I N S T R U C T I O N S
© 2016 OJ Electronics A/S
1
67032B 09/16 - (HKT)
Type MCC4/MCD4
English
INTRODUCTION
The thermostat is an electronic on/off thermo-
stat for temperature control by means of an
NTC sensor located either externally or inter-
nally within the thermostat.
The thermostat is for flush mounting in a wall
socket. A baseplate for external wall mounting
is available.
IMPORTANT SAFETY INSTRUCTIONS
Warnings
To avoid electric shock, disconnect
the heating system power supply at
the main panel before carrying out any
work on this thermostat and associ-
ated components.
Installation must be carried out by qualified per-
sonnel in accordance with appropriate statutory
regulations (where required by law).
Installation must comply with national and/or
local electrical codes.
Cautions
This instruction must be observed, oth-
erwise the liability of the manufacturer
shall be voided.
Any changes or modifications made
to this thermostat shall void the liability of the
manufacturer.
Maximum product lifetime is achieved if the
product is not turned off but set at the lowest
possible set point / frost protection when heat is
not required.
Notice
The language used in the original docu-
mentation is English.
Other language versions are a transla-
tion of the original documentation.
OJ cannot be held liable for any errors in the
documentation. OJ reserves the right to make
alterations without prior notice.
Content may vary due to alternative software
and/or configurations.
PRODUCT PROGRAMME
Thermostat
MCC4-1991-UA Clock-thermostat incl. floor
sensor.
MCC4-1999-UA Clock-thermostat with built-in
room sensor.
MCD4-1999-UA Clock-thermostat with 2 sen-
sors. Floor sensor and built-in
room sensor.
INSTALLATION
Mounting of sensor
The terminals for the sensor contain a safety
extra-low voltage (SELV) circuit, allowing the
sensor to be placed as close to the floor surface
as necessary without the risk of electric shock,
should the sensor cable become damaged
Sensor cable recommendations
The following recommendations apply to all
temperature sensor cables:
The sensor cable may be extended with ad-
ditional two-core cable (max. sensor extension,
see technical specification).
The two wires from the sensor to the thermostat
must be kept separate from high voltage wires/
cables. Place the sensor cable in a separate
conduit or segregate it from power cables in
some other way. Never use two vacant wires in
a multi-core cable.
Shielded cable does not connect the shield to
earth (PE).
Mounting of external floor sensor
Insert the cable and sensor into a non-conduc-
tive conduit embedded in the floor.
The end of the conduit must be sealed and
the conduit placed as high as possible in the
concrete layer.
The floor sensor must be centred between
loops of heating cable.
Mounting of thermostat with built-in room
sensor
The thermostat must be mounted on the wall
approx. 1.4 - 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.
Opening the thermostat
1. Slide the power button down to Off “0”.
2. Release the front cover ONLY by inserting a
small screwdriver into the hole on either side
of the thermostat (fig. 1).
Connections
Ensure that the main and load cables are con-
nected as shown in the figure.
Term. 1: Neutral (N
Term. 2: Phase (L) 230 V ±10%, 50/60 Hz
Term. 3–4: Load, max. 16 A / 3600 W
Term. X: Do not connect
Term. 5-6: External floor sensor
Mounting of thermostat
1. Connect the wires in accordance with the
diagram (fig. 2).
2. Mount the thermostat in the wall socket.
Please note that the adapter plate is properly
clipped on the thermostat.
3. Fit the frame and carefully press the cover
onto the thermostat. Ensure that both the
power slide button on the cover and the
power switch pin are down.
4. Click the cover into place by applying light,
even pressure.
Warning!
Do not apply pres-
sure to the corners of the display cover.
DO NOT
open the thermostat by releasing the
four fixing clips on the back.
OPERATING THE THERMOSTAT
First time settings:
The first time the thermostat is connected, push
the power slide button to On “I”. Language, time
and date must be set using the buttons:
1. Set language
2. Set time
3. Set date
Programming
See 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. 5).
Error codes
E0: Internal error. The thermostat must be
replaced.
E1: Built-in sensor short-circuited or
disconnected.
E2: External sensor short-circuited or
disconnected.
E5: Overheating, The temperature is too high in
the thermostat and switch off the heating.
MAINTENANCE
The thermostat is maintenance free.
Keep the thermostat’s air vents clean and unob-
structed at all times.
The thermostat may only be cleaned with a dry
cloth.
APPROVAL AND STANDARDS
Regulations
OJ Electronics A/S hereby declares that the
product is in conformity with the following direc-
tives of the European Parliament:
LVD
- Low Voltage Directive
EMC - Electromagnetic Compatibility
RoHS - Restriction of the use of certain
Hazardous Substances
WEEE - Waste Electrical and Electronic Equip-
ment Directive
Applied standards
According to the following standard:
EN 60730-1
EN 60730-2-9
Classification
Protection from electric shock must be assured
by appropriate installation. Must be installed
according to the requirements of Class II (rein-
forced insulation).
DISPOSAL AND RECYCLING
Environment and recycling
Protect the environment by disposing of the
package in compliance with local regulations
for waste processing.
Recycling of obsolete appliances
Equipment containing electrical
components must not be disposed
of along with domestic waste.
It must be separately collected to-
gether with electrical and electronic
waste in accordance with current
local regulations.
TECHNICAL SPECIFICATIONS
Safty
Control pollution degree ................................... 2
Software class ................................................. A
Built-in circuit breaker .................... 2-pole, 16 A
Enclosure rating .......................................... IP 21
Overvoltage category ...................................... III
Rated impulse voltage ................................. 4 kV
Ball pressure temperature (TB) ................. 125°C
SELV limits realised .............................. 22 V DC
Temperature range (ambient) ............... +0/+25°C
Supply
Voltage ....................... 230 VAC ±10% 50/60 Hz
Max. pre-fuse .............................................. 16 A
Output
Output relay ............. Make contact - SPST - NO
Output ................................ Max. 16 A / 3600 W
Mounting
Terminal wire size .......................... 1.5 - 2.5 mm
2
Method of mounting ...................................Must
be mounted independently in a wall box in the
fixed installation.
