Grundfos SCALA2, Инструкция по установке и эксплуатации

Страница: 11 / 52

English (GB)
11
4.3 How to set the correct pressure
The pump can be set to provide a water pressure
between 1.5 to 5.5 bar (22 to 80 psi) at intervals of
0.5 bar (7 psi).
The factory setting is 3 bar (44 psi). See section
3.2 System sizing
.
4.3.1 Boosting from a well or a tank
If you are boosting from a well or a tank, make sure
not to set the pressure setpoint too high. The
difference between the inlet pressure and outlet
pressure must not exceed 3.5 bar (51 psi).
Fig. 10 Boosting from a well or a tank
4.3.2 Boosting from the mains
The pressure settings 4.5, 5.0 and 5.5 bar (65, 73
and 80 psi) require a positive inlet pressure and
these settings must only be used when boosting
from the water mains.
Fig. 11 Boosting from the mains
4.3.3 Self-learning setpoint
If the pump cannot reach the user-defined pressure
setpoint, the self-learning function will automatically
lower the setpoint. See section
8.3.2 Self-learning
function
.
4.4 Shaft seal run-in
The shaft seal faces are lubricated by the pumped
liquid. A slight leakage from the shaft seal of up to 10
ml per day or 8 to 10 drops per hour may occur.
When the pump is started up for the first time, or
when the shaft seal has been replaced, 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, that is,
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.
The leakage is visible where the screws are mounted
on the base plate. If the unlikely event of an internal
leakage occurs, the liquid will be drained through the
bottom of the pump. Install the pump in such a way
that no undesirable collateral damage can arise.
We recommend to use the default
pressure of 3.0 bar (44 psi) which will suit
most applications.
The difference between the inlet pressure
and outlet pressure must not exceed 3.5
bar (51 psi).
Example: If the inlet pressure is 0.5 bar (7
psi), the maximum outlet pressure is 4 bar
(58 psi).
If you set the pressure too high, this might
cause the pump to operate for up to three
minutes after the tap is turned off.
Maximum setpoint [bar (psi)]
Well application 3.0 (44)
Tank below ground level 3.5 (51)
Tank above ground level 4.0 (58)
T
M
07
00
75
41
17
T
M
07
00
76
41
17
TM
07
00
74
41
1
7