5
WILO SE 02/2016
English
4. Application
The booster is designed for boosting and main-
taining the pressure when the water supply net-
work is not well dimensioned or does not exist.
It is used for water supply in high-rise apart-
ments, hospitals, offices and industrial buildings.
Non aggressive clear fluids (potable water, water
containing glycol...).
A control box is used to control, monitor and
protect the boosting system.
The booster is either supplied from the public
water mains or from a mains collection tank.
In case of pressure deviations more than 1 bar in
the suction pipe it is recommended to use a pres-
sure relief valve. The pressure downstream of the
pressure relief valve (back-pressure) is the basis
for the total head calculation of the booster.
5. Product data
5.1 Type key
Wilo-COE-2-MHIL-304-EM/BC
Booster name
2 : number of pumps
MHIL : Type of pump (MHIL)
304 : nominal output and number
of stages (3 m
3
/h 4 stages)
EM : Single-phase
DM : Three-phase
Control box name
5.2 Technical data
- Maximum operating pressure:
10 bars
- Maximum ambient temperature: 0 à +40°C
- Maximum water temperature:
+55°C
- Three-phase supply voltage:
230/400V
(±10%) - 50Hz
220/380V
(±10%) - 60Hz
- Single-phase supply voltage:
220V (±10%)
50/60Hz
230V (±10%)
50/60Hz
- Nominal current:
see type plate
5.3 Scope of delivery
- Booster.
- Installation and operating instruction of the
booster.
5.4 Accessories
as required
- Diaphragm pressure tank (Fig. 1, pos. 11)
- Dry running kit or tank
as option
- Insulation valves
- Vibration compensators
- Pressure relief valve
- Counterflanges according to manifold diameter
6. Description and operation
6.1 General description
The booster is a compact installation that is sup-
plied completely piped-up and ready to connect.
The only connections that have to be made are
for suction and delivery pipe and also the power
mains.
Every accessory ordered is delivery separately.
The relevant instructions or standards must be
observed for the connection to the public water
supply mains. Regulations from the water com-
panies must be included when appropriate. Local
conditions (e.g. a supply pressure that is too high
or fluctuates considerably and which might
require the installation of a pressure relief valve)
must also be observed.
6.2 Product description
6.2.1 The booster (Fig. 1)
1. Control box
2. Pressure switches
3. Pressure gauge
4. Multistage horizontal pumps MHIL
5. Filling plug
6. Draining plug
7. Support and fixing frame
8. Suction manifold
9. Delivery manifold
10. Non-return valve
11. Tank (not delivered)
NOTE: each pump is fitted with insulation valves
on suction side and insulating valves and non-
return valves on delivery side.
6.2.2 Control box
• Ensure complete automatic operation of the
booster.
• Tightness, protection class IP 54.
• Thermal protection of the motors set in factory
according to nominal voltage mentioned on
motors.
• External safety and starting switch of the booster.
On front side (Fig. 2)
An electronic board:
1. LED power ON.
2. LED pump ON (one per pump).
3. LED pump fault (one per pump).
4. 3-position rotary switch (one per pump): AUTO
– O - HAND.
5. LED dry-running.
Inside (Fig. 3)
1. Main switch with power supply connection terminals.
2. Motor magnetic circuit-breaker.
3. Transmitter with connection block for external
devices (pressure switch, float switch…).
4. Contactor.
5. Motor thermal protection relay.
