Alfa Laval Micro Instructions D'installation, D'entretien Et D'utilisation page 58

Alfa Laval Micro
Installation, service and operating instruction
Symptom Reason
No heating
Circulation pump not running
Heating supply temperature sensor
and outdoor temperature sensor
(option) does not work
Loss of function in the heating
control unit.
Disturbing noise Pump capacity set too high
from the circulation
pump/ Noise in the
radiator system
Air in the pump
Pump motor or pump component
damaged
Differential pressure control valve
set too high
Heating Heating supply temperature sensor
temperature and outdoor temperature sensor
unstable (option) does not work
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56
Action
Check that the electrical power is on
Check the circulation pump
If the pump fails to start after stopping, try to start
it at the highest setting.
Check the heating parameters in room
thermostat
Summer reduction (Economy function) parameter
2, category 2: If measured outdoor temperature is
higher than target temperature, the pump should
not be operating.
Pump difference (Economy function) parameter 3,
category 2:
If the calculated water supply temperature is not
greater than the outside temperature by this
amount the heating will switch off.
If parameter 3 is set to 0, the pump operation will
not be affected by this parameter.
Check the heating supply temperature sensor
and outdoor temperature sensor (option)
Check that they are correctly cited and working.
To confirm that sensors are connected and
operating, press the info button on the room
thermostat, check that the specified temperatures
are reasonable.
See 19.5.5 Run the pump manually
Reduce the pump capacity
The pump has been set at a too high capacity
level. Reduce the level by choosing a lower output
setting on the pump.
The lowest setting is the most economical.
Vent the pump
The pump is self-venting.
Air in the pump may cause noise. This noise
ceases after a few minutes run time.
Quick venting of the pump can be obtained by
setting the pump to speed III for a short period,
depending on system size and design. When the
pump has been vented, i.e. when the noise has
ceased, set the pump according to the
recommendations.
See 19.5.6 Change pump components or the
complete pump
See 15 Differential pressure control valve, DPC
Check the heating supply temperature sensor
and outdoor temperature sensor (option)
Check that they are correctly cited and working.
To confirm that sensors are connected and
operating, press the info button on the room
thermostat, check that the specified temperatures
are reasonable