©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 6 - 5
The four points added to the AHU application are to ensure that two kinds of alarms are generated respectively, and they are
listed in the table below:
For the CC T-Stats device, three properties need to be added in the Alarms tab, and they are listed in the table below:
The points added to the T-Stat devices are to ensure that two kinds of TD alarms are generated respectively, and they are listed
in the table below:
Table 6-2- Alarms Generated from AHU Application
Alarms Type
(Same alarm short
description)
Conditions Alarms Generate
Alarms by Heat Alarm Diff
The supply temperature value is not higher than the user-specified sensor’s value by at least the Heat
Alarm Diff amount.
If the supply temp value is higher than the user-specified sensor’s value by the Heat Alarm Diff amount or
more, the previously generated alarm returns to normal.
Alarms by Cool Alarm Diff
The supply temperature value is not lower than the user-specified sensor’s value by at least the Cool
Alarm Diff amount.
If the supply temp value is lower than the user-specified sensor’s value by the Cool Alarm Diff amount or
more, the previously generated alarm returns to normal.
Table 6-3- Alarm Properties in T-Stats
Name
Property Details
Visibility
Value Range Default Log
Diff Alarm
Notice; Critical;
Non-critical; Disable
Disable N/A
When this property is set as Disable, below two
properties will not be visible.
Heat Alarm Diff 0~54.00DDF 18.00DDF N/A Refer to the interpretation above.
Cool Alarm Diff 0~54.00DDF 18.00DDF N/A Refer to the interpretation above.
Table 6-4- Alarms Generated from T-Stat
Alarms Type
(Same alarm short
description)
Conditions Alarms Generate
Alarms by Heat Alarm
Diff
When the system goes to heating control, an alarm is generated when the Supply Air Temp value is not
higher than the Space Temp value by at least the Heat Alarm Diff amount.
If the Supply Air Temp value is higher than the space temp value by the Heat Alarm Diff amount or more, then
the previously generated alarm returns to normal.
About the Space Temp Value:
1. System uses the Rem Space Temp value as the space temp value if Remote Spc Temp is set as Yes.
2. System uses the value from a physical space temp probe as the space temp if such a probe is installed.
3. Remote Spc Temp is set as No
Alarms by Cool Alarm
Diff
When the system goes to cooling control, an alarm is generated when the Supply Air Temp value is not lower
than the Space Temp value by at least the Cool Alarm Diff amount.
If the Supply Air Temp value is lower than the Space Temp value by the Cool Alarm Diff amount or more, then
the previously generated alarm returns to normal.
The rules that system chooses the Space Temp value is the same as those for alarms by Heat Alarms Diff.
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