GSI Group 890-00584, Installation And Configuration Manual

Page: 52 / 120

Chapter 8: Configuring a Temperature Zone
Setting the Outdoor Temperature Compensation
During hot and cold weather periods, it is difficult to maintain a cool or warm indoor temperature. The out-
door temperature compensation lets the system take into account the outside temperature before setting
off unnecessary alerts.
1. In edit mode, under the Limits tab, click on the box next to External temperature compensation .
The LED lights when the oudoor temperature compensation is enabled.
2. Click on the Ext. offset edit field to display the keypad. Enter the desired value.
3. Click on the Critical field to display the input keypad. Enter the desired value.
How it Works: Outdoor Temperature Compensation
The outdoor temperature compensation uses the outdoor temperature as a guide to raise the high alert
threshold to avoid too many unnecessary alerts during hot weather periods. A maximum critical tempera-
ture is set as a protective measure.
During hot weather periods, it might be difficult or impossible to maintain cool indoor temperatures. The
outdoor temperature compensation feature allows you to raise the indoor temperature high alert threshold
to avoid an unnecessary high number of alerts.
In general, the indoor temperature is greater than the outdoor temperature by a certain number of degrees,
this is the
Ext. offset setting. The Ext. offset is added to the outdoor temperature reading to produce the
high temperature limit. An alert is set off only when the indoor temperature rises above the high tempera-
ture limit. The
Ext. offset value can be modified.
In addition, there is a critical temperature setting ( Critical ) that limits the high alert threshold to a maximum
temperature. An alert is always set off when the zone temperature goes above the critical temperature,
whatever the outdoor temperature.
Table 8-1 Controls for the outdoor temperature compensation feature
Description Default Value
The outdoor temperature reading is given by an outdoor probe. Reading
The outdoor offset is added to the outdoor temperature reading to produce the high
temperature limit. 5 °F (2.8 °C)
The high temperature limit is calculated by adding the Ext. offset value to the outdoor
temperature reading. Above this temperature, an alert is set off.
Calculated value
The critical temperature setting is the maximum allowable indoor temperature. An
alert is always set off above this temperature setting. 95 °C (35 °C)
The check box allows to activates and deactivates the outdoor temperature compen-
sation feature. A checked box indicates
the outdoor compensa-
tion feature is activated
The two figures below are very similar. Both show the implementation of the outdoor temperature compen-
sation feature, one with the high-low temperature feature and the other with the temperature maturation
curve feature.
An indoor temperature reading curve is added to show when alerts are set off. The low alert threshold
(thickest bottom line) is not influenced by the outdoor temperature compensation feature settings.
52 895-00677 Agri Alert 128 Touch