1. Functional Principle
The programmable FIT thermostat allows setting switching times (up to 9 per day) and temperatures according to personal habits. After installation, the controller automatically displays the current time and floor temperature. In Automatic mode (AUTO), heating is regulated based on the switching times and temperatures set in Program 1. Temperature regulation is dependent on the floor temperature measured by the remote sensor. Heating activates when the temperature drops below the set value.
2. Installation
Caution: The device must only be opened and installed by a qualified electrician according to the wiring diagram in the housing cover or this manual. Existing safety regulations must be observed. To meet the requirements of Protection Class II, appropriate installation measures must be taken. This independently mountable electronic device is intended for temperature regulation exclusively in dry, closed rooms with normal ambient conditions. The device complies with EN 60730 and operates according to mode of operation 1C.
3. Usage
The electronic floor temperature controller FIT 3F can be used for regulating floor temperature in conjunction with:
- Direct electric floor heating
- Floor heating systems
4. Features
- Single-line text display for simplified operation
- Backlighting
- Real-time clock (Year, Month, Day, Time setting)
- Automatic Summer/Winter time switching
- Max. 9 switching times per day (variable per day)
- Pre-set and customizable time programs
- Optimum Start (temperature reached at the set time)
- Programmable with the control unit detached
- Shutdown function: Press the [V] button for 10 seconds
- Holiday function with date specification (Holiday from... to...)
- Short-term timer (Party) for hourly temperature changes
- Energy consumption display (On-time * Cost) for the last 2 days, week, month, year
- Energy cost per hour adjustable
- Frost protection
- Adjustable temperature range limit
- Tamper protection
- Selectable operator languages
- Controller method: PWM or 2-point (On/Off)
- Minimum on/off time and output hysteresis adjustable for On/Off control
- Floor temperature readable as a numerical value
5. Mounting
The controller should be mounted in a location easily accessible for operation. Installation is typically in a 60 mm flush-mounted box ("55er" standard). Steps involve detaching the control unit and trim frame, then mounting in reverse order. Caution: Mount only in non-conductive (plastic) flush-mounted boxes.
Electrical Connection: Connect according to the wiring diagram. Suitable for solid and flexible conductors, cross-section 1 to 2.5 mm². Caution: Ensure the line is de-energized before connecting.
Remote Sensor Connection: A remote sensor is necessary for the FIT 3F. It should be mounted to accurately capture the temperature to be regulated, preferably in a protective tube for easier replacement. The sensor cable can be extended up to approx. 50 m using a 2-core cable for 230 V. Avoid close parallel runs with mains cables, e.g., in cable conduits. Caution: Sensor lines carry mains voltage.
Wire Stripping: Maximum wire stripping length is 8 mm. When inserting or removing flexible wires, press the actuator. Wires must be mounted so the plastic strip acts as insulation to the mounting screw.
6. Technical Data
| Specification | Value |
|---|---|
| Order Designation | FIT 3F |
| Voltage Supply | 230 V AC 50 HZ (195…253 V) |
| Temperature Setting Range | 10 °C to 40 °C; in 0.5 °C steps |
| Temperature Display | 0.1 °C steps |
| Output | Relay normally open, potential-bound |
| Switching Current | 10mA ... 16(4)A *; 230 V~ |
| Output Signal | Pulse Width Modulation (PWM) or 2-point (On/Off) |
| PWM Cycle Time | Adjustable |
| Hysteresis | Adjustable (for 2-point) |
| Minimum Switching Time | 10 minutes |
| Power Consumption | ~ 1.2 W |
| Timekeeping Accuracy | < 4 Min / Year |
| Time Reserve | ~ 10 Years |
| Remote Sensor | F 193 720, Length 4m, extendable up to 50m |
| Ambient Temperature (Operation) | 0°C to 40°C (non-condensing) |
| Storage Temperature | -20°C to 70°C (non-condensing) |
| Rated Impulse Voltage | 4 kV |
| Ball Pressure Test Temperature | 115 °C |
| Voltage and Current for EMC Emission Tests | 230 V, 0.1 A |
| Protection Type | IP 30 |
| Protection Class | II (see Caution) |
| Software Class | A |
| Degree of Pollution | 2 |
| Weight (with remote sensor) | ~ 280 g |
* For current > 14 A, do not loop the N-line through the controller; connect separately.
7. Wiring Diagram / Dimensions
Wiring Diagram Description: The diagram shows the controller connected to a 230V~ 50Hz power supply (L, N) and the Load/Output. The remote sensor (Sensor) is connected to dedicated terminals. The diagram emphasizes the connection of the remote sensor F 193 720.
Dimensions Description: A diagram shows dimensions, including a circular cutout of Ø 7.8 mm, likely for a wire or conduit entry.
Display Indicators: The controller display shows:
- Current Day
- Current Floor Temperature
- Heating is on (blinks if the lower part is not available, detached, or without voltage)
- Help Text
- Operating Mode: AUTO
- Current Time: e.g., 14:31
8. Pre-set Programs
The controller features 3 pre-set time and temperature programs. Program 1 is the default. If this program meets your needs, no changes are necessary. To select another program, refer to section 9. G1 (Select Program).
Program 1
Monday to Friday:
| Switch Time | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Time | 6:00 | 8:00 | 19:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 28.0 | 15.0 |
Saturday and Sunday:
| Switch Time | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Time | 8:00 | 10:00 | 19:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 28.0 | 15.0 |
Program 2
Monday to Friday:
| Switch Time | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Time | 6:00 | 8:00 | 12:00 | 14:00 | 19:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 28.0 | 18.0 | 28.0 | 15.0 |
Saturday and Sunday:
| Switch Time | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Time | 8:00 | 10:00 | 12:00 | 14:00 | 19:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 28.0 | 18.0 | 28.0 | 15.0 |
Program 3
Monday to Friday:
| Switch Time | 1 | 2 | 3 |
|---|---|---|---|
| Time | 11:00 | 13:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 15.0 |
Saturday and Sunday:
| Switch Time | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Time | 8:00 | 10:00 | 19:00 | 22:00 |
| Temperature °C | 28.0 | 18.0 | 28.0 | 15.0 |
Programming Notes:
- Settings automatically exit after 3 minutes of inactivity without saving, returning to the previous operating mode (AUTO, MAN, HOLIDAY, TIMER, HOME).
- Code input: Use [+/-] to set value, then [OK].
- User and installer settings refer to manual chapter numbers (e.g., G1 for "Select Program", H2 for "Control Type").
- Gaps may occur in numbering.
9. Function Description and Operation
Language Selection: If the language is not pre-set, the user must select it. Prompt appears on first start or after reset. Select desired language using [+/-] and confirm with [OK] twice. AUTO mode will then be displayed.
How to Use the FIT Temperature Controller:
- Temporarily change temperature (until next switching time): See Buttons, [+/-] in AUTO.
- Regulate temperature according to pre-set profiles: See Main Menu, AUTO.
- Set constant temperature (Manual mode = MAN): See Main Menu, MAN.
- Set temperature for a number of hours: See Main Menu TIMER.
- Set temperature for a specific date: See Main Menu HOLIDAY.
- Set a special program for specific days: See Main Menu HOME.
- Adapt the controller to user habits: See Main Menu USER SETTINGS.
- Adapt the controller to the heating system: See Main Menu INSTALLER SETTINGS.
Buttons:
- [+/-] in AUTO: Change temperature until the next switching time. Display shows '-' after AUTO. First press shows set temp, subsequent presses change it.
- [+/-] in Menus: Navigate through menus.
- [OK]: Confirm setting/selection.
- [Info]: Displays additional info in AUTO, MAN, TIMER, HOLIDAY, HOME. Press again to exit.
- [Menu]: Enter menu, use [+/-] to navigate.
- [←]: Go back one step.
- [V] for 10 sec: Turn off connected heating. Display shows OFF. See G4 for details.
Main Menu: Use [+/-] to select menu items, [OK] to confirm/activate.
- B AUTO: Temperature regulated automatically per program settings (see G1). Temperature can be adjusted with [+/-] until the next switching time.
- C MAN: Temperature is permanently regulated to the set value. Adjust with [+/-].
- D TIMER: Temperature regulated for a set number of hours to a set temperature. Previous mode resumes upon exit. HOLIDAY mode ends TIMER.
- E HOLIDAY: Temperature regulated for a set number of days to a set temperature. Holiday starts at 0:00 on the first day and ends at 24:00 on the last day. AUTO is active until the holiday begins. If the start date is in the future, other modes can be selected. HOLIDAY starts automatically when the start time occurs. Previous mode resumes upon exit.
- F HOME: Temperature regulated according to the set program (independent of AUTO). Program is the same for all days. Default matches Monday's program. Exit by user selection (e.g., AUTO). Use for holidays, home, illness, etc.
- G USER SETTINGS: Adapt controller to personal requirements.
- H INSTALLER SETTINGS: Adapt controller to heating system (installer only).
G USER SETTINGS:
- Select Program: Choose from pre-set programs (see 8.). Changes are not saved on program switch. (Default: P1)
- Set Switching Times: Adjust time and temperature for the selected day (of the active program). Switching times can be reduced or extended up to 23:50 (indicated by '>>>' for next day). Max 9 switching times. Times can be set for day blocks (Mon-Fri, Sat/Sun, Mon-Sun). Press [V] multiple times to exit programming.
- Set Clock: Set date and time.
- Heating Off: Turns off the controller output (display OFF). Frost protection remains active if enabled (H6). Re-enable by activating a mode (AUTO, MAN, etc.) or pressing [V] for 10 sec. AUTO is activated upon re-enabling via [V] or this menu.
- Summer/Winter Switching: Select automatic Summer/Winter time switching. (Default: YES)
- Access Protection: Protects against unauthorized use. Reactivate with code = 93. (Default: NO)
- Temperature Limits (Upper/Lower): Limits adjustable temperature. If both values are equal, no change is possible. Affects AUTO, MAN, HOLIDAY, TIMER, HOME, and switching time settings. (Default: 10; 40 °C)
- Cost/h for Energy: Enter estimated energy cost per hour (Cent/h) for the regulated area. Set to 100 for hourly counter function. (Range: 1...999)
- Energy Consumption: Shows approximate energy consumption for the last 2 days, week, month, year. Calculation: Heating on-time x Cost per hour. Reset via H9. (Displays 9999 on overflow).
- Display Setpoint Temperature: Display setpoint temperature instead of floor temperature. (Default: NO)
- Number for Floor Temperature: Display floor temperature as a numerical value. (Default: NO)
- Light: Permanently on, off, or briefly on after button press. (Options:KURZ, AUS, DAUERND)
- Language: Select operating language.
- Info: Display controller type and version.
- Reset User Settings Only: Resets only USER SETTINGS to factory defaults. Energy counter is not cleared. (Default: NO)
H INSTALLER SETTINGS:
Caution: These settings should only be performed by an installer as they can affect the safety and function of the heating system.
- Code: Enter code (= 7) for these settings. Valid for one hour.
- Heating Type: Controller can be used for specified heating systems. (Default: FLOOR, see 1)
- Control Type: PWM or On/Off can be selected. For PWM, cycle time (minutes) is adjustable (min 10% cycle time). Short for fast, long for slow systems. For On/Off: Hysteresis (OFF = no hysteresis, output switches after delay) and Minimum On/Off Time (relay stays on/off for at least this time) are adjustable. (Default: PWM/10, Range: /10...30 for PWM; OFF, 0.1...5.0 for Hysteresis; 1...30 Min for Min Time)
- Frost Protection: Set frost protection temperature. Regulated only when controller is off (see G4). (Default: 10 °C, Range: OFF, 10...40)
- Optimum Start: Temperature is reached at the programmed time. AUTO_ is displayed during pre-heating. (Default: NO)
- Reset Energy Counter: Resets the counter to 0. (Default: NO)
- Reset All: Resets all INSTALLER and USER settings to factory defaults. (Default: NO)
10. Error Displays
When an error occurs, "Err" blinks. Possible errors:
- CONFIGURATION: Upper and lower parts do not match. Solution: Use only matching components; switch power off and on again.
- COMMUNICATION: Communication between upper and lower parts is disturbed. Solution: Detach and reattach upper part; switch power off and on again.
- EXT SENSOR: 1. Sensor break/short circuit of the remote sensor. Solution: Replace the remote sensor. 2. Exceeding or falling below the display range.
In case of any error, heating operates at 30% of the time.
11. Batteries
According to EU Directive 2006/66/EG, the button cell battery mounted on the circuit board may only be removed by qualified personnel at the end of the product's life.
12. Resistance Table for Remote Sensor
This table shows the resistance of the remote sensor at different temperatures:
| Temperature | Resistance | Temperature | Resistance |
|---|---|---|---|
| 10 °C | 66.8 kΩ | 30 °C | 26.3 kΩ |
| 20 °C | 41.3 kΩ | 40 °C | 17.0 kΩ |
| 25 °C | 33 kΩ | 50 °C | 11.3 kΩ |
