Comfortheat ETN Programmable Thermostat User Manual

Comfortheat ETN Programmable Thermostat

INTRODUCTION

ETN4-1999 is an all-in-one thermostat for DIN-rail mounting in an approved cabinet. It covers 1he 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 of -19.5 to+ 70 °C. The large backlit display provides a clear view of the status, while the three navigation buttons allow easy menu operation.

GENERAL OPERATION

Thermostat
The ON/OFF button is used to turn the thermostat off “O” or on “I”. When the ON/OFF switch is in position “O”, the relay is deactivated. All settings are saved. 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 the button is last pressed.

DAILY USE
Temperature setting
The thermostat has a temperature setting range of -19.5 to + 70 °C. The menu allows limits to be defined in “SCA c:> Hi/Lo”, “Li c:> Hi/ Lo”.

• 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.

Child lock
Allows thermostats in public and other places to be locked, thus preventing unauthorized 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 right­hand buttons simultaneously for 10 seconds.

THERMOSTAT SETUP MENU Menu overview

Parameter	Shown on display				Factory settings
Max. temperature	SCA	a	Hi	a 70	70 °C (0,0/+70 °C)
Min. temperature	SCA	a	Lo	a -19,5	-19,5 °C (-19,5/+60 °C)
Max. limit tempera- ture FLOOR *1	Li	a	Hi	a 28	28 °C (-19.5/+70 °C + OFF)
Min. limit tempera- ture FLOOR *1	Li	a	Lo	a 15	15 °C (-19.5/+70 °C + OFF)
Min. limit tempera- ture Limit function *2	Li	a	Lo	a -19,5	-19,5 °C (-19.5/+70 °C + OFF)
Frost protection	dEF	a	8.0		8 °C (0/+10 °C)
Night setback *3	nSb	a	-5.0		-5 °C (-19.5/+30 °C)
Measured floor temperature	FLo	a	24.5 (example) *4
Measured room temperature	ro	a	21.5 (example) *4
Application	APp	a a a a	F    (Floor sensor) A (Room sensor) Li (Limit function) AF (Room sensor with floor tempe- rature limits) C : Regulator		F : Floor
		a
Scale	LCd	a	C		C = Celsius (nU = numerical 0-100 %)
Temperature reading in start display	dF	a	SP		SP = Setpoint (tP = actual temp.)
Adjust offset	Adj	a	24.5 (example)		Actual temperature (+/- 10 °C)
Control method	PWM	a	On		On (OFF)
PWM cycle time *5	cyc	a	20		20 minutes (10-60 min)
Differential tempera- ture *6	dIF	a	0,4		0.4 °C (0.3/10 °C)
Relay function	rEL	a	no		no = normally open (nc = normally closed)
EN50559	PLi	a	0		0 min (0-20 min.)
Software version	SU	a	x.xx
*1 : Only available if APp a AF is selected under Application. *2 : Only available if APp a Li is selected under Application. *3 : Only available with external timer. *4 : With no or disconnected sensor, – – is shown on the display. *5 : Only available if PWM is ON under Control Method. *6 : Only available if PWM is OFF under Control Method.
If Regulator (C) is selected under Application, the floor and room sensors are discon- nected and heating is controlled on a scale of 0-10, corresponding to 0-100 % of full power.

Settings

To set parameter values, press and hold the centremost button for three seconds. SCA a Hi a 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.

Max. temperature
The highest temperature to which the thermostat can be set. Min. temperature The lowest temperature to which the thermostat can be set.

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 sensors with floor limit (AF).

Limit function
If an application (app) is set to limit (Li), the lowest temperature at which heating is to be provided can be set.

Frost protection
The lowest temperature for frost protection is when the function is activated via an external signal (See instructions).
Example: The setpoint is 25 °C.
Frost protection = 8 °C means temp. setting = 8 °C.

Night setback / energy-saving function
The number of degrees in the temperature setting is to be reduced. The night setback setting must be preceded by a minus sign (-). Is controlled via an external signal (See instructions).
Example: The setpoint is 25 °C.
Energy-saving function = -5 °C means temp. setting = 20 °C. Energy-saving function = +3 °C means temp. setting = 28 °C.

Measured floor temperature
Displays actual floor temperature (if a floor sensor is fitted). Measured room temperature Displays the actual room temperature.

Application
Sets thermostat function. Select the required control type.

Thermostat with sensor for:	APpa F Floor	APpa A Room	APpa Li Limit	APpa AF Room/ floor limit	APpa C Regulator
Floor	x		x		x
Room		x			x
Room and Floor	x	x	x*	x	x
Without					x

Note: * Room sensor not in use.

Floor (F): The thermostat controls floor temperature alone. A floor sensor must be fitted.
Room (A): The thermostat controls room temperature alone.
Limit (Li): Limit is an on/off function in which the required limit is set in Limit low (”Li” a ”Lo”) after selecting the Li option under APp. When the recorded temperature is above the tem-perature specified in ”Li” a ”Lo”, temperature is controlled in the usual way towards the user-specified setpoint. If, on the other hand, the temperature drops below that specified in ”Li” a ”Lo”, the relay cuts out, and ”Lo” appears on the display. Limit function (APp a Li) should be selected if a limit is required for when heating is permitted to be activated. Only one sensor is used for the limit function, and this sensor must be connected to the floor sensor input of the thermostat.
Room/limit (AF): The thermostat controls room temperature while respecting min. and max. limits for floor temperature. A floor sensor must be fitted.
Regulator (C):
The thermostat functions as a simple regulator and no sensors are used. The setting is in percent. ”Regulator” mode in combination with ”Night setback” If both Regulator mode (APp a C) and ”Night setback” are selected, night setback is set in relative values while frost protection is set in absolute values in percent. The setpoint specifies (in percent) the time the unit is to remain active in a PWM cycle, which is usually 20 min, while the setback degree is specified as a percentage of the setpoint. The setpoint multiplied by the setback degree gives the activation degree. Example: If the setpoint is set to 60 % and the night setback is set to 25 %, the activation degree will be (0.60 x 0.25 = 0.15) = 15 %. Graphic example:

The diagram should be read as follows: Furthest to the left is the 100 % duration of PWM, while the vertical lines indicate successive 20 % drops in the time heating is provided relative to 100 %. The black area indicates the percentage cut-out time determined by the setpoint. Together with the light grey area, the dark grey area indicates the relative amount of operating time when nSb has not been activated, but the dark grey area cuts out when nSb is activated. The light grey area is the relative amount of operating time when nSb has been activated by the above-mentioned values. The default value of setback degree ”night setback” (nSb) is 30 %. nSb is inactive as default. Frost protection ”dEF” has the specified activation degree and is unaffected by the setback degree in nSb.

Scale
Choose between degrees Celsius and a numerical scale. If the numerical scale is selected, the temperature is set on a scale from 0.0 to 10.0 where 0.0 corresponds to min. temperature (SCA aLo) and 10.0 corresponds to the max. temperature (SCA a Hi). Temperature reading Defines which temperature is to be shown on the start display: the setpoint (SP) or the actual, measured temperature.

Adjust 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 that 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 a normally open position (NO). If the thermostat is used for cooling purposes, the relay should be turned to normally close (NC).

EN50559
This thermostat complies with EN 50559 (VDE 0705-559) for electrical floor heating. The regulation applies to electrical floor heating, with a maximum floor weight of 4 kN/m². To ensure that hotspots due to unintentionally covering up the surface are avoided, the heating function can be time-limited as per EN/DIN. Note that this function is not applicable to other heating applications such as wall and/or ceiling heating. If it can be foreseen in advance that unintentional covering up of a floor might occur, then it is important to assess the correct period of time for which the floor heating must be time-limited.
The heating can be limited using a set number between 0 – 20 minutes per hour.
Example:
If obstacles could be present that cover up the floor, then the heating might need to be limited by some number of minutes so as to avoid hotspots on the floor. If you want the thermostat to heat a maximum of 90 % of the time, then the thermostat should be limited by 10 %.

Ten percent of one hour is 6 minutes
Enter 6 min. in the EN50559 menu in order to lower the heating by 10 %. An equation to calculate the number of minutes that could be entered in the EN50559 menu – when an average heating effect is desired:

Note! If the result of the equation is negative, then nothing should be entered.

Software version
Displays thermostat software version.

TROUBLESHOOTING

Factory reset
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 aF) followed by the temperature setting.

Error messages
If a fault occurs, the thermostat will display one of the following error codes:

Error code	Fault	Remedy
EO	Interna l fau lt. Ther- mostat defective.	Rep lace the rmosta t.
E1	External room sensor defective or short-circu ited (terminals 10-11).	Replace sensor/sensor cable. To continue to operate the system without sensor, set control type to Regulator under Application (APp QC).
E2	External floor sensor defect ive or short- circuited (t ermina ls 8-9).	Replace sensor/sensor cable. To continue to operate the system without sensor, set control type to Regula tor under Application (APp QC).
E5	Internal overheating. The thermostat shuts off the heating.	Check installations. Check that heating cables are not overloaded or that the ambient temperature is excessive. When internal temperature drops, the thermostat automatically reactivates.

COMFORT HEAT LTD
Laisves av. 123 I LT – 06118 I Vilnius
Ph. +370 5 2704596 I Fax. +370 5 2704498 info@comfortheat.eu
www.comfortheat.eu

REFERENCE:

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