English (GB)
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6.3.2 Setting the water flow rate
The water flow rate is shown at flowmeter (6), and can be
adjusted with water flow adjustment valve (8).
* Observe target value of specific gravity (SG). See section
6.4 Start-up and shutdown procedures
6.4.1 Start-up
1. Open water isolating valve (16a) and set pressure reducing
valve (10) to show 3-4 bar on gauge.
2. Make sure that the brine tank (A) is prepared according to
section
3. Open isolating valves (16b), (16c) and (16d).
4. At initial start-up or if the system was shut down for more than
4 weeks, regenerate the water softener manually. See section
.
5. Switch on power supply with mains switch (29). A start-up
timer will be initiated at display (28).
6. Adjust the water flow adjustment valve (8) to set the water
flow rate given in section
at the
flowmeter (6).
7. Set the brine pump (3) to achieve a brine solution with a
specific gravity (SG) of 1.02 using the Selcoperm test kit.
– See section
6.5.2 Checking the salinity of the electrolyte
– The brine pump (3) is regulated manually.
6.4.2 Shutdown
Short term shutdown (up to 4 weeks)
Use the [LEFT] key on control (28) to shut down the Selcoperm
system for a short term. See section
.
Shutdown up to six months
1. Switch off power supply at switch (29).
2. Isolate system from water supply with isolating valve (16a).
Shutdown for periods over six months
1. Switch off power supply at switch (29).
2. Fit hose from soft water sample valve (F) to electrolyte sample
valve (G).
3. Fit hose to product sample valve (H) and direct it to a suitable
discharge point.
4. Open product sample valve (H), electrolyte sample valve (G)
and soft water sample valve (F).
5. Flush system thoroughly for a period of 5-10 minutes.
6. Close soft water sample valve (F). The degassing column (2)
drains automatically through open product sample valve (H).
7. Close electrolyte sample valve (G).
8. Remove hose from soft water sample valve (F) and direct
hose from electrolyte sample valve (G) to a suitable discharge
point.
9. Open electrolyte sample valve (G) to drain electrolyser
cell (1).
10. Close all sample valves and remove hoses.
11. Isolate system from water supply with isolating valve (16a).
For further advice please contact Grundfos.
6.5 Checks during operation
6.5.1 Checking the water hardness
A properly functioning water softener (4) is crucial for the
efficiency and longevity of the Selcoperm system. High levels of
calcium carbonate in the electrolyte will lead to a visible
precipitation on the electrodes of electrolyser cell (1).
We recommend to perform this check with the Grundfos
Selcoperm test kit. See section
.
1. Take a sample of water from soft water sample valve (F).
2. Perform the test according to the test kit operating
instructions.
6.5.2 Checking the salinity of the electrolyte
Checking the specific gravity (SG) of the electrolyte
We recommend to perform this check with the Grundfos
Selcoperm test kit. See section
.
1. Flush a clean and dry measuring cylinder with electrolyte from
the electrolyte sample valve.
2. Fill the measuring cylinder with a sample from the electrolyte
sample valve.
3. Place the hydrometer in the measuring cylinder.
4. Take the reading from the hydrometer.
– Required SG reading see section
Adjusting the SG
The SG of the electrolyte is controlled by the amount of brine
injected into the softened water. The brine flow is controlled by a
digital dosing pump (3). For the operation of the pump, see the
manual of the pump. Increasing the flow of brine injected into the
softened water will increase the SG, and restricting the flow will
lower the SG.
Type
Factory-set
brine flow [l/h]*
Factory-set
water meter flow
[l/h]
Total product
flow [l/h]
125
1.7 - 2.1
19
20.7 - 21.1
250
3.4 - 4.2
38
41.4 - 42.2
500
6.8 - 8.2
75
81.8 - 83.2
1000
12 - 15.5
140
152 - 155.5
2000
24-30
285
309-315
Note
The values given above have to be kept and may
require adjustment at site due to salt quality, water
pressure, temperature and mains water flow rate.
Note
Product dosing pumps should be set to give the
desired chlorine at the point of injection.
Note
The frequency of the tests depends on the specific
application, and must be determined individually by
the customer.
Note
The salinity can be checked either by measuring the
conductivity with the Grundfos conductivity
measuring device or by measuring the specific
gravity with the Grundfos Selcoperm test kit.
See section
.
For details on the conductivity measuring device, see
data booklet: http://net.grundfos.com/qr/i/98721404
