Filling And Venting The System - Wilo Multivert MVIS Notice De Montage Et De Mise En Service

- The adjustable minimum speed must not fall
below 40 % of the pump's rated speed
(the minimum motor speed 1000 rpm).
- The maximum speed must not exceed the value
stated on the pump's rating plate.
- The controllers with frequency converters sup-
plied by Wilo already have an integrated filter.
8. Commissioning
8.1

Filling and venting the system

CAUTION! Danger of damage to the pump!
The pump must not be allowed to run dry.
The system must be checked prior to switching
on the pump.
8.1.1 Venting – inlet mode (Fig. 3)
- Close the two stop valves (2 + 3).
- Loosen the venting screw (5).
- Slowly open the stop valve (2) on the suction
side.
- Close the drain cock as soon as the air has been
emitted and fluid runs out of the pump (5).
WARNING! Risk of burns!
If the fluid is hot and the pressure is high, there
is the danger of scalding or other injuries being
caused by the stream ejected from the drain
cock.
- Fully open the stop valve (2) on the suction side.
- Open the stop valve (3) on the pressure side.
8.2 Commissioning
CAUTION! Danger of material damage!
The pump must not be allowed to run at zero
volume flow (stop valve closed on the pressure
side).
The following flow rate must be ensured:
Pump type Min. volume
flow
MVIS 2 0.4 m³/h
MVIS 4 0.5 m³/h
MVIS 8 1 m³/h
WARNING! Danger of injury!
Depending on the pump's or system's operat-
ing conditions (fluid temperature, volume flow),
the entire pump, including the motor, can get
exceedingly hot. Risk of burns if the pump is
touched!
Installation and operating instructions – Wilo-Multivert MVIS
9.
Max. volume
flow
5 m³/h
8 m³/h
15 m³/h
CAUTION! Check the direction of rotation!
Incorrect direction of rotation causes poor pump
output and the possible overloading of the
motor.
- In the terminal box there is a control lamp
(Fig. 1, pos. 9), which illuminates if the direction
of rotation is correct.
- If the control lamp does not illuminate, there is
no supply of operating voltage or the direction
of rotation is incorrect. In the last case, swap
the two phases of the mains connection.
Maintenance
All maintenance and repair work must be car-
ried out by authorised and qualified personnel!
WARNING! Danger due to electrical voltage!
Dangers from electricity must be ruled out.
The pump must be voltage-free before com-
mencing electrical work and secured against
unintended reactivation.
WARNING! Risk of burns!
If the water temperature and the system pres-
sure are high, close the stop valve on the suction
side and on the pressure side. The pump must
cool down first.
- No special maintenance is necessary during
operation.
- During periods of frost, stationary pumps must
be cleaned to prevent damage: To do this, close
the stop valves (Fig. 3, pos. 2 and 3) and fully
open the drainage screw (Fig. 1, pos. 6) as well as
the venting screw (Fig. 1, pos. 5).
English
19