AFTR231PL - Underfloor heating JUNG - Free user manual and instructions

Product Type	Underfloor Heating Thermostat
Brand	JUNG
Model	AFTR231PL
Dimensions (H x W x D)	86 mm x 86 mm x 40 mm
Weight	Approx. 150 g
Power Supply	230 V AC, 50/60 Hz
Max Load	16 A (resistive), 4 A (inductive)
Display	LCD with backlight
Temperature Range	5 °C to 40 °C
Temperature Control	Proportional-Integral (PI) control
Protection Class	IP21
Mounting	Wall-mounted (flush or surface)
Compatible Floor Probes	NTC 10kΩ at 25°C
Programming	Daily/weekly schedule, 6 time periods per day
Manual Override	Yes (temporary hold)
Frost Protection	Yes (activates below 5°C)
Child Lock	Yes (keypad lock)
Maintenance	Clean with a dry cloth; do not use solvents
Security	SELV, overheat protection
Spare Parts / Repairability	Replacement probes available; contact JUNG service
General Information	Designed for electric underfloor heating systems

Frequently Asked Questions - AFTR231PL JUNG

What is the proper way to install the AFTR231PL thermostat?

Ensure the power supply is turned off. Mount the thermostat at a height of about 1.5 m from the floor, away from direct sunlight and drafts. Connect the floor probe and load according to the wiring diagram in the manual. After installation, restore power and configure the settings.

How do I program the weekly schedule on the JUNG AFTR231PL?

Press the menu button until 'Prog' appears. Use the up/down buttons to select the day, then set the time and temperature for each period (up to 6 per day). Confirm each step with OK. Save the schedule and exit.

Why is my floor heating not turning on?

Check if the thermostat has power (display lit). Verify that the set temperature is higher than the current room temperature. Ensure the schedule is active and not in 'Off' or 'Frost' mode. If still not working, test the floor probe resistance.

Can I use the AFTR231PL with a water-based underfloor heating system?

No, this thermostat is designed specifically for electric underfloor heating systems. For water-based systems, you need a different type of thermostat.

How do I reset the thermostat to factory defaults?

Press and hold the 'Menu' and 'Down' buttons simultaneously for 5 seconds. The display will show 'rES'. Confirm with 'OK' to reset all settings to factory defaults.

What type of floor sensor does the AFTR231PL require?

It requires an NTC 10kΩ sensor at 25°C. Use only the compatible JUNG floor probe or a certified equivalent.

How can I enable the child lock?

Press and hold the 'Up' and 'Down' buttons simultaneously for 3 seconds. A key icon appears on the display, indicating the keypad is locked. Repeat to unlock.

What is the maximum load the thermostat can handle?

The maximum resistive load is 16 A (about 3680 W at 230 V). For inductive loads, the max is 4 A.

How do I calibrate the temperature reading?

Enter the menu, navigate to 'CAL', and adjust the offset in steps of 0.5°C (from -5°C to +5°C). Confirm with OK.

What should I do if the display shows an error code?

Refer to the manual for error code meanings. Common codes: E1 (sensor short circuit), E2 (sensor open circuit). Check the probe connections and replace the sensor if needed. If the problem persists, contact JUNG support.

USER MANUAL AFTR231PL JUNG

Operating Instructions Floor heating controller

Two electronic control panel components: one with a dial and knob, the other showing an internal circuit board (no visible text or symbols)

1. Area of application

Used in domestic electrical installations to regulate electrical floor heating systems and temperature control systems.

2. Function

The floor heating controller consists of two parts:

• Control unit for setting the required floor temperature
- Remote sensor in the floor for monitoring the set temperature

Control unit:

Using the setting knob, set the required temperature for your floor. The numbers -6 on the knob correspond to a temperature range of 10 - 50 ^ C.

Note the setting instructions from the manufacturer of your floor heating system.

If the temperature in the floor falls below the temperature you have set, the control unit requests heat; this state is displayed by the red LED above the setting knob. You can therefore see if your heating is using energy.

A range restriction can also be carried out in the setting knob.

The operating state of your floor heating is switched on or off with the mains switch 0 - 1.

You also have the option of programming a temperature reduction via an external time switch e.g. during the night.

If you have installed this type of time switch, the temperature reduction is indicated by the green LED above the setting knob. The temperature reduction is approx. 5 °C.

Example: The temperature set by you on the control unit is 34 ^ (number on dial = 4). This means that the temperature in the floor e.g. during the night can drop down to 29 ^ without your heating switching itself on.

Sensor:

The sensor is to be installed in the floor. It monitors the floor temperature set on the control unit and issues commands to switch the floor heating on and off.

Safety instructions

Electrical equipment may only be installed and fitted by qualified electricians while observing the current accident prevention regulations.

Non-observance of the safety warnings or installation instructions may damage the device, cause fire or other hazards.

In the event of a fault, mains potential can be present at the sensor.

① The switch 0 – I on the control unit causes a singlepole disconnection of the device from the mains and interrupts the circuit to the heating resistor in the floor.
① When working on the load circuit, the mains voltage must be disconnected in principle.
① When the sensor is interrupted, the relay contact is closed. If the sensor experiences a short circuit, the relay contact is open.

3. Connection and installation

Control unit

Mount the control unit in a switch box in accordance with DIN 49 073.

Notice! The device must always be mounted with its supporting frame on top of the wallpaper!

- Carry out the electrical connection according to the wiring diagram (Fig. (1)). Solid conductor cross-section: 1 to 2.5 mm2 No PE conductor required. PE conductor is only used for looping through. Protection class II can be achieved through appropriate installation measures.

Abb.1

Temperature Management Floor heating controller

Ref.-no.: ..FTR 231 ..

Symbols used in the wiring diagram

L : L conductor

N : N conductor

TA : Connection for clock signal for temperature reduction

← : Load connection

NTC : Connection for remote sensor

• Mount the control unit with the screws supplied.
• Place the center plate together with the frame on the flush insert. The center plate must snap in place in the top left of the housing base.
• Tighten the screw (A in Fig. (2)).
• Clip on the setting knob (B).

Abb.2

4. Sensor

The sensor must be laid in a conduit. It is thereby protected against damp and can easily be replaced in the event of a repair.

Dimension drawing of remote sensor: Fig. (3).

5. Restricting the temperature setting range

The controller is set ex works to the maximum setting range of *to 6. There are 2 adjustment rings (Fig. (4)) in the setting knob which have a setting range of 5 to 30 °C. When restricting the range, we ask you to carry out the setting according to the diagram (Fig. (5)):

Temperature Management Floor heating controller

Ref.-no.: ..FTR 231 ..

b.4

Abb.5

x = restricting the range in the setting knob y = setting range of the controller z = sensor temperature °C

6. Technical data

The controller corresponds to DIN EN 60 730 type 1 and has radio interference suppression in accordance with VDE 0875 or EN 55 014.

6.1. Control unit

Operating voltage AC 230 V\~ 50/60 Hz

Temperature setting range

(dial)

^* ...6 (= 10 ... 50 °C)

Switching current

Switching capacity 2.3 kW

Red LED Control unit requires heat (heating mode)

Green LED Temperature reduction "on"

Contact (relay) 1 make contact (for heating), (non-floating)

Temperature reduction (TA) approx. 5 K

Differential in switching

temperature approx. 1 K

Protection type of housing

acc. to EN 60529 IP 30

Operating temperature 0...+40 °C

Storage temperature -25...+70 ^

6.2. Remote sensor

Sensor element NTC

Sensor cable PVC, 2 x 0.75 mm², 4 m

Protection type acc. to

EN 60529 IP 67

Operating temperature -20...+70^

Storage temperature -20+70^

Subject to change without further notice.

The sensor cable can be extended up to 50 m if required using a 2-core cable with a cross-section of 1.5 mm ^2 , without influencing the accuracy of the controller.

When laying in cable trunking or in the vicinity of power cables, a shielded cable should be used.

6.3. Sensor characteristic values

Measuring device Ri > 1 MΩ

Ratio temperature to resistance: see table in Fig (6).

The resistance values can only be measured with a disconnected sensor.

Temperature °C Resistor kΩ

05	85,279
10	66,785
15	52,330
20	41,272
25	33,000
30	26,281
35	21,137
40	17,085
45	13,846
50	11,277

The resistance values can only be measured with a disconnected sensor.

7. Guarantee

Our products are under guarantee within the scope of the statutory provisions.

Please return the unit postage paid to our central service department giving a brief description of the fault:

ALBRECHT JUNG GMBH & CO. KG

Service-Center

Kupferstr. 17-19

D-44532 Lünen

Service-Line: 0 23 55 . 80 65 51

Telefax: 0 23 55 . 80 61 89

CE The c€ sign is a free-trade mark intended solely for state authorities and does not contain any assurance of properties.