Wilo Comfort CO R-MVI Serie Manual Del Usuario página 80

Fault
Pump(s) do not switch off
Switching frequency is too high
or fluttering
Installation and operating instructions Wilo-Comfort CO(R) .. MVI ... /.. MVIS ... /.. Helix V ... /.. Helix VE ...
Cause
Major fluctuations in the inlet pressure
Inlet pipe is blocked or shut off
Nominal diameter of the inlet pipe is too
small
Inlet pipe is installed incorrectly
Air in the inlet
Impellers are blocked
Non-return valve is leaking
Non-return valve is blocked
Gate valve in the system is closed or not
sufficiently open
Flow rate is too high
Shut-off device is closed at pressure
sensor
Switch-off pressure is set too high
Incorrect direction of rotation of the
motors
Major fluctuations in the inlet pressure
Inlet pipe is blocked or shut off
Nominal diameter of the inlet pipe is too
small
Inlet pipe is installed incorrectly
Shut-off device is closed at pressure
sensor
No diaphragm pressure vessel present
(optional or accessory)
Supply pressure at existing diaphragm
pressure vessel incorrect
Valve on existing diaphragm pressure
vessel closed
Existing diaphragm pressure vessel
defective
Switching difference is set too low
Remedy
Check the inlet pressure and take measures to
stabilise the inlet pressure if necessary (e.g.
pressure reducers).
Check the inlet pipe and remove the clogging or
open the shut-off device if necessary
Check the inlet pipe and increase the cross-sec-
tion of the inlet pipe if necessary
Check the inlet pipe and change the pipe routing
if necessary
Check and shut off the piping and vent the
pumps if necessary
Check the pump and replace it or have it
repaired if necessary
Check and replace the seal or non-return valve if
necessary
Check and remove the clogging or replace the
non-return valve if necessary
Check and open the shut-off device completely
if necessary
Check the pump data and default values and
correct them if necessary
Check and open the shut-off device if necessary
Check the setting and correct if necessary
Check the direction of rotation and correct by
swapping over the phases if necessary
Check the inlet pressure and take measures to
stabilise the inlet pressure if necessary (e.g.
pressure reducers).
Check the inlet pipe and remove the clogging or
open the shut-off device if necessary
Check the inlet pipe and increase the cross-sec-
tion of the inlet pipe if necessary
Check the inlet pipe and change the pipe routing
if necessary
Check and open the shut-off device if necessary
Retrofit a diaphragm pressure vessel
Check the supply pressure and correct it if nec-
essary
Check the valve and open it if necessary
Check the diaphragm pressure vessel and
replace if necessary
Check the setting and correct if necessary
English
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