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Honeywell T2798I2000 Manual page 5

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Heat / Cool Changeover of Output1
Output1 is suitable for Heat/Cool changeover (manually) control in 2pipe AHU, Zoning control or
Hydronic Heating application. Wiring connection is shown in fig.
With cooling or heating selected, the user set point (SP) will be positioned at the middle of
proportional band. The output percentage is proportional to the temperature measured and
decided by proportional band. The proportional band can be set from 2.0° C to 19.0° C. The
control logic is seen in Diagram 1.
Diagram 1:
Heating
Valve Open
100%
50%
Valve Close
0%
Wiring Diagram
D/I
1 2
3
4
5
4 - 20 mA
2 - 10 VDC
L
24VAC
110VAC /
N
230VAC
0VAC
E
2-10VDC /
4-20mA
POWER
Actuator
SUPPLY
Unit
Page 5 of 18
Proportional band
Pt1000
sensor
A/O
6
7
8
PT1000
REMOTE SENSOR
Note: If Emergency IP [D/I] not used then
sp
Add link between terminal No 5 & 3.
Cooling
Temperature Increase
APHITEMPCON001-11-04

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