Alfa Laval AquaMicro, Installation And Service Instruction

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Alfa Laval Micro
Installation and service instruction
52
A2)
Heating valve and/or actuator
does not work
RTC/STC/HTC Check the actuator and valve
function
Check the actuator by pulling out
the electrical cable and refit it
again; this will start an automatic
self-test for the actuator. Check
the flow using the energy meter
while test-running the valve.
If no energy meter is available,
disconnect the heating actuator
from the valve. Carefully depress
the valve’s spindle with a tool and
check the valve’s travel and spring
back.
Note: The valve may be very hot
Picture 46
A3)
Heating supply temperature
sensor and outdoor temperature
sensor (option) does not work 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.
B. No heating
Reason Action
B1)
Circulation pump not running 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.
B2)
Heating supply temperature
sensor and outdoor temperature
sensor (option) does not work 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.
B3)
Loss of function in the heating
control unit. Run the pump manually
If it becomes necessary to run the pump and actuator manually, this can
be done by disconnecting the power to the room thermostat.
Disconnect the electrical plug for the pump. Connect the replacement
cable (option) to the power supply and to the circulation pump. Next,
open the heating valve manually using the knob on the actuator. Open
the control valve sufficiently to satisfy the heating needs.