Data sheet
Energy Recovery Device / iSave 21-40
11
521B1116 / DKCFN.PD.003.A4.02 / 01.2012
10.
RO systems with an
iSave
PID setup
Explanation of PID setup
A. Place inlet filters on LP string in front of the
iSave (11). Please consult section 7, “Filtration”
for guidance on how to select the right filter.
Thoroughly clean pipes and flush system
prior to start-up.
B. Place a monitoring pressure switch (3) set at
minimum inlet pressure between filter and
pump inlet. The monitoring switch must stop
the iSave (11) and the high-pressure pump (4)
at pressures lower than minimum inlet
pressure.
C. Dimension the piping to obtain minimum
pressure loss (large flow, minimum pipe
length, minimum number of bends/connec-
tions and fittings to prevent pressure loss and
flow turbulence). Use flexible hoses to
minimize vibrations and noise.
D. To balance the flow between high-pressure in
and low-pressure in, place a variable area flow
meter (12) on low- pressure inlet to the iSave.
E.
In order to eliminate the risk of damage and
cavitation, a positive pressure at the low-
pressure outlet from the iSave is always to be
maintained at minimum 1 bar (14.5 psig) and
maximum 10 bar (145 psig). It is recommen-
ded to install monitoring pressure switch (13)
in order to prevent high/low pressure.
F.
Install a VFD to control the speed of the iSave.
G. Install a pressure control valve (15) to control
pressure in low-pressure out.
H. Install an air bleed valve (8) on the highest
point of the high-pressure piping to make
sure air escapes the system in the bleeding
process.
I.
The pressure relief valve (6) protects the
whole system against pressure overload and
relief the water if the pressure exceeds the
maximum set pressure.
If the high pressure pump is a positive
displacement pump, the pump can built up a
very high pressure that will exceed mechani-
cal strenght of the membrane housing, pipes
and other accessories.
J.
The pressure relief valve (19) protects the low
pressure pipes against pressure overload and
relief the water if the pressure exceeds the
maximum allowable pressure.
For alternative PID setup, please contact Danfoss
RO-Solutions sales organisation.
11. Service
Provided that the iSave has been running
according to Danfoss specifications for pre-filtra-
tion, pressure and rotation speed, Danfoss RO
Solutions guarantees 8,000 hours service-free
operation, however maximum 18 months from
date of production.
After 8,000 hours of operation, Danfoss recom-
mends an inspection where worn parts, if any,
must be replaced.
If Danfoss RO Solutions recommendations
concerning system-design are not followed, it
can influence the life of the iSave.
The iSave is made of super duplex materials with
fine corrosion properties. However, it is always
required to flush the iSave when the system is
shut down. See start/stop instruction 521B1133.
11.1 Periodic maintenance
Declining performance will require inspection of
the iSave.
11.2 Repair
In case of irregular function of the iSave, please
contact the Danfoss RO Solutions sales organisa-
tion.
Summary of Contents for iSave 21
Page 5: ...User manual iSave 21 5 180R9221 521B1174 DKCFN PS 003 A1 02 1 CE Declaration of conformity...
Page 32: ...User manual iSave 21 32 180R9221 521B1174 DKCFN PS 003 A1 02...
Page 38: ...User manual iSave 21 38 180R9221 521B1174 DKCFN PS 003 A1 02...
Page 43: ...User manual iSave 21 43 180R9221 521B1174 DKCFN PS 003 A1 02 10 3 Data sheet...
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Page 59: ...User manual iSave 21 59 180R9221 521B1174 DKCFN PS 003 A1 02 10 4 iSave part list...
Page 60: ...User manual iSave 21 60 180R9221 521B1174 DKCFN PS 003 A1 02...
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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