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INTER 2V4SA
11.
Alarms
The controller sets off an alarm in the case
of a power failure, a fault in the supply circuit
or a high or low temperature.
11.1. Temperature Alarms
The diagram below explains how temperature
alarms are detected. When the average room
temperature exceeds the high temperature
alarm setting (Set Point + Hi Offset), a high
temperature alarm sets off. When the aver-
age room temperature decreases below the
low temperature alarm limit (Set Point - Lo
Offset), a low temperature alarm sets off.
The critical temperature is the absolute maxi-
mum allowable temperature in the room.
Temperature
Room T°
Alarm
Set
Point
Normal temperature range (no alarm)
Alarm : temperature out of range
Alarms
11.2. Outside Temp. Com-
In situations where the outdoor temperature
is high, the room temperature will rise as
warm air enters the building through ven-
tilation inlets. If the high set point is not
adjusted to take this into account, a high
temperature alarm may be needlessly set
off. To avoid this situation, the system can
compensate for high outdoor temperatures
when monitoring temperature alarms. When
this feature is activated and the outdoor
temperature is close to the high set point,
the room temperature is monitored with re-
spect to the outdoor temperature. An alarm
sets off only if the room temperature rises
above the outdoor temperature by a certain
value called the offset. In addition to this, the
system also uses a critical high temperature
as an absolute limit on room temperature.
When room temperature reaches the critical
high temperature, an alarm is set off. This
compensation feature is automatically en-
abled when an outside temperature probe is
connected to the controller.
Outside T° Offset: In general, the room tem-
perature is greater than the outdoor tempera-
ture by a certain number of degrees, called
the offset. The offset determines when an
alarm sets off. It is the number of degrees the
room temperature can rise above the outdoor
temperature without setting off an alarm.
Time
pensation on Temp.
Alarms
INTER 2V4SA, rev.02
31
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