https://product-selection.grundfos.com/).
9.7 Electrical data
See sections
27. Technical data, single-phase motors
and
28. Technical data, three-phase motors
For specific motor data, see the motor nameplate.
9.8 Sound pressure level
The sound pressure level of the pump is lower than 70 dB(A).
9.9 Environment
Non-aggressive and non-explosive atmosphere.
Warning
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.
Note
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.
Pressure stage
Operating pressure
Test pressure
[bar]
[MPa]
[bar]
[MPa]
PN 6
6
0.6
10
1.0
PN 6/PN 10
10
1.0
15
1.5
PN 16
16
1.6
24
2.4
