TRO24T4XYZ3 Specification & Installation Instructions
7
Step Display Description Values
27
Set AI1 input signal:
Display shows “select AI1 input signal”.
Select which signal you want for AI1 input.
You can choose:
OFF (input not used),
External temperature function:
EtS (external temperature sensor 10KΩ),
Changeover function:
SENs (external change over sensor10KΩ),
NoCl (change over contact normally cool),
NoHt (change over contact normally heat),
Pressure function:
PrSd (Differential pressure sensor 0-10vdc, PrSd=10V if P=1 ),
PrSa (Velocity pressure sensor 0-10vdc, PrSa 10V=Vnom).
If changeover is selected:
When normally cool “NoCL” is selected, if contact is closed heating mode
will be activated, if contact is opened cooling mode will be activated.
When normally heat “NoHt” is selected, if contact is closed cooling mode
will be activated, if contact is opened heating mode will be activated.
When change over external sensor “SENs” is selected, heating
mode will be activated when temperature read by external
sensor is above the Change Over Set Point temperature, and
cooling mode will be activated when temperature read by
external sensor is under, see step #31.
If pressure sensor is selected:
For pressure independent VAV system, you must do calibration
by using “Air flow program mode” (page 10).
Default value: OFF
28
Set AI2 input signal:
Display shows “select AI2 input signal”.
Select which signal you want for AI2 input.
You can choose:
(Same as AI1 see step #27)
Note: AI1 input signal has priority to AI2, if you have selected the same
function AI2 will not be functional.
efault value: OFF
29
Set AI3 input signal:
Display shows “select AI3 input signal”.
Select which signal you want for AI3 input.
You can choose:
(Same as AI1 see step #27)
Note: AI1 & AI2 input signal have priority to AI3, if you have selected the
same function AI3 will not be functional.
efault value: OFF
30 C
External temperature sensor Calibration: (If ‘’EtS’’ has been selected at step
#27, 28 or 29)
Display shows “extern temper sensor offset” and the temperature read
by the external temperature sensor (if connected on the selected input).
If the sensor is not connected or short circuited, the display shows
“Eror”. You can adjust the calibration of the external sensor by
comparison with a known thermometer.
Range: 0 to 50ºC [41 to 122.0ºF]
(max. offset ± 5 ºC)
Increment: 0.1ºC [0.2ºF]
31 C
Change over set point temperature: (If ‘’SENs’’ has been selected at step #27, 28
or 29)
Display shows “Ch over setpnt temper” and the change over set point
temperature.
Please select the change over set point temperature.
Note: heating mode will be activated when temperature read by external
sensor is above the change over set point temperature, and cooling mode
will be activated when temperature read by external sensor is under.
Range: 10 to 40ºC [50 to 104ºF]
Increment: 0.5ºC [1ºF]
Default value: 24ºC [82ºF]
32
Set output signal used for pressure independent: (If ‘’PrSd’’ or ‘’PrSa’’ has
been selected at step #27, 28 or 29)
Display shows “pressur indepen output”.
Select which signal output is affected by pressure (connected to
actuator).
You can choose Floating 1 (TO1 & TO2), Floating 2 (TO3 & TO4),
Analog 1 (AO1) or Analog 2 (AO2).
Note: These selections can vary according to the choice made on steps
#4 & #12.
Default value: floating 1
