KOSPEL KDE3 & KDE5 Electric Instantaneous Water Heater

Safety Information

This appliance can be used by children aged from 3 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge, if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.

⚠️ Important Safety and Usage Conditions:

• Read and strictly follow all installation and operating instructions to ensure long life and reliable operation.
• The unit is designed for wall mounting only.
• Intended for heating DHW in households, sanitary facilities, laboratories, workshops, etc.
• Use only when in perfect technical condition and correctly assembled.
• If a non-return valve is installed, a safety valve must be fitted between the unit and the non-return valve.
• Inlet and outlet pipes should not be made of plastic.
• Maximum inlet water temperature must not exceed 60°C.
• Always vent the unit before initial start-up and after any water drainage (e.g., after plumbing work).
• Electrical connection and fire protection testing must be performed by a qualified electrician.
• The water heater must be connected to protective grounding. The quality of the grounding should be checked periodically by a qualified electrician. Installation on grounded steel or copper fittings is recommended.
• Electrical installation must be equipped with a high-sensitivity residual current device (max. 30 mA). A separate four-pole residual current circuit breaker (10 or 30 mA) for the water heater circuit is recommended.
• Ensure electrical installation includes residual current protective devices and other solutions to disconnect the heater from the power source (poles spaced at least 3 mm).
• Do not install in areas exposed to explosion risk or where temperatures can drop below 0°C.
• Storage in rooms where temperature drops below 0°C may cause damage and void warranty.
• Do not operate when the unit or pipes are empty of water.
• Never open the unit's cover while power is on.
• Failure to install a water filter can cause unit damage.
• Scale buildup can reduce water flow and damage the heater (damages not covered by warranty). Periodically descale the unit and fittings.
• Hot water (above 40°C) can cause discomfort and be dangerous for children. Temperatures above 50°C can cause first-degree burns, especially to children.
• Electronically controlled heaters are sensitive to surges; electrical installation must include surge protection devices.
• Mount the unit to allow easy access for service and repair, maintaining a minimum distance of 100 mm from walls and ceiling.

Installation and Assembly

Follow these steps for installation:

1. Use the provided template to mark the mounting location and drill points for screws.
2. Bring water system pipes and electric supply cables to the marked locations.
3. Remove the unit's cover.
4. Install the heater on fixing screws, feeding the supply wire through the hole first.
5. Connect the unit to the electric mains.
6. Remove rubber plugs from cold and hot water fittings.
7. Connect the unit to the water supply system.
8. Open the cold water valve and check for leaks.
9. Vent the water system (refer to "Venting" section).
10. During installation, check the safety switch activation (applies to first connection only).
11. Re-attach the unit's cover.
12. Ensure no access to live parts through the rear plate holes.

Safety Switch: Ensure the safety switch is correctly engaged. If the safety switch triggers during operation, contact service immediately. Re-engaging it and continuing to use the device may cause severe damage.

Venting

1. Shut off electric supplies to the heater.
2. Turn on the hot water tap to vent the installation for 15-30 seconds until water flows steadily.
3. Switch on the electric supplies.

Configuration

Configuration must be performed before initial start-up with the power supply switched off.

Use the DIP switches (4-position) on the electronic board:

• P (Power Settings): Switches 1 & 2 set the rated power; Switches 3 & 4 set the heating box type.
• F (Other Settings): Switches 1, 2, 3 should remain at factory settings. Switch 4 ON blocks access to heater settings.

After power-up, the display shows software versions and the set rated power.

The heater is factory set to NORMAL mode (30-60°C). For SHOWER mode (30-55°C), contact an authorized service partner.

KDE5 Operation

The heater activates automatically when flow exceeds 2.5 l/min. The control system adjusts power based on water flow, desired temperature, and inlet water temperature.

The LCD backlight and an icon [heating icon] signal heating operation. A flickering icon indicates maximum power is insufficient for current conditions.

Standby mode activates after heating or 50 seconds of inactivity.

Blockage: A master appliance signal (NA input) displays "EXT BLOCKED".

Error Messages: Errors are indicated by an 'E' icon and message:

• ER>T INLET: Inlet sensor failure.
• ER> T MAX: Maximum temperature exceeded.
• ER> AIR 1: Air detected in heating box (equipment detection).
• ER> AIR 2: Air detected in heating box (software detection).

In case of ER> T MAX, ER> AIR 1, or ER> AIR 2, heating stops. Normal operation resumes after the fault is resolved and adequate water flow is restored.

Temperature Adjustment:

The current temperature is displayed on the LCD. Turn the knob right to increase, left to decrease. Press the knob to select stored settings (ECO, SINK, BATH).

To change stored temperature settings:

• Select the desired setting by pressing the knob.
• Press and hold the knob for approx. 3 seconds until the value flashes.
• Turn the knob to set the new value.
• Press the knob to confirm.

Save the new value within 10 seconds, or it will be lost.

Configuration and Parameters View:

Set minimum temperature, then press and hold the knob for 5 seconds until ">T SETPOINT" appears. Turn the knob to select values. Some parameters are for viewing only (e.g., >T INLET), others for configuration (e.g., brightness, language).

To change a parameter: press the knob (selection flickers), turn to set the new value, press to confirm. If not confirmed within 10 seconds, the display returns to the menu.

Parameters are saved upon exiting the menu via [>EXIT].

Selectable Parameters:

• [>T SETPOINT]: Temperature setting (min-max) °C.
• [>T INLET]: Inlet temperature value °C.
• [>T OUTLET]: Outlet temperature value °C.
• [>FLOW]: Flow rate l/min.
• [>POWER]: Percentage of maximum power used %.
• [>T-h]: Operating time.
• [>BRIGH MIN]: Minimum brightness / standby mode.
• [>BRIGH MAX]: Maximum brightness / active mode.
• [>ENGLISH]: Select menu language.
• [>TEMP LIMIT]: Maximum temperature limit setting.
• [>TEST]: For authorized service only.
• [>POWER SET]: Configured power value.
• Check software versions (PW..., MSP...).
• Restore factory settings [>REG USINE] or restart controllers [RESET] (hold knob for 5 seconds).
• [>EXIT]: Save parameters and exit menu.

The menu exits automatically after 5 minutes of inactivity without saving changes.

KDE3 Operation

The heater activates automatically when flow exceeds 2.5 l/min. The control system adjusts power based on water flow, desired temperature, and inlet water temperature.

Indicators:

• Green: Power supply "on".
• Red: Heating "on".

Other modes are indicated by a flickering green light.

Error Codes (Green Indicator Impulses):

Maintenance

Filter Cleaning:

1. Cut off power and cold water supplies.
2. Take off the unit's cover.
3. Unscrew the cold water inlet fitting.
4. Remove the mesh filter from the inlet fitting.
5. Clean the mesh filter.
6. Reinsert the filter and gasket, then tighten the inlet fitting.
7. Open the cold water shut-off valve and check connections for leaks.
8. Re-attach the unit's cover.
9. Vent the water system (see "Venting section").

Co-operation with Other Appliances:

The unit is equipped with BLOCK and NA terminals.

• BLOCK: Relay output that switches off a slave appliance. The circuit connected to BLOCK terminals (max. 0.1A, 250V~) opens when heating starts.
• NA: Input that locks unit operation. Opened NA contacts lock heating operation, enabling co-operation with a master appliance.

Connections for BLOCK and NA should be made with a 2 x 0.5 mm² cable, run inside the unit on the right side. All connections must be performed by a qualified professional.

Technical Data

Minimal water resistivity at 15°C for KDE5 is 1100 Ωcm.

Recycling Information

This product should not be treated as general communal waste. Disassembled appliances must be delivered to a collection point for electrical and electronic equipment recycling. Proper utilization prevents potential negative environmental impacts. For more information, contact your local government unit, waste management service, or the shop where the product was purchased.