6
WILO SE 02/2016
English
6. Transformer board with protections for control
circuit.
Supply board (Fig. 4)
1. Primary transformer fuses.
2. Secondary transformer fuses.
3. Voltage selector switch.
Transmitter (Fig. 5, 6, 7)
Fig. 5. Connection board for external devices.
Fig. 6. Transmitter.
Fig. 7. Bypass transmitter.
Pressure switches for automatic operation
(Fig. 8)
Both pressure switches allow automatic ON/OFF
switching of both pumps. They are standard.
1. Setting nut for pump stop pressure – high pres-
sure (PF).
2. Deviation setting nut.
6.2.3 Diameter of the manifolds
COE 2-MHIL series 3/5 m3/h: threaded manifolds
2"
6.2.4 Lack of water protection
The booster needs to be fitted with a dry-run-
ning protection device:
• Connection to public water supply: pressure
switch to be assembled on the suction manifold
and connected to the control box.
• Connection to a tank: float switch to be installed
on the tank and connected to the control box.
6.3 Product function
6.3.1 Operating
The control box ensures the automatic operation
of the booster.
When the pressure drops and reaches the setting
value defined for the pressure switch P1, pump 1
starts. If the pressure drops further and reaches
the setting value of the pressure switch P2,
pump 2 starts.
Then the pressure increases and reaches the set-
ting value of the pressure switch 2, pump 2
stops. When pressure reaches the setting value
of the pressure switch P1, pump 1 stops.
In case of failure from the transmitter it can be
replaced by the module bypass de permutation.
There is no more pump change, pressure switch
1 monitors pump 1 whereas the pressure switch
2 monitors pump 2.
Pump change
To get the same using and operating time for all
the pumps, a pump cycling for the starting order
is defined after each stop of the main pump.
Operating mode
A 3-position rotary switch on the front part (Fig.
2, pos. 4) allows to select 3 operating modes per
pump:
- Position O: The pump is OFF.
- Position HAND: The pump is operating in contin-
uous mode as long as the switch is maintained in
this position. When releasing it, the switch is
back to position O.
- Position AUTO: All control functions of the
booster are operative.
Magnetic fault
A magnetic circuit breaker (Fig. 3, pos. 2) pro-
tects the motors against shortcircuit.
Heat fault
A thermal relay is used as protection against
motor overload (Fig. 3, pos. 5).
6.3.2 Input (Fig. 5)
1 and 2. Lack of water: a pressure switch (contact
NO) or a float switch protects the booster
against lack of water, an input ON/OFF is dedi-
cated to this sensor.
5 seconds are needed to start again the booster
after closing the contact (water back).
6.3.3 Signalling (Fig. 2)
Information per booster
1. Power ON: mains voltage signalling
(fixed yellow LED).
5. Lack of water: lack of water signalling
(fixed red LED).
Information per pump
2. Pump ON: pump operating indication
(fixed green LED).
3. Pump alarm: pump fault indication (red LED)
when thermal relay is switched on (motor over-
load).
7. Installation
7.1 Local
Install the booster in a room that provides an
easy access, well ventilated and frost-proof.
Be sure that the dimension of the technical room
door is adequate to enter a booster.
Adequate space must be provided for mainte-
nance work. An easy access to the installation
shall be ensured from at least two sides.
7.2 Assembling
Assembling on well smooth and horizontal floor
with fixing per foundation bolts. Plan insulating
material (cork or reinforced rubber) under the
concrete pad to avoid any emission of water cir-
culating noise.
7.3 Hydraulic connection
ATTENTION!
Observe the requirements from the
water supply companies and the local rule into
force.
- The connection of the suction and delivery man-
ifolds can be made either on the right or left
hand sides of the installation. It is recommended
to close the ports that are not used with thread
caps.
- Valves must be fitted on the manifolds to easily
separate the booster if need be.
- The installation must be fitted with at least one
diaphragm pressure tank to be assembled on the
