Carel thTx Mode D'emploi page 20

ENG
Switching the terminal off and on (ON/OFF)
Switching the terminal off and on can be managed not only by the
terminal itself, but also by Modbus.
To switch it on, press ; press
The terminal is switched off and on via Modbus register HR143 (0 = OFF,
1 = ON).
Enabling the buzzer
To manage the buzzer, access menu parameter E4 (enable buzzer) and
confirm:
• 0 = Disabled;
• 1 = Enabled;
Lock keypad
When the terminal is in normal operation, press Up
3 seconds to lock the display, with the padlock icon shown. The same can
be done via Modbus, setting variable HR165.
Output controll
The mode is available for heating and cooling mode, and is managed by
the user.
• cooling set point ( icon on LCD)
• heating set point ( icon on LCD)
The dF (differential) parameter in the parameters menu defines the
differential in heating and cooling mode. The set point must be defined by
the user. The request can also be managed in humidity. The management
of the actuators is the responsibility of the control that drives the thTx.
HEATING
Output Output
R
Temp.
dF
set point set point
Set point
Switch on the thermostat, use the up arrow to increase the set point, or
use the down arrow key to decrease it, 0.5 degrees at a time.
The temperature can also be set via Modbus variable HR144.
Notice: the maximum and minimum set point value can be limited
variables HR145 and HR146 and menu parameters E6 and E7.
The same thing applies when the relay is configured for managing
Humidity mode, in which case the set point has increments/decrements
of 1% RH; the set point value can also be set via Modbus variable HR 134.
Notice: the maximum and minimum set point value can also be
limited via Modbus variables HR152 and HR153 and menu parameters
E22 and E23.
Differential
To set the Temperature differential, access menu parameter E19, while for
Humidity access menu parameter E21. The increment for the temperature
differential (HR58) is 0.1, from 0.0 to 5.0. The increment for the Humidity
differential (HR50) is 1, from 0 to 20.
Humidity control
In models fitted with a humidity probe, the data is displayed next to
the temperature value. The relative humidity value can also be read via
Modbus register HR134.
"thTx" +030220865 rel. 1.0 - 11.03.2024
again to switch off.
& Down
COOLING
HUMIDIFICATION
R
R
Temp.
dF
dFH
Fig. 2.b
Alarm
When one of the following alarms is present, the error code is displayed
on the LCD. Modbus coil 32 takes the value 1.
• if the error is on the temperature sensor, the LCD displays "E1",
• if the error is on the humidity sensor, the LCD displays "E3".
Temperature sensor calibration
To adjust the temperature calibration, access menu parameter E8
(temperature
calibration); the range is between -9 and + 9 °C, with
± 0.1 °C steps. The same configuration can be done via Modbus, setting
variable HR10
Humidity sensor calibration
To adjust the humidity calibration, access menu parameter E9 (humidity
calibration); the range is -20 to +20 RH% with ± 0.1% RH steps. The same
can be done via Modbus, setting variable HR57.
for
Manual mode
The display can also be operated via Modbus, overwriting the values and
therefore completely managing the icons and related outputs.
To enable this mode, simply set the desired parameters via Modbus:
• Coil 59 is used set the MODE [0=Automatic, thTx; 1= manual, via Mod-
bus]
• Coil 60 is used to configure the Fan [0=Automatic, thTx; 1= manual, via
Modbus]
Management of the icons on the display
In the default configuration, the thTx can operate in Heating / Cooling
/ Ventilation mode; setting menu parameter E12 or Modbus register
HR350, certain icons can be displayed, specifically:
0: The fan operates and is visible in both heating and cooling
Output
modes
Mode
%HR
1: The fan operates in cooling mode but is not visible in heating
mode
Mode
2: The fan operates in heating mode but is not visible in cooling
mode
Mode
10
Icon shown Ventilation ramp
YES YES
YES YES
YES YES
Icon shown Ventilation ramp
YES NO
YES YES
YES YES
Icon shown Ventilation ramp
YES YES
YES NO
YES YES