Grundfos JP Basic Booster, Инструкция по установке и эксплуатации

Страница: 7 / 12

English (GB)
7
5. Start-up
5.1 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.
6. Adjustment
The JP Basic Booster comes with the following
factory settings in bar:
6.1 Calculating the cut-in and cut-out
pressures
The cut-in pressure is the sum of these variables:
• required minimum pressure at the highest
tapping point
• head from the pump to the highest tapping point
• pressure loss in pipes.
Recommended cut-out pressure:
cut-in pr 0.8 - 1.5 bar.
6.2 Adjusting the precharge pressure
When the pump cut-in pressure has been
determined, the required precharge pressure of the
diaphragm tank can be calculated. The precharge
pressure must be adjusted to 90 % of the cut-in
pressure.
See the installation and operating instructions for the
diaphragm tank.
Caution
Do not start the pump until it has been
filled with liquid.
Note
We recommend to fit a non-return valve
on the suction side of the pump.
Pump
Tank
precharge
pressure
Cut-in
pressure
Cut-out
pressure
JP Basic
Booster
1.9 2.0 2.8
Note
The cut-out pressure must not exceed
the maximum discharge pressure of the
pump.
Caution
When adjusting/reading the precharge
pressure, make sure that there is no
water pressure on the diaphragm tank
from the pipework.
Note
If the pressure switch setting is
changed, the precharge pressure must
be adjusted too.