Cumberland Expert-32P, User Manual

Page: 60 / 76

60
Expert-32P rev.11
Expert-32P
Temperature Alarms:
The following diagram explains how temperature alarms are detected:
When the average room temperature exceeds the high temperature
alarm setting, a high temperature alarm is generated. When the average
room temperature drops below the low temperature alarm setting, a low
temperature alarm is generated. Although these settings are entered by
the user as absolute values, they are defined relative to the current set
point and are automatically adjusted by the controller when the set point
changes. This means, for example, that when the controller switches to
the nighttime set point, the high and low temperature alarms are read-
justed using the same offset from the daytime set point.
The situation is slightly different when the outside temperature is greater
than the set point. In this case, the set point is replaced by the outside
temperature as the reference point. This means an alarm is set off when
the indoor temperature reaches Outside Tempe High Alarm
Offset (the offset being the difference between the high alarm tempera-
ture setting and the set point). A third parameter, called the critical
temperature, is defined to continue monitoring the indoor temperature
for high temperatures. When the indoor temperature reaches the critical
high temperature (defined as an absolute value), an alarm is set off.
Room
Tempera-
ture
Set Point
High T°
Time
High Temperature Alarm
Low T°