Wilo COHe, Installation And Operating Instructions Manual

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p. 19 4227862 ed.04
6.3 Function of the booster
The boosters are fitted with non self-priming, multistage high pressure centrifugal pumps as standard. The
pumps increase the pressure and deliver water to the consumer via the delivery manifold pipe. In this purpose
they are switched on and off depending on the pressure. The pressure sensor continuously measures the
actual pressure value, converts it into a current signal and transmits it to the control box. Depending on
demand and type of control system, the control box starts, exchanges or stops the pumps until the preset
control parameters are reached (a more precise description of the type of control system and the control
process is mentioned in the installation and operating instruction of the control box).
7 Installation and hydraulic connection
7.1 Installation
Install the booster in a room that provides an easy access, well ventilated, frost-proof and protected against
rain.
Be sure that the dimension of the technical room door is adequate to enter a booster.
Enough space must be provided for maintenance work. The installation should be freely accessible from at
least two sides.
The installation surface must be level and horizontal.
7.2 Hydraulic connection
ATTENTION !
Observe the requirements from the water supply companies and the local rules into force.
- The connection of the suction and delivery manifolds 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 or blind flanges.
- Valves must be fitted on the manifolds to isolate the booster if need be.
- The installation must be fitted with a diaphragm pressure tank.
(See the respective technical and operating instruction)
- The existing pipes must be installed free from stresses.
Compensators with length limiters for flexible connecting pipes are recommended for this purpose in order to
avoid stresses on the pipe connections and minimize the transmission of installation vibrations to the building
installation.
Connection to public water supply
Be sure the installation can withstand the maximum pump pressure at zero flow plus the public water mains
pressure. Otherwise connect the pressure relief valve to the booster outlet.
Connection on load to a tank
Be sure the installation can withstand the maximum pump pressure at zero flow plus the tank pressure.
Otherwise connect the pressure relief valve to the booster outlet behind the tank.
7.3 Electrical connection
WARNING! Electrical shock hazard
Electrical connections and checks must be performed by an authorized electrician and
according to the standards into force.
To make the electrical connection, the corresponding installation and operating instructions and attached
electrical circuit diagrams must be observed. General points to be considered are listed below: