Temperature Differential Alarms
Alarm Configuration
•
7
-
5
The points added to the Emerson T-Stat devices are to ensure that two kinds of TD alarms are generated respectively,
and they are listed in the table below:
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 R
emote Spc Temp
is set as Yes.
1. System uses the value from a physical space temp probe as the space temp if such a
probe is installed.
2.
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
.
Table 7-4
- Alarms Generated from Emerson T-Stat
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