Technical data

TFHB24F3XYZ2
Specification & Installation Instructions
4
Step Display Description Values
9
Set signal for 2 pipe system:
Display shows
“select 2 pipe signal”. Cooling and heating symbols are
also displayed.
Select which signal output you want for your 2 pipe system.
You can choose analog, on/off or floating output.
If you select analog, AO1 will be set in automatic heat/cool change over.
If you select on/off, TO1 will be set in automatic heat/cool change over.
If you select floating, TO1 will be set close and TO2 open.
If you have selected analog signal, go directly to step #11.
If you have selected on/off signal, go directly to step #13.
Default value: Analog
10
Set floating time:
Display shows
“set floating time in seconds” and the floating time value
(in seconds).
Please select desired value of the floating time signal.
Go to step #13.
Range: 15 to 250 sec.
Increment: 5 sec.
Default value: 100 sec.
11
Minimum voltage of the analog output:
Display shows
“min vdc analog output” and the value of the minimum
voltage of the analog ramp.
Please select the desired value of the minimum voltage of the analog
ramp. (This is the “zero” value)
The minimum value is restricted by the maximum value. (step #11)
Range: 0.0 to 10.0 Volt
Increment: 0.1 Volt
Default value: 0.0 Volt
12
Maximum voltage of the analog output:
Display shows
“max vdc analog output” and the value of the minimum
voltage of the analog ramp.
Please select the desired value of the maximum voltage of the analog
ramp. (This is the “span” value)
The maximum value is restricted by the minimum value. (step #10)
Range: 0.0 to 10.0 Volt
Increment: 0.1 Volt
Default value: 10.0 Volt
13
Change over sensor selection:
Display shows
“Ch over temper sensor”.
Please select which sensor is rewired to the analog input: SENs (external
change over sensor), NoCl (change over contact normally cool) or NoHt
(change over contact normally heat).
When normally cool “NoC
L” 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 #14.
If “SENs” is not selected, go directly to step #21.
Default value: SENs
14
C
Change over set point temperature: (If ‘’SENs’’ has been selected at step #13)
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.
Go to step #21.
Range: 10 to 40ºC [50 to 104ºF]
Increment: 0.5ºC [1ºF]
Default value: 24ºC [82ºF]
15
Set signal for 4 pipe heating system: (If ‘’4P’’ has been selected at step #8)
Display shows
“select 4 pipe heating signal”. Heating symbols is also
displayed.
Select which heating signal output you want for your 4 pipe system.
You can choose analog, on/off or pulse output.
If you select analog, AO2 will be set in heating.
If you select on/off or pulse, TO2 will be set in heating.
If you have selected on/off or pulse signal, go directly to step #18.
Default value:
A
nalog
16
Minimum voltage of the heating output:
Display shows
“min vdc analog output heating” and the value of the
minimum voltage of the heating ramp.
Please select the desired value of the minimum voltage of the heating
ramp. (This is the “zero” value)
The minimum value is restricted by the maximum value. (step #17)
Range: 0.0 to 10.0 Volt
Increment: 0.1 Volt
Default value: 0.0 Volt