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8.12 Chemical tank
This section is only relevant, if the AQpure system is
Note
equipped with a chlorination module. See fig. 5, pos.
6.
The chlorination module includes a sensor in the chemical tank.
The sensor detects when the volume in the tank has reached a
low level and when it is empty. The sensor signal is used to avoid
dry running of the dosing pump.
The system indicates the requirement for this maintenance task
with a warning or an alarm. See section:
alarms.
Position of the component
See fig. 9, pos. 21.
8.12.1 Safety instructions
Warning
Danger of personal injury due to contact with
chemicals!
Wear the stipulated personal protective equipment
(protective clothing, gloves, goggles, etc.) when
handling chemicals!
Observe the chemical manufacturer's safety data
sheets (MSDS) and safety instructions of the used
chemicals!
Chemical degradation of chlorine
The chemical degradation of chlorine in a sodium hypochlorite
solution is accelerated by the following factors:
•
high concentration of solution
•
high ambient temperature
•
UV light, if stored in transparent tanks
Chemical degradation of chlorine can lead to
insufficient disinfection performance of the sodium
hypochlorite solution!
Dilute the concentrated sodium hypochlorite solution
as soon as possible to the required concentration.
Caution
This reduces the risk of chemical degradation
significantly.
Store the solution protected from UV light.
Choose a storage location with low ambient
temperature.
8.12.2 Preparations
The following tools are required for this maintenance task:
•
clean funnel
•
clean bucket or canister
•
piece of cloth
•
chemically resistant gloves
•
tight-fitting protective goggles
•
screwdriver
•
wrench
8.12.3 Preparing the sodium hypochlorite solution
Read section:
8.12.1 Safety
instructions.
Softened water must be used for dilution. Otherwise
calcium carbonate can precipitate from the diluted
Caution
solution, which can cause damage to the dosing
pump and valves.
1. Put on chemically resistant gloves and tight-fitting protective
goggles.
2. Use a clean bucket for mixing.
3. The required sodium hypochlorite solution can be mixed as
follows:
– Mix 1 part of a 10 % sodium hypochlorite solution with 4
parts of clean and softened potable water.
– Mix 1 part of a 15 % sodium hypochlorite solution with 6.5
parts of clean and softened potable water.
The result is a solution of 2 % sodium hypochlorite, that can be
filled into the chemical tank of the chlorination module.
40
7.5 Warnings and
8.12.4 Refilling the chemical tank
Read section:
8.12.1 Safety
instructions.
21.1
21.3
Fig. 22 Filling the chemical tank
1. Unless the system is already stopped due to an active alarm,
stop the system by pressing the [Stop] button on the HMI.
Warning
Danger from running system!
Make sure, that the Grundfos Eye has stopped
rotating before starting any work on the system
components or lines!
2. Put on chemically resistant gloves and tight-fitting protective
goggles.
3. Carefully pull the chemical tank out of the system without
tensioning the connected lines, until it is easily accessible for
filling. See detail (21.1).
4. Remove the screw cap. See detail (21.2).
5. Remove the sealing cap. See detail (21.3). If necessary, use
the screwdriver carefully to lift the strainer.
6. Put the funnel into the tank and fill in the right chemical. See
detail (21.4).
7. When the tank is full, assemble in reversed order.
8. If the alarm of the maintained component is active, press the
[Reset] button on the HMI to restart the system. Otherwise
press the [Start] button to restart the system.
21.2
21.4
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