Product Overview; Technical Data; Transport And Storage; Hydraulic Connection - Grundfos DSS Montage- Und Betriebsanleitung

3.3 Product overview

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Fig. 1 Example of a DSS system
Pos. Description
1 Manual vacuum pump (suction aid)
2 Suction-side isolating valve
3 Suction-side pulsation damper
4 Dosing pump
5 Suction-side isolating valve for dosing pump
6 Dosing pump (standby)
7 Suction-side isolating valve for dosing pump (standby)
8 Drip tray
9 Drain/flush valve
10 Safety valve for dosing pump (standby)
Discharge-side isolating valve for dosing pump
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(standby)
12 Safety valve for dosing pump
13 Discharge-side isolating valve for dosing pump
14 Discharge-side pulsation damper
15 Pressure-loading valve
16 Discharge-side isolating valve

4. Technical data

The values stated in the technical data of the
components must be observed.
Caution
For the entire system, the value of the component
with the most limited value applies.
The dosing medium must be in liquid state. Observe
Caution
the freezing point of your dosing medium.
Refer to the installation and operating instructions of the dosing
pump and characteristic of the dosing medium.

5. Transport and storage

Transport the DSS system carefully and only at
temperatures above 5 °C.
Caution
Risk of breakage.
The DSS system is tested for tightness in the factory.
Note Some residual water may still be present in the
fittings and pipes.
• Check the DSS system for transportation damage or missing
parts.
• Store the DSS system in a sheltered place at temperatures
between 5 and 45 °C.
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6. Installation
Warning
Make sure that the room where the DSS system is
installed has sufficient ventilation.
Warning
Protect the DSS system against unauthorised
access.
The dosing medium must be in liquid state. Observe
Caution
the freezing point of your dosing medium.
Keep the DSS system freely accessible for operation
and maintenance.
Note
Provide sufficient lighting.

6.1 Hydraulic connection

Mount the DSS system with a support on a wall, or on a suitable
steel frame, depending on its weight.
Keep the minimum diameter of the suction and discharge lines
(see provided drawing). Too small diameters may cause damage
to the DSS system and the dosing pump.
Depending on the viscosity and density of the dosing medium, the
number of valves and fittings, and the length of the pipes, an
increase of the diameter may be required.
The discharge line is dimensioned in such a way that pressure
peaks during the discharge stroke do not exceed the pressure
limit of the pump.
The suction line is dimensioned in such a way that the minimum
pressure during the suction stroke of the pump does not fall
below the vapour pressure of the dosing medium.
• Install the suction line with a continuous upward slope towards
the dosing pump.
– If this is not possible, use a manual vacuum pump (suction
aid).
• If the DSS system has a water flush connection, connect it to
the water supply only during flushing.
– Observe possible siphoning effects.

6.2 Electrical connection

Warning
Observe the local regulations when connecting the
DSS system to the power supply.
• Cables must comply with EN 60204-1 to meet the operating
requirements and withstand external influences.
• The electrical components must be secured against short
circuit and overload in accordance with EN 60204-1.
• DSS systems installed outdoors must be sheltered to allow
trouble-free operation.
– Exceptions are DSS systems equipped with an IP65 outdoor
cabinet with integrated heating.
• An emergency stop switch is included in the delivery. The
emergency stop switch must be installed near the DSS system
in a place where it can be reached easily. The emergency stop
switch must be connected to the control cabinet.