EUROSTER 4020TXRX
–
INSTALLATION AND OPERATION MANUAL
5
18
°C and the "HI" value to 23
°C
.
•
Hysteresis/PWM (H)
Two operational options for activating the heating algorithm are available: hysteresis or
PWM.
In the case of hysteresis, the device is activated based only on a difference between the
preset and current temperature. The parameter determines the accuracy of room
temperature control. You may set the hysteresis between 0.2
°C and 10
°C, and the
factory setting is 0.4
°C.
Setting the value to 0.0 will put the thermostat into PWM mode.
PWM is a more advanced method to achieve the preset temperature. It is suited for
systems with underfloor water heating. It is used to limit room temperature fluctuations.
Unlike in on/off controls, the current status of the transmitter depends not only on the
current difference between the preset and measured temperature but also on the past
changes of temperature. PWM operates with fixed parameters:
✓
Minimum relay activation time of 3 minutes,
✓
Number of cycles per hour - 4
✓
Operating range of the PWM algorithm of 0.7
°C.
•
Thermostat interlock (Pin)
The thermostat features a keypad lock function. A three-digit code of your choice may
be entered. In such a case it is not possible to change the settings. The interlock does
not affect the thermostat operation. To activate the interlock, change “
OFF
” to “
On
”,
in
the menu, confirm with the central button, then enter the code using the “
” buttons.
Confirm each digit with the central button. Active interlock is indicated by displaying the
icon. The interlock is active after 10 minutes. The interlock is disabled in the same
way. This function is not active by default.
•
Temperature sensor correction (C)
It is a value added to or subtracted from the measured temperature value. It adjusts
the displayed temperature within the range of +/- 5
°C. The function is convenient if
the thermostat is located in a slightly warmer or cooler area of the room.
•
Heating / Cooling (t)
Select whether the thermostat operates in heating
—
“
” symbol or cooling “
”
symbol mode.
In the cooling mode, the device connected to the thermostat will be switched on when
the temperature increases above the preset level.
•
Selection of temperature sensor (Sen)
This option permits the selection of a temperature sensor to cooperate with the thermo-
stat. There are three operation modes available:
✓
0
–
the thermostat measures and maintains the temperature based only on in-
ternal sensor operation
✓
1
–
the thermostat measures and maintains the temperature based only on ex-
ternal (cabled) sensor operation
✓
2
–
the thermostat measures the temperature of both sensors; it maintains the
temperature of an internal sensor, and the external sensor acts as a temperature
limit. Having selected this operation mode set the floor temperature limit value.
This parameter is used to establish the maximum safe floor temperature. When
the preset temperature is reached, the heating gets switched off.
•
Pairing mode (P)
Used to establish radio communication between the thermostat and receiver(s). For
pairing mode, see section 12.1.
•
Reset (rEs)
When you change the value from 0 to 1, the thermostat restores factory settings.