Frost Protection - OJ Electronics ETN4-1999 Bedienungsanleitung

ETN4-1999
Parameter Shown on display
Max. temperature SCA  Hi  40
Min. temperature SCA  Lo 
Max. limit tempera-
Li  Hi  28
ture FLOOR *1
Min. limit tempera-
Li  Lo  15
ture FLOOR *1
Min. limit tempera-
Li  Lo  -19,5
ture Limit function *2

Frost protection

dEF  8.0
Night setback
*3 nSb  -5.0
Measured floor
FLo  24.5 (example)
temperature
Measured room
ro  21.5 (example)
temperature
APp  F (Floor sensor)
Application
 A (Room sensor)
 Li (Limit function)
 AF (Room sensor
with floor tempe-
rature limits)
 C : Regulator
Scale LCd  C
Temperature reading
dF  SP
in start display
Offset
OFF  0
Control method
PWM  On
PWM cycle time
*5 cyc  20
Differential tempe-
dIF  0.3
rature *6
Relay function
rEL  no
Software version
SU  1.01
: Only available if APp  AF is selected under Application.
*1
*2 : Only available if APp  Li is selected under Application.
: Only available with external timer.
*3
: With no or disconnected sensor, - - is shown on the display.
*4
*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.
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 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 control type has been set to room sen-
sor with floor limit (AF).
Limit function
If 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 when the function is
activated via an external signal (fig. 4 in instructions).
2
Factory settings
40 °C
(-19.5/+70 °C)
0 °C
0
(-19.5/+70 °C)
28 °C
(-19.5/+70 °C + OFF)
15 °C
(-19.5/+70 °C + OFF)
-19,5 °C
(-19.5/+70 °C + OFF)
8 °C
(0/+10 °C)
-5 °C
(-19.5/+30 °C)
*4
*4
F : Floor
C = Celsius
(nU = numerical 0-100 %)
SP = Setpoint
(tP = actual temp.)
0
(+/- 10 °C)
On
(OFF)
20 minutes
(10-60 min)
0.3 °C
(0.3/10 °C)
no = normally open
(nc = normally closed)
© 2012 OJ Electronics A/S
Example: The setpoint is 25 °C.
Frost protection = 8 °C means temp. setting = 8 °C.
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).
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 actual room temperature.
Application
Sets thermostat function. Select the required control type. Four
alternatives exist:
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"  "Lo")
after selecting the Li option under APp. When
the recorded temperature is above the tem-
perature specified in "Li"  "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"  "Lo", the relay cuts out and "Lo" ap-
pears on the display.
Limit function (APp  Li) should be selected if
a limit is required for when heating is permit-
ted 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 regula-
tor and no sensors are used. The setting is in
per cent.
"Regulator" mode in combination with
"Night setback"
If both Regulator mode (APp  C) and "Night
setback" are selected, night setback is set in
relative values while frost protection is set in
absolute values in per cent.
The setpoint specifies (in per cent) the time
the unit is to remain active in a PWM cycle,
which is usually 20 min, while 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
night setback is set to 25 %, the activation
degree will be (0.60 x 0.25 = 0.15) = 15 %.
Graphic example:
Local
Setpoint
in APP "C"
mode
The diagram should be read as follows:
English
Setpoint
nSb Setback
nSb Activation
degree