ETN4-1999 is an all-in-one thermostat for DIN-rail mounting in an approved cabinet. It covers the needs of a variety of applications in which maximum comfort and minimum energy consumption are required, e.g. electric floor heating, frost protection, ice and snow melting, cooling, etc. The thermostat allows a required temperature to be set within the range -19.5 to +70°C. The large backlit display provides a clear view of status, while the three navigation buttons allow easy menu operation.
ETN4-1999 THERMOSTAT
Thermostat operation
The ON/OFF button is used to turn the thermostat off “0” or on “I”. When the ON/OFF switch is in position “0”, the relay is deactivated. All settings are saved. The thermostat is easily operated using the navigation buttons. Basic functions like temperature and thermostat settings are simple to perform. Whenever a button is pressed, the backlighting will come on and stay lit for 30 seconds after a button is last pressed.
Temperature setting
The thermostat has a temperature setting range of -19.5 to +70°C. The menu allows limits to be defined for the range within temperature may be set (factory setting = 0-40°C). The required temperature is set using the left- or right-hand button. The temperature setting flashes on the display. Five seconds after the setting has been made, the required temperature will be shown on the display continuously.
Settings
To set parameter values, press and hold the centremost button for three seconds. SCA 40 will appear on the display. Firstly, SCA will be displayed for 1 second, followed by Hi, and finally 40. The required value can now be set using the navigation buttons. To access the next parameter, press the programming button again. If no button is pressed for 30 seconds, the program returns to the initial display.
| Parameter | Shown on display | Factory settings |
| Max. temperature | SCA ð Hi ð 40 | 40°C (-19.5/+70°C) |
| Min. temperature | SCA ð Lo ð 0 | 0°C (-19.5/+70°C) |
| Max. limit temperature FLOOR *1 | Li ð Hi ð 28 | 28°C (-19.5/+70°C + OFF) |
| Min. limit temperature FLOOR *1 | Li ð Lo ð 15 | 15°C (-19.5/+70°C + OFF) |
| Frost protection | dEF ð 8.0 | 8°C (0/+10°C) |
| Night setback | nSb ð -5.0 | -5°C (-19.5/+30°C) |
| Measured floor tem- perature | FLo ð 24.5 (example) *4 | |
| Measured room temperature | ro ð 21.5 (example) *4 | |
| Application | APp ð F (Floor sensor) ð A (Room sensor) ð AF (Room sensor with floor temperature limits) ð C : Regulator | F : Floor |
| Scale | LCd ð C | C = Celsius (nU = numerical) |
| Temperature reading in start display | dF ð SP | SP = Setpoint (tP = actual temp.) |
| Offset | OFF ð 0 | 0 (+/- 10°C) |
| Control method | PWM ð On | On (OFF) |
| PWM cycle time *2 | cyc ð 20 | 20 minutes (10-60 min) |
| Differential tempera- ture *3 | dIF ð 0.3 | 0.3°C (0.3/10°C) |
| Relay function | rEL ð no | no = normally open (nc = normally closed) |
| Software version | SU ð 1.0 | |
| *1 : Only available if APp ð AF is selected under Application. *2 : Only available if PWM is ON under Control Method. *3 : Only available if PWM is OFF under Control Method. *4 : With no or disconnected sensor, – – is shown on the display. | ||
| If Regulator (C) is selected under Application, the floor and room sensors are disconnected and heating is controlled on a scale of 0-10, corresponding to 0-100% of full power. | ||
Max. temperature
Max. limit temperature
Allows the highest permissible floor temperature to be set for wooden and other floor types when the control type has been set to room sensor with floor limit (AF).
Min. limit temperature
Allows the lowest permissible floor temperature to be set for tiled and other floor types when the control type has been set to room sensor with floor limit (AF).
Frost protection
The lowest temperature for frost protection when the function is activated via an external signal (fig. 4 in instructions).
Night setback / energy-saving function
The number of degrees the temperature setting is to be reduced. The night setback setting must be preceded by a minus sign (-). Is controlled via an external signal (fig. 3 in instructions).
Application
Sets thermostat function. Select the required control type. Four alternatives exist:
Scale
Choose between degrees Celsius and a numerical scale. If the numerical scale is selected, temperature is set on a scale from 0.0 to 10.0 where 0.0 corresponds to min. temperature (SCA Lo) and 10.0 corresponds to max. temperature (SCA Hi).
Temperature reading
Defines which temperature is to be shown on the start display: the setpoint (SP) or the actual, measured temperature.
Offset
If the actual temperature (measured using a thermometer) differs from that displayed by the thermostat, the thermostat can be adjusted to offset the difference.
Control method
PWM or ON/OFF control can be selected. PWM is an advanced control method which calculates the most effective and economical way to heat homes and other buildings. ON/OFF control is traditional differential control (e.g. 0.3°C) for other tasks.
PWM cycle time
Allows cycle time to be set when using PWM control. At least 20 min is recommended.
Differential temperature
Allows temperature differential to be set when using ON/OFF control. The higher the differential temperature, the lower the number of relay operations.
Relay function
When used for heating purposes, the relay should be in normally open position (NO). If the thermostat is used for cooling purposes, the relay should be turned to normally closed (NC).
Software version
Displays thermostat software version.
Child lock
Allows thermostats in public and other places to be locked, thus preventing unauthorised alteration of the settings. Press and hold the left- and right-hand buttons simultaneously for 10 seconds. A symbol indicates that the thermostat is locked. The child lock can be released by pressing the left- and right-hand buttons simultaneously for 10 seconds.
Factory settings
Allows factory settings to be restored. Your personal settings will be deleted from the thermostat. Press and hold the centremost button for 10 seconds. The display is switched off and then on again. Application is shown on the display (APp F) followed by the temperature setting
If a fault occurs, the master/thermostat will display one of the following error codes:
| Error code | Fault | Remedy |
| E0 | Internal fault. Thermostat defective. | Replace thermostat. |
| E1 | External room sensor defective or short-circuited (terminals 10-11). | Replace the sensor/sensor cable. To continue to operate the system without a sensor, set control type to Regulator under Application (APp ðC). |
| E2 | External floor sensor defective or short-circuited (terminals 8-9). | Replace the sensor/sensor cable. To continue to operate the system without sensor, set control type to Regulator under Application (APp ðC). |
| E5 | Internal overheating. Thermostat shuts off heating. | Check installations. Check that heating cables are not overloaded or that ambient temperature is excessive. When internal temperature drops, the thermostat automatically reactivates. |
The ETN4-1999 All-in-one is an electronic on/ off thermostat for 1 or 2 NTC sensors located externally. An All-in-one thermostat for many application types:
PRODUCT PROGRAMME
WARNING – Important Safety Instructions.
Disconnect the power supply before carrying out any installation or maintenance work on this control unit and associated components. This control unit and associated components should only be installed by a competent person (i.e. a qualified electrician). Electrical installation must be in accordance with appropriate statutory regulations.
NOTE: Use philips PH2 or slotted 4×0.8 mm screwdriver. Screws must be tightened with a torque of 1,0 Nm.
MOUNTING OF SENSORS
The 2 sensors contain a safety extra-low voltage (SELV) circuit, allowing the sensors to be placed as close to the floor surface as necessary without the risk of electric shock, should the sensor cable become damaged. The two wires from the sensor to the thermostat must be separated from high-voltage wires/cables. The sensor cable may be extended up to 100 m by means of a separate two-core cable. The two-core cable must be placed in a separate pipe or segregated from power cables. Two vacant wires in a multi-core cable used for example to supply current to the floor heating cable must not be used. The switching peaks of such current supply lines may create interference signals that prevent optimum controller function. If a shielded cable is used, the shield must not be connected to the earth (PE).
Floor sensor
It is recommended that the cable and sensor be placed in a non-conductive installation pipe embedded in the floor (fig. 2). The end of the pipe must be sealed and the pipe placed as high as possible in the concrete layer. Alternatively, the sensor can be embedded directly in the floor. The sensor cable must be led through a separate pipe or segregated from power cables. The floor sensor must be centered between the heating cable.
Room sensor
The room sensor is used for comfort temperature regulation in rooms. The sensor should be mounted on the wall approx. 1.6 m above the floor in such a way as to allow free air circulation around it. Draughts and direct sunlight or other heat sources must be avoided (fig. 5).
NIGHT SETBACK / FROST PROTECTION
The ETN4-1999 has 2 inputs for night setback and frost protection. See Fig. 3+4. Do not use night setback and frost protection at the same time.
POWER UP
To turn on the ETN4-1999 thermostat, push the power slide button up to On “I”. The backlit display will briefly show the application and then the set temperature.
PROGRAMMING
See ETN4-1999 user manual.
FAULT LOCATION
If the sensor is disconnected or short-circuited, the heating system is switched off. The sensor can be checked against the resistance table (fig. 6).
ERROR CODES
CE MARKING
According to the following standard:
CLASSIFICATION
The product is a Class II device (enhanced insulation) and must be connected in the following way:
ENVIRONMENT AND RECYCLING
Please help us to protect the environment by disposing of the packaging in accordance with national regulations for waste processing.
RECYCLING OF OBSOLETE APPLIANCES
Appliances with this label must not be disposed of with general household waste. They must be collected separately and disposed of in compliance with local regulations.
COMFORT HEAT
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Comfortheat ETN4 Programmable Thermostat User Manual
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Comfortheat ETN4 ELECTRIC Programmable Thermostat Setup Manual
Comfortheat ETN4 HYDRONIC Programmable Thermostat Operating Manual
Comfortheat ETN4 THERMOSTAT Wiring Diagram
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