Alfa Laval Micro Instructions D'installation, D'entretien Et D'utilisation page 57

Symptom Reason
Heating system
Filter for heating media clogged
temperature too
high or too low
Differential pressure control valve
incorrectly adjusted (option
No heating Closed radiator or floor heating
valves
Filter for heating media clogged
Differential pressure control valve
incorrectly adjusted(option)
Heating Alternating pressure on primary
temperature side
unstable
Filter for heating media clogged
Differential pressure control valve
incorrectly adjusted (option)
19.2 STC service instructions
Hand manoeuvre of the heating actuator
The room thermostat must be without current when manoeuvring the actuator by hand.
NOTE: if manually adjusting the actuator, the operator control panel must be restarted before use.
Symptom Reason
Heating system The heating control equipment may
temperature too need to be adjusted
high or too low
Heating valve and/or actuator does
not work
Heating supply temperature sensor
and outdoor temperature sensor
(option) does not work
All manuals and user guides at all-guides.com
55
Installation, service and operating instruction
Action
See 19.5.2 Check if the filter for heating media is
blocked.
See 15 Differential pressure control valve,
Check that all radiator valves and floor heating
valves are fully open
See 19.5.2 Check if the filter for heating media is
blocked.
See 15 Differential pressure control valve, DPC
Check available differential pressure and
temperature at the primary heating medium
provider
See 19.5.2 Check if the filter for heating media is
blocked.
See 15 Differential pressure control valve, DPC
Action
Check and adjust the heating curve
See 12.2 CM737-Installer parameters table
change the selected heating curve with parameter
15 category 1.
If needed the set heating curve can be fine-tuned.
Increase/ decrease the room temperature to
parallel adjust the heating curve.
Also see section 9.1 OTC heating curve
Parallel adjustment of heating
See 19.5.4 Check the actuator and valve function
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.
Alfa Laval Micro
DPC.
and
and 9.2
curve.