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COF
COF-2BL32-170
COF-2BL32-210
COF-2BL32-220
The suction and discharge manifolds can be con-
nected either to the left or the right. The openings
that are not used are then blocked using the plugs
supplied (Fig. 4a and Fig. 4b, pos. 13). To detect
flow during operation, the flow switch must be
positioned on the ½" inlet, on the top of the dis-
charge manifold, on the side of the hose system.
Before connecting the pressure-boosting system,
fit valves to the 2 collector tanks to isolate them
when performing work on the system.
When connecting the flow switch, the following
criteria must be observed:
• Pipework must run horizontally.
• The flow switch must be oriented in the direction
of fluid flow (see arrow on sensor housing).
• The flow switch sensor must be positioned
vertically.
• Position the flow switch on the side of the hose
system
• Use the provided plug (Fig. 4a and Fig. 4b, pos. 14)
to obstruct the second inlet on the top of the dis-
charge manifold.
CAUTION!
• If the pressure-boosting system is connected to
a pressurised municipal water supply, ensure
that the system can withstand the maximum
pump pressure at zero flow rate plus the pres-
sure of the municipal water supply. If this is not
the case, a pressure reducer must be fitted to
the output of the pressure-boosting system.
• We strongly recommend installation of a differ-
ential pressure control device on the water inlet
pipe to avoid pressure fluctuations at the input
to the pressure-boosting system.
CAUTION!
• If the pressure-boosting system is supplied with
water by a suction reservoir, please contact the
Wilo engineering and design department. To
ensure the system functions in an optimum
manner, specific provisions must be followed,
such as:
• One suction tube per pump,
• The diameter of the suction tube must never be
less than that of the pump,
• The suction piping must permit underpressure,
• Limit the horizontal length of the suction piping
and avoid anything that may cause friction loss
(shrinkage, pipe elbows, etc.),
• No air intake upstream of the pressure-boosting
system,
• No water outflow close to the pump suction
tubes (if necessary, put in place an anti-vortex
strainer),
• Safety against low water level,
Installation and operating instructions Wilo-COF-2 BL
Number of
Ø
pumps
collector
tanks
2
2"1/2
2
2"1/2
2
2"1/2
• No automatic drain cock upstream of the
pumps,
• Ensure there is no friction loss generated by
accessories (strainer foot valve),
• Take care to avoid any inclined plane that could
lead to the formation of an air pocket at the high
point,
• Install a start-up tank above the pumps to com-
ply with the "NF S 62.201" standard.
NOTICE:
• The system must always be equipped with a pres-
sure tank.
8 Commissioning
We recommend that you arrange for initial com-
missioning of your pressure-boosting system to
be conducted by your closest Wilo customer ser-
vice agent or simply contact our central customer
service.
8.1 General preparations and control measures
• Prior to initial commissioning, check the wiring
installed by the customer, in particular the earth
connection;
• check the source of the water supply (sufficiently
full replenishment reservoir or appropriate munic-
ipal water supply);
• fill the system and ensure its impermeability by
conducting a visual inspection;
• open the gate valves on the pumps and in the suc-
tion and discharge pipes;
• open the stoppers in the pumps' ventilation sys-
tem and slowly fill the pumps with water so as to
allow the air to escape entirely.
CAUTION! Risk of damage to the installation!
Never let the pump run dry. Dry running
destroys the mechanical seal and causes the
motor to overload.
• Pressurise the diaphragm pressure vessel. The
vessel's inflating pressure must be 0.3 bar below
the pressure that activates the pumps (Menu 1.01
of the switchgear).
DANGER!
Do not exceed the vessel's maximum pre-infla-
tion value.
• Check the pumps' direction of rotation: on a short
start-up (Menu 3.02 and 3.03), check whether the
pumps' direction of rotation corresponds to the
arrow situated on the pump housing. If the direc-
tion of rotation is incorrect, swap two phases.
DANGER! Risk of electric shock!
Before swapping the phases, cut the power sup-
ply using the system's main on/off switch.
• On the switchgear, check and adjust the required
service parameters in accordance with the instal-
lation and operating instructions supplied.
8.2 Commissioning the system
After completing all preparatory work and per-
forming all checks detailed in Section 8.1, refer to
English
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