Unical BCM 2.0 - Page 13

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
PRESSURE
Eect: Stop burner, Pump on at
maximum speed.
RESET: AUTO
Check circulation, check
installation
19
FLOW
OVERTEMPERATURE.
It is activated when the flow
temperature is > 95. Resetting is
automatically carried out when the
temperature is < 80.
Eect: Stop burner, Pump on at
maximum speed.
Circulation control
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RETURN SENSOR
Auxiliary (SRG) sensor interrupted
Check the wiring, if needed, replace the auxiliary sensor
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MINIMUM WATER FLOW (DK)
The main water ow is not
detected by DK within 20’’ after
activating the pump.
It is enabled if the parameter
FS = 1, 2 or 3 ..
If FS.1 = 0,
Eect: Stop burner
RESET: AUTO
Check circulation, check
installation
73
WATER DEFICIENCY PRES-
SURE SWITCH
The fault is only checked if param-
eter FS 2 = 1.
It is detected if input DK is active
for more than 20” after disabling
the pump.
Eect: Stop burner
RESET: AUTO
Check circulation, check
installation
08
WATER DEFICIENCY
Insufficient water pressure and
consequent intervention of the
minimum water pressure - pres-
sure switch (DK).
Eect: Stop burner
RESET: AUTO
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HEAT EXCHANGER
FREEZING
Heat exchanger freezing is detect-
ed. If the heating sensor detects
a temperature below 2° C, burner
ignition is inhibited until the sensor
detects a temperature above 5°C.
Eect: Stop burner Pump active
for 5' at maximum speed to obtain
heat from the system.
RESET: AUTO
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FLOW SENSOR
SGM
󰀨Burner OFF.
RESET: AUTO
It is detected only if more than 1 BMM is connected
(cascade application)