Conel FLOWSAN Instructions D'installation Et D'utilisation page 39

DIP switch "Off"
1 Two pumps connected
2 ESingle operation
Pump 2 is not switched on
3 Relay = alarm acknowledgeable
4 Switches from manual to
automatic mode after 5 minutes
5 - 8 Not used (without function)
Notes on DIN EN 12056-4 "Double system"
(DIN EN 752-6, 7.1 and DIN 1986-100, 7.4.3)
Systems which, due to the use of the connected drainage system (multi-family houses, offices,
commercial buildings, hospitals, warehouses, parking lots, etc.) do not allow any interruption of the
waste water discharge - even for short periods - are to be designed as double systems. Each pump in
redundant operation (1) should be able to handle the entire volume flow rate. Double systems are two
pumps installed in parallel.
In regular operation, the pumps must be switched in such a way that they work alternately in order
to achieve the most even running times possible. The requirement for a dual system is derived from
DIN EN 12056-1 - DIN EN 12056 Part 4, which covers the assurance of proper use of the drainage
system when demanded without danger and nuisance to property and residents.
In the standards DIN EN 12050-1 and -2, each in appendix A (normative) it says:
"A1 Necessity of a reserve pump / In cases where the inflow to the lifting unit is insufficient during
normal operation, the lifting installation must be equipped with a second lifting device with the same
capacity, which switches on automatically if necessary".
ATTENTION!
When the DIP switch is switched to parallel operation (2), the two pumps installed in parallel can no
longer work alternately, so that trouble-free operation is no longer guaranteed.
Please note that parallel operation is not synonymous with double the flow rate but usually only
achieves a maximum increase of 20%.
If the single pump cannot cope with the flow, various causes can be responsible. For example, the
originally calculated inflow quantity can increase due to additional drainage objects or changed
rainfall intensity (DIN 1986-100 Table A1 KOSTRA-DWD-2010). In this case, the flow rate must be
recalculated to determine whether the installed pumps meet the requirements.
"On"
One pump connected
(redundant) Parallel operation
1
Pump 2 switches on after 20 seconds in case of
high water alarm
Relay = alarm cannot be acknowledged
Switchover from automatic
Manual to automatic mode deactivated
Not used (without function)
2
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