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Honeywell T2798I2000 Manual page 8

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Heating/Cooling + Temperature Limitation Control
Output2 can be used for temperature limitation control. To select this function, 2 temperature set
points must be pre-set. One is in the mid of proportional band of output1 (C SP / H SP) as main
setting temperature. The second one is the temperature limitation of heating or cooling (A SP).
In this mode if the measured temperature is higher (in heating mode) or lower (in cooling mode)
than temperature limitation, output2 will close and output an alarming signal. The control logic is
seen in Diagram 4 and 5.
Diagram 4: Cooling + Temperature Limit Control.
Output 2
Alarm
Valve Open
100%
50%
Valve Close
0%
Page 8 of 18
A SP
C SP
Output 1
Cooling
Temperature Increase
APHITEMPCON001-11-04

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