Grundfos CR 45-1-1 User Manual

English (GB)
11
8. Startup
Fig. 21 Venting valve, standard and an optional solution with
hose connection.
Follow the instructions on page 34.
CR, CRI, CRN 1s to 5
For these pumps, we advise you to open the bypass valve during
startup, see fig. 22 for bypass valve location. The bypass valve
connects the suction and discharge sides of the pump, thus
making the filling procedure easier. Close the bypass valve again
when the operation is stable.
When pumping liquids containing air, we advise you to leave the
bypass valve open if the operating pressure is lower than 6 bar.
Close the bypass valve if the operating pressure constantly
exceeds 6 bar. Otherwise the material at the opening will be worn
because of the high liquid velocity.
8.1 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. Maintenance
Pump bearings and shaft seal are maintenance-free.
Motor bearings
Motors not fitted with grease nipples are maintenance-free.
Motors fitted with grease nipples should be lubricated with a high-
temperature, lithium-based grease. See the instructions on the
fan cover.
In the case of seasonal operation (motor is idle for more than
6 months of the year), we recommend you to grease the motor
when the pump is taken out of operation.
Depending on the ambient temperature, the motor bearings must
be replaced or lubricated according to the table below. The table
applies to 2-pole motors. The number of operating hours stated
for bearing replacement are guidelines only.
Intervals for 4-pole motors are twice as long as those for 2-pole
motors.
If the ambient temperature is lower than 40 °C, bearings must be
replaced/lubricated at the intervals mentioned under 40 °C.
Caution
Do not start the pump until it has been filled with
liquid and vented. If the pump runs dry, the pump
bearings and the shaft seal may be damaged.
TM05 1160 0611 - TM05 8098 1913
Warning
Pay attention to the direction of the vent hole and
take care to ensure that the escaping water does
not cause injury to persons or damage to the
motor or other components.
In hot-water installations, pay special attention to
the risk of injury caused by scalding hot water.
Warning
Before starting work on the pump, make sure that
all power supplies to the pump have been
switched off and that they cannot be accidentally
switched on.
Motor size
[kW]
Bearing replacement interval [operating hours]
40 °C 45 °C 50 °C 55 °C 60 °C
0.37 - 0.75 18000 ----
1.1 - 7.5 20000 15500 12500 10000 7500
Motor size
[kW]
Lubrication interval [operating hours]
40 °C 45 °C 50 °C 55 °C 60 °C
11 - 18.5 4500 3400 2500 1700 1100
22 4000 3100 2300 1500 1000
30-55 4000 3000 2000 1500 -
75 2000 1500 1000 500 -

Grundfos CR 45-1-1 Specifications

General

Brand	Grundfos
Model	CR 45-1-1
Category	Water Pump
Language	English