Xylem TEKNOSPEED - Manual (Page 21)

6. Start-up Information for installers
The start-up operations must be performed by skilled and qualified personnel. Use adequate
equipment and protections. Observe the accident prevention regulations in force.
Before starting the unit, read these operating instructions and the manual for the electric pump.
6.1 Hydraulic Connection of Electric Pump
The hydraulic connections must comply with current standards and legislation.
The product can be connected directly to the municipal water system or the water can be taken from a
storage tank.
In case of connection to the municipal water system follow the regulations locally in force (issued by City,
utility company, etc.). We suggest that you install a pressure switch on the suction side for deactivation
of the electric pump in the event of low water system pressure (protection against dry running).
Make sure that the water system pressure added to the maximum pressure of the pump does not
exceed the maximum operating pressure value (nominal pressure NP) allowed for the pump.
For example, if the system features a CA 70/33 pump we can calculate that :
Maximum head of the pump :
43 meters (equivalent to a closing contact pressure of approximately 4.3 bar)
Maximum working pressure allowed :
8 bar (NP 8)
Water system pressure (consider the maximum value):
1.5 bar
Resulting maximum working pressure :
4.3 + 1.5 = 5.8 less than the 8 bar limit
When using a storage tank it is necessary to install a float switch for deactivation of the electric pump in
the event of low water (protection against dry running).
You must install a pressure gauge on the delivery side as it may be necessary to modify the fac-
tory settings based on the actual installation conditions.
To complete the system, flexible pipes on suction and delivery side, on-off valves on suction and delivery
side, non-return valve and surge tank with diaphragm are normally installed. To avoid having to drain the
system in the event that the diaphragm tank or the pressure gauge or the pressure transmitter need re-
placing, we advise you to install on-off valves.
If you install a check valve on the pump’s delivery side, position the pressure transmitter downstream
from the valve. We advise you to install a test tap to be used during the TKS system’s calibration stage
(chapter 6.3.3) unless a water drawing point is already present in the vicinity of the pump .
For further information refer to chapter 12.
6.1.1 Surge Tank (Diaphragm Tank)
A diaphragm tank must be installed on the delivery side of the electric pump to maintain pressure in the
system when there is no water demand, in order to prevent continuous pump operation.
With the TEKNOSPEED converter there is no need for a large capacity tank. The nominal capacity of the
tank, in liters, must be at least 5% of the maximum flow rate (liters per minute) of one pump, with a mini-
mum of 8 liters of nominal capacity.
Example :
maximum flow rate of pump = 60 liters per minute
nominal volume of tank = 60 x 0.05 = 3 liters ➞ 8 liters
maximum flow rate of pump = 150 liters per minute
nominal volume of tank = 150 x 0.05 = 7.5 liters ➞ 8 liters
21
en