48
The data inside this manual are not binding and they can be modified by the manufacturer without notice.
All rights reserved.
NPC 280 - 400
b1AC
Circuit 1 chiller mode
antifreeze alarm
Operating and in stand-by
OFF remote
If the antifreeze regulation
probe
Pbr
measures a temp.<
than the set
AL26
(**) for at
least
AL28
(**) seconds
With the digital input
configured as antifreeze
alarm and active.
Antifreeze regulation
probe
Pbr
measures a
temp. > than the set
A26(*
*)+ differential
AL27(**
)
With digital input
disabled
Auto. – becomes
manual after
AL29(**
) tripping
per hour (reset
procedure in
functions menu)
E
Flashing
If
AL30
(**)=0
only the comp.
are turned off the
alarm label
(
b1Ac b2Ac
) is
signalled but the
alarm relay and
buzzer are not
activated
If
AL30
(**)=1
the comp. are
turned off,
The alarm label
(
b1AC b2AC
)
are signalled and
the alarm relay
and buzzer are
activated.
In addition to the
above mentioned
actions, if the
alarm comes
from the ID, the
antifreeze
heaters are also
activated
b2AC
Circuit 2 chiller mode
antifreeze alarm
b1Ac
Circuit 1 chiller mode
antifreeze alarm signal
b2Ac
Circuit 2 chiller mode
antifreeze alarm signal
ATTENTION
Both labels are displayed with the evaporator input alarm or the evaporator common output active or with a single ID configured.
b1AH
Circuit 1 heat pump
mode antifreeze alarm
Operating and in stand-by
OFF remote
If the antifreeze regulation
probe
Pbr
measures a temp.<
than the set
AL33
(**) for at
least
AL36
(**) seconds
With the ID configured as
antifreeze alarm and active.
Antifreeze regulation
probe
Pbr
measures a
temp. > than the set
A33
(**)+ differential
AL34
(**)
With ID inactive
Auto. – becomes
manual after
AL37
(**) tripping per
hour (reset procedure
in functions menu)
E
Flashing
If
AL38
=0 (**)
only the comp.
are turned off the
alarm label
(
b1Ah-b2Ah
) is
signalled but the
alarm relay and
buzzer are not
activated
If
AL38
=1 (**)
the comp. are
turned off,
The alarm label
(
b1AH-b2AH
)
are signalled and
the alarm relay
and buzzer are
activated.
In addition to the
above mentioned
actions, if the
alarm comes
from the ID, the
antifreeze
heaters are also
activated
b2AH
Circuit 2 heat pump
mode antifreeze alarm
b1Ah
Circuit 1 heat pump
mode antifreeze alarm
signal
b2Ah
Circuit 2 heat pump
mode antifreeze alarm
signal
Both labels are displayed with the evaporator input alarm or the evaporator common output active or with a single ID configured.
ATTENTION
Parameter
AL35
(**) delays the antifreeze alarm (air/air unit low air temperature output) at the start of the unit in the heat pump mode.
If in the stand-by / OFF remote mode, the unit indicates an antifreeze alarm and the time set in parameter
AL35
(**) is different than 0, by
selecting the heat pump mode with the button or with ID, the antifreeze situation is reset and the compressor can be turned on for the time set in
parameter
AL35
(**) because the unit starts to heat the water or air. Once the delay time
AL35
(**) has passed, if the antifreeze regulation
probe
Pbr
still measures a temperature < than the set
AL33
(**) for at least
AL36
(**) seconds, the unit is blocked and an antifreeze alarm is
signalled.
Code
Meaning
Cause
Reset
Restart
Icon
Action
