Danfoss PAH 2, Инструкция по установке, эксплуатации и обслуживанию

Страница: 35 / 80

Instruction Pump instruction PAH / PAHT 2-12.5
35 © Danfoss | DHS (im) | 2022.07 180R9379 | AQ188686503004en-000801 | PAH 2-12.5 |
2. System design 2.1 Closed-system design
A Inlet line:
Dimension the inlet line to obtain mini-
mum pressure loss (large flow, minimum
pipe length, minimum number of bends/
connections, and fittings with small
pressure losses) .
B Inlet filter:
Install the inlet filter (1) in front of the tank
(2) . Please consult the Danfoss filter data
sheet for guidance on how to select the
right filter .
C Monitoring pressure switch:
Install the monitoring pressure switch (3) in
front of the filter (1) . Set the maximum inlet
pressure to 2 barg (29 .0 psig) . The monitor-
ing pressure switch will stop the pump (5) if
inlet pressure is higher than 2 barg
(29 .0 psig), indicating that the filter element
must be changed .
D Monitoring temperature switch:
Install the monitoring temperature switch
(4) in the tank . Set the temperature value
according to technical data, item 4 . The
monitoring temperature stops the pump if
inlet temperature is higher than the set
value .
E Hoses:
Always use flexible hoses (6) to minimize
vibrations and noise .
F Inlet pressure:
In order to eliminate the risk of cavitation
and other pump damage, pump inlet
pressure must be maintained according to
specifications described in item 4, technical
data .
G Non-return valve (7):
Should be installed after the outlet to
prevent pump backspin, which may ruin
the pump .
H Pressure relief valve:
As the Danfoss PAHT pump begins to
create pressure and flow immediately after
start-up regardless of any counter pressure,
a pressure relief valve (8) should be
installed to prevent system damage .
I System water filling:
To ensure proper filtration of new water
(10) supplied to the system, always use the
filling valve (9) .
J Minimum level switch:
Install the minimum level switch (11) above
the outlet of the reservoir . The level switch
must stop the pump if the water in the
reservoir is below the switch, which
indicates that the reservoir is empty .
Reservoir
PI
System
PI
M
PI
System
PI
M
1
2
3
4
5 5
7
6
1
2
3
4
6 6 7
8
5
9
10
11