EVCO S.p.A.
EV3 MVC & EVD MVC
| Application manual ver. 2.2c | Code 1443DMVCI224
page 62 of 74
Code
Label on display
Description
AL16
Artc
Clock alarm
The alarm signal is activated when the clock shows an invalid date or is damaged and time band
regulation is activated (t01).
Automatic alarm.
Main results:
- regulating using the clock is not permitted
AL17
AL18
AFLS
AFLr
Supply or return flow alarm
The alarm signal is activated when the input configured as a flow switch (for either supply or
return) is active for a time period equal to A07, with a delay of A06 from the switch-on of the
associated fan; it is deactivated when the input is inactive for a time period equal to A08.
It reverts to manual reset if the number of alarm events in an hour exceeds A09.
Main results:
- when the alarm is in automatic mode the electric coils and the compressor are switched off
- when the alarm is in manual mode all the loads are switched off
AL19
ACnf
Changeover probe not configured alarm
The alarm is activated if the changeover probe has not been configured correctly.
Automatic alarm.
Main results:
- inhibits the automatic changeover operations
AL20
AL22
AV1
AV2
Water temperature congruence alarm
The alarm signal is activated in heating (cooling) mode if the water probe temperature is lower
(higher) than the temperature setpoint value, after a period equal to A13 seconds from when the
water valve is opened and for a period of A13 seconds from when the condition occurs. It is
deactivated when the temperature remains above the se C37/2 (setpoint - C38/2) for a
period of A13 x 10.
It reverts to manual reset if the number of alarm events in an hour exceeds A05.
Main results:
- the associated water coil is switched off
AL21
ASF
Filter pressure switch alarm
The alarm is activated if the input configured as filter pressure switch is active. It is deactivated if
the input is inactive.
Automatic alarm.
Main results:
- signal only
AL23
ACnG
Digital input congruence alarm
The alarm is activated if the
Heat pump status
digital input is configured and the following
settings are not applied:
Heat pump status (NO)
= 1 and the machine is in heating mode
Heat pump status (NC)
= 0 and the machine is in heating mode
Heat pump status (NO)
= 0 and the machine is in cooling mode
Heat pump status (NC)
= 1 and the machine is in cooling mode
Automatic alarm.
Main results:
- the water valve is switched off
AL24
AFir
Fire alarm
The alarm is activated if the input configured as
Fire Alarm
is active. It is deactivated if the input
is not active.
Manual alarm.
Main results:
- If C68 = 0 (fire management) all the loads are switched off
- If C68 = 1 (smoke management) the coils are switched off, and the fans and the dampers are
set to maximum.