Sensor Installation - OJ Electronics MTD2 User Manual

Type MTC2 / MTD2 with room or floor sensor
Pollution class: 2
Pollution class 2, representative of air circulation in typical homes.
Overvoltage category: III
Pulse voltage 4 kV to IEC 60664-1.

Sensor installation

Floor sensor:
The fl oor sensor should be installed in standard conduit embedded
in the fl oor. The conduit should be sealed and positioned as close
to the fl oor surface as possible.
Room sensor:
The room sensor should be installed in a standard wall box or
mounted direct on the wall. Sensor cables can be extended up to a
maximum of 50 m in length using power cable. Two wires in a multi-
wire cable must, however, not be used if the cable is also used to
supply power to heating cables. The best result is achieved if a se-
parate cable, installed in a separate conduit, is used for the sensor.
Installation of thermostat
Built-in or external room sensor
The thermostat or external room sensor should be mounted on a
wall in such a way as to allow free air circulation around it. It must
also be positioned so as to prevent it from being affected by direct
heat sources (e.g. the sun), draughts from doors and windows,
or outside temperature (i.e. do not mount on outer walls). The
thermostat has a built in fault circuit which switches the heating off
if the sensor is disconnected or short-circuited.
Thermostat installation
- Open cover.
- Unscrew cover and remove.
- Connect wires from rear as shown in wiring diagram.
- Mount thermostat in wall box - fi t frame and cover. Please note
that the adapterplate is properly clipped on the thermostat.
Parameter
Max. temperature
Min. temperature
Max. limit temperature FLOOR
Min. limit temperature FLOOR
Measure fl oor temperature
Measured room temperature
Application
Offset
Night setback/ECO
*1 : Only available if fl oor sensor is not installed
*2 : Only available if fl oor sensor is installed
If Controller (C) is selected under Application, the fl oor and room sensors are disconnected and heating is controlled on a scale of 0-10,
corresponding to 0-100% activated
2
Shown on display
SCA  Hi  40
SCA  Lo  0
Li  Hi  28
Li  Lo  15
FLo  24.5
ro  21.5
APp  A : Room sensor *1
 F : Floor sensor *2
 AF : Room with Limit sensor *2
 C : Controller
oFF 
nSb 
© 2010 OJ Electronics A/S
Temperature setting
Interrupter
The thermostat has a temperature setting range of 0-40°C.
Set the wanted temperature with the arrow buttons, the set tempe-
rature shows in the display. The thermostat will calculate the best
way to control the heating system in order to achieve the desired
temperature. If necessary, fi ne adjustment can be performed after
1 or 2 days.
Night setback
The night setback/economy temperature function is activated via
a 230 V signal from an external timer connected to terminal S.
The function is factory set to 5°C (2-8° OTD2). The LED lights green
when the economy signal is active and red when heating is active.
Frost protection
If the signal is connected via a rectifi er diode, the thermostat will
maintain a fl oor/room temperature of 5°C.
Settings
To set parameter values, press and hold the programming button
for 3 seconds. SCA  Hi  40 will be shown on the display. First-
ly, SCA will be displayed for 1 second, followed by Hi, and fi nally
40. The required value can then be set using the arrow buttons. To
access the next parameter, press the programming button again.
If no buttons are pressed for 30 seconds, the program returns to
the initial display.
Factory setting OTD2 -1999
OJ standard
40°C (0-40°C) •
0°C (0-40°C) •
28°C (15-55°C) •
15°C (5-30°C) •
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0 0 (+/- 3°C) •
5 5°C (2-8°C) •
English
LED
Increase temperature
Programming button (P)
Decrease temperature
OTN2 -1991 OTN2 -1999
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