User manual
iSave 21
21
180R9221 / 521B1174 / DKCFN.PS.003.A1.02
Filter
3
m nom.
Media filter
HP pump
main filter
M
Fresh water /
perteate flush
Full flow
cleaning
Permeate
Brine/concetrate
VFD
iSave
Full flow
cleaning
M
F
Flowmeter
F
Flowmeter
11
1
4
3
12
13
15
8
HP in
HP out
LP out
LP in
F
Flowmeter
6
9
16
Drain
5
7
10
14
17
2
18
19
5.16 Preferred system design and P&ID
Explanation of P&ID setup
• The pressure switch (3) must stop the iSave (11) and the high-pressure pump (4) at pres
-
sures lower than the minimum inlet pressure or higher than the allowable maximum
pressure.
• The non-return valve (18) prevents the high pressure flow from the membrane to flow
back through the HP pump and into the low pressure piping. This may occur when the
high pressure pump stops.
• The pressure relief valve (6) protects the entire system against pressure overload and
relieves the water if the pressure exceeds the maximum set pressure.
If the high pressure pump is a positive displacement pump, the pump can build up a very
high pressure that will exceed the mechanical strength of the membrane housing, pipes
and other accessories.
• The valve (8) bleeds the air out of the system. The valve must be placed at the highest
point in the system.
• The pressure relief valve (19) protects the low pressure pipes against pressure overload
and relieves the water if the pressure exceeds the maximum allowable pressure.
• Inlet filters assure proper water quality. High quality water extends the service life of the
whole system.
• The pressure switch (13) must stop the iSave when the pressure is lower than the mini
-
mum inlet pressure or higher than the maximum pressure.
See “Start and stop” procedure, “Membrane cleaning” procedure and “iSave overload pro-
tection” instruction in appendices 10.1, 10.2. and 10.5.
Summary of Contents for iSave 21
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Page 59: ...User manual iSave 21 59 180R9221 521B1174 DKCFN PS 003 A1 02 10 4 iSave part list...
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Page 61: ...isave danfoss com iSave 21 Parts list 180R9209 DKCFN PC 003 A2 02 Parts list...
Page 66: ...Parts list iSave 21 Parts list 6 180R9209 DKCFN PC 003 A2 02 03 2011 Exploded view Vane pump...
Page 68: ...Parts list iSave 21 Parts list 8 180R9209 DKCFN PC 003 A2 02 03 2011 Exploded view iSave...
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Page 71: ...User manual iSave 21 71 180R9221 521B1174 DKCFN PS 003 A1 02 10 5 iSave overload protection...
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