COLDBUSTER MCD3-1999-OJE6 Digital Thermostat

Introduction

The thermostat is an electronic PWM/PI thermostat for temperature control by means of an NTC sensor located either externally or internally within the thermostat. The thermostat is for flush mounting in a wall box. A baseplate for wall mounting is also available. This thermostat can be used as a controller for electric room heating pursuant to EN 50559.

Contents

• Thermostat
• Sensor

Important Safety Instructions

⚠️ Warning: To avoid electric shock, disconnect the heating system power supply at the main panel before carrying out any work on this thermostat and associated components. Protection against electric shock must be guaranteed by appropriate mounting. The requirements of Class II are fulfilled after appropriate mounting (reinforced insulation).

Installation must be carried out by qualified personnel in accordance with appropriate statutory regulations (where required by law). Installation must comply with national and/or local electrical regulations.

Caution:

This instruction must be observed, otherwise the liability of the manufacturer shall be voided. Any changes or modifications made to this thermostat shall void the liability of the manufacturer.

Installation

Installing the Sensor (Fig. 2)

Insert the sensor cable into a non-conductive 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. 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. Ensure that the insulation is undamaged on both the electrical wiring and the floor sensor. Never use two spare wires in a multi-core cable.

Diagram Description (Fig. 2): Illustrates the sensor cable being laid in a floor heating loop, embedded in a non-conductive conduit within the concrete layer.

Placement of the Thermostat (Fig. 3)

The thermostat should be mounted on the wall approximately 1.5 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.

Diagram Description (Fig. 3): Depicts the thermostat mounted on a wall at approximately 1.5 meters height, showing its placement relative to a door and floor, emphasizing free air circulation.

Opening the Thermostat (Fig. 4)

1. Switch off the thermostat.
2. Insert a small screwdriver in the bottom right slot of the thermostat.
3. Turn the handle of the screwdriver outwards while gently pulling the right side of the bottom a few millimetres towards you.
4. Insert the small screwdriver into the bottom left of the thermostat.
5. Turn the handle of the screwdriver outwards while gently pulling the bottom left side a few millimetres towards you.
6. When the bottom part of the front is loose, pull the front gently away from the rear part.

Diagram Description (Fig. 4): A step-by-step visual guide on how to open the thermostat front cover using a small screwdriver inserted into specific slots.

Mounting the Thermostat (Fig. 5)

Mount the thermostat in the wall box. Ensure that both the power slide button on the cover and the power switch pin in the thermostat are down. Fit the frame and carefully press the cover onto the thermostat - starting with the upper part of the cover, then the lower part of the cover. Click the cover into place by applying light, even pressure. Warning! Do not apply pressure to the corners of the display cover or to the display itself. DO NOT attempt to open the thermostat.

Diagram Description (Fig. 5): Shows the process of mounting the thermostat cover onto the wall-mounted base, starting with the upper part and then the lower part.

Connections (Fig. 6)

Ensure that the mains and load cables are connected as shown in the figure.

• Terminal 1: Neutral: (N / L2)
• Terminal 2: Phase: (L / L1)
• Terminal 3: Load: (N / L2) Resistive load only
• Terminal 4: Load: (L / L1) Resistive load only
• Terminal S: External override* (Activated by a 230V signal, possibly through an external control, clock or timer connected to the S terminal.)
• Terminal 5: Sensor (no polarity)
• Terminal 6: Sensor (no polarity)

Diagram Description (Fig. 6): A wiring diagram illustrating the terminal connections for mains power (N, L), load (L1, L2), external override (S), and sensor (5, 6).

Operating the Thermostat

ON/OFF: To turn the thermostat ON, open the front cover and push the ON/OFF switch up (left side of the thermostat).

Settings: Press the [Settings Button] for 3 seconds to enter settings. Use the [Up Arrow Button] and [Down Arrow Button] to navigate through the settings. Press the [Enter Button] and change the value with the [Up Arrow Button] or [Down Arrow Button]. Press the [Back Button] to return to the settings.

Factory reset: Press the [Settings Button] for 8 seconds to enter the factory reset menu.

Schedule: Press the [Up Arrow Button] and [Down Arrow Button] simultaneously for 3 seconds to enter and change the weekly schedule.

Child lock: Press the [Up Arrow Button] and [Down Arrow Button] simultaneously for 8 seconds to lock or unlock the buttons. This can only be done from the main screen.

Manual override: To activate or deactivate manual override, quickly press and release the [Manual Override Button]. Note: This is indicated with a hand symbol on the main screen when activated. This overwrites the weekly schedule until deactivated again.

Navigation: The [Up Arrow Button] and [Down Arrow Button] are used to adjust the temperature or to navigate through the menu.

You can find the full user manual by scanning the QR code or entering the URL in a browser: https://ojelectronics.com/floorheating/products/digital-thermostat-mcd3

Menu Structure

Diagram Description (Page 9 Diagram): A circular flow chart illustrating the menu structure. It shows entry points for 'daily use settings' and 'initial setup', with sections for 'Settings for daily use', 'Read out values', and 'Settings for installation'.

Key menu items include:

• Daily Use Settings: CLc (Clock), DAY (Day), SchE (Schedule), Lcd1 (Lcd), Lcd2 (Lcd), rCt (Remote controlled temp.), OPEn (Open window), AdAP (Adaptivestart), Adj (Adjust).
• Read Out Values: -5U (Software Version), -FEP (Floor temp.), -rEP (Room temp.).
• Installation Settings: PL (Power Limit), PULS (Pulse Width Modulation), FLLo (Floor limit low), FLHi (Floor limit high), ELLO (Temp. limit low), ELH (Temp. limit high), APP (sensor application), donE (Done).

Settings Details

Error and Warning Codes

• E0 (C-5E): Internal Compensation Sensor Error (Internal fault). The thermostat must be replaced.
• E1 (I-5E): Internal Sensor Error (Built-in sensor defective or short-circuited). Replace the thermostat, or use the floor sensor only.
• E2 (E-5E): External Sensor Error (External sensor disconnected, defective or short-circuited). Reconnect the sensor if disconnected, or replace the sensor.
• E5 (I-OH): Internal OverHeat (Internal temperature limit exceeded). Inspect the installation.

Maintenance

The thermostat is maintenance free. Keep the air vents of the thermostat clean and unobstructed at all times. The thermostat must only be cleaned with a dry cloth.

Approvals and Standards

Regulations

OJ Electronics A/S hereby declares that the product is in conformity with the following directives 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 Equipment
• ECO Design - Environmentally friendly design

Applied standards and approvals

• CE: EN 60730-1, EN 60730-2-9
• UKCA: BS 60730-1, BS 60730-2-9

Classification

Protection from electric shock must be assured by appropriate installation. Must be installed according to the requirements of Class II (reinforced insulation).

Environment and Recycling

Protect the environment by disposing of the package in compliance with local regulations for waste processing. Equipment containing electrical components must not be disposed of along with domestic waste. It must be separately collected together with electrical and electronic waste in accordance with current local regulations.

Technical Specifications

Contact Information

For enquiries, please contact Coldbuster Floor Heating:

• Call: 1800 85 75 65
• Text: 0488 855 826
• Email: support@coldbuster.com.au
• Website: https://www.coldbuster.com.au