Danfoss Hertta-100/Hertta-200 Wall-Mounted Substation
Instruction Manual
Introduction
You have chosen a high-quality product for your home. We hope you will be as pleased with the substation as those customers we have served for over 30 years!
The Hertta-100/-200 is a substation for connecting one- and two-family houses to district heating networks. The substation is used for heating and domestic hot water.
The Hertta-100/-200 is a reliable, safe, and compact choice with modern design. It utilizes new energy-saving district heating technology and components. The substation includes an insulated cover for increased product safety.
Content Overview
- Application and dimensions
- Safety notes
- Delivery & Storage
- For the property owner
- Installer section: Installation, Pipe connections, Electrification and start-up
- Controller: ECL Comfort 300 controller, Setting up temperatures, Appearance of the controller and button functions
- Installer section: Manual control, Flow temperature limits, Temperature limiting thermostatic function, Sensor displays
- User section: Setting the time and date, Setting the heat curve, Setting room temperature, Setting domestic hot water temperature
- Installer and user section: Basic parameters, settings
- Standard components
- Service
- Trouble shooting
- Dimensioning tables
- Circuit diagram
- Electrical circuit diagram
- Spare-parts list
- Options
- Service book
- General Warranty Conditions
- Disposal Instruction
Installer Section
Installation
Mounting Space Requirements: Leave adequate space around the substation for mounting and maintenance. Ensure extra space below or on the sides to change the expansion tank. Be aware that the substation's operation sound may reach adjacent rooms depending on the location and building materials.
Mounting Procedure:
- Screw the provided rail onto the wall.
- Lift the substation onto the rail.
- Screw the substation to the wall at the bottom edge.
- Attach the insulating cover using magnets.
Before mounting, ensure the wall structure is strong enough to support the substation's weight. A picture of the district heating fittings (sold as an option) is available on page 25. Remember to use proper lifting techniques and do not attempt to move the substation alone.
Pipe Connections
The substation connects to district heating, heating, domestic hot water, and circulation networks as follows:
- 1. District heating supply: Inlet G3/4 internal thread.
- 2. District heating return: Inlet G3/4 internal thread.
- 3. Heating supply: Inlet G1 internal thread (direction selectable).
- 4. Heating return: Inlet G1 internal thread (direction selectable).
- 5. Domestic cold water: Ø 22 Cu pipe.
- 6. Domestic hot water: Inlet G3/4 external thread (direction selectable).
- 7. Domestic hot water circulation: Inlet G3/4 external thread (direction selectable).
- 8. Extraction pipes for safety valves: Ø 15 Cu.
Connection to the district heating network must be performed by a qualified installer accepted by the district heating distributor.
DHW Circulation: Ensure DHW circulation is connected. If your property lacks it, extend it as far as possible into the boiler room or create a short loop (min. 3m, DN15 pipe). Failure to connect DHW circulation may lead to control failures.
Electrification and Start-up
The substation complies with European Directives EMC 89/336/EC and LVD 97/23/EC. Always pull the contact plug when performing maintenance or start-up.
Protect all electrical equipment exposed to moisture or water during start-up. This includes the control box, pumps, and sensors.
Electrify the substation only after all moisture-causing work is finished. Ensure electrical equipment surfaces are dry. Check that no wires are loose.
An electrician is not required for start-up, but if uncertain, consult one for connections.
The contact plug serves as the main electrical switch.
Outdoor Temperature Sensor: Install on the north side of the property, approximately 3m high, away from ventilation windows. Connect the cable to the socket at the bottom of the control box. Remove the substation contact plug before connecting the sensor.
Cable Requirements: Minimum cable area is 0.4 mm², maximum length is 125 m. Protect any joints with shrink cable.
Temperature Limiting Thermostatic Function: This is integrated into the controller. An external thermostat is available as an option.
Start-up Procedure:
- Insert the contact plug into a 10A/220V fused wall socket.
- Wait 10 seconds.
- Turn on circulation pumps P1 (DHW) and P2 (Heating) using the switches on the right side of the controller.
- Do not run pumps without water.
- Change necessary settings on the electronic controller. Refer to pages 7-13 for frequently used functions.
Factory Settings: All Hertta-100/-200 substations are factory-set for floor heating. For radiator heating systems, adjust heat curve settings (p. 11) and maximum flow temperature limits (p. 9).
Pre-Start Checks:
- Pipes connected correctly.
- Expansion tank pre-pressure is correct (factory setting 1 bar).
- Domestic hot water temperature set to +58°C.
- Outdoor temperature sensor installed.
- Controller settings adjusted for radiator heating if applicable.
Start-up Steps:
- Slowly open primary side shut-off valves.
- Open internal network shut-off and filling valves, follow filling procedure using manometers.
- Vent air from networks.
- Ensure pipe connections are tight.
- Check connections for leaks.
- Verify pump rotation direction.
- Confirm flow directions match designs.
- Ensure heat curve settings are appropriate for your heating system.
- Provide operating instructions to users.
Controller: ECL Comfort 300
The ECL Comfort 300 controller manages automatic temperature control for heating and domestic hot water, offering full control over functions and settings. Pump operating switches are located on the right side.
Setting Up Temperatures:
- Domestic hot water temperature: set to +58°C. Return circulation water should be over +55°C.
- Recommended indoor temperatures: Apartments/offices +20°C to +22°C; Stores/industrial buildings +18°C; Warm stock +12°C; Garage +5°C.
District heating supply temperature varies between +70°C and +120°C based on outdoor temperature, with return temperature 25°C below supply. Check temperatures on page 10.
Controller Buttons & Functions:
- Circuit indicator/selector: Selects circuits.
- Shift button: Switches between temperatures, changeover points, etc.
- Adjust button: Adjusts temperatures and values.
- Mode button: Selects operating mode (Manual, Scheduled, Constant comfort, Constant setback, Standby).
Controller Modes:
- Manual operation: For maintenance and service only.
- Scheduled operation: Automatic temperature changes based on schedules and outdoor temperature.
- Constant comfort temperature: Maintains a set temperature, adjusting automatically for outdoor conditions.
- Constant setback temperature: For periods of lower heating demand.
- Standby mode: For periods of no heating.
Installer Section: Specific Procedures
1. Manual Control: Settings are made on the grey side of the ECL Card. Navigate to line B. Use the +/- buttons to adjust values. Do not leave the controller in manual mode after service.
2. Flow Temperature Limits: Settings on the grey side of the ECL Card. Navigate to line 2. Adjust the minimum and maximum flow temperature limits. For radiator heating systems, the maximum flow temperature limit may need adjustment (e.g., 45°C for radiator heating vs. 85°C factory setting).
3. Temperature Limiting Thermostatic Function: Settings on the grey side of the ECL Card. Navigate to line 78 for flow temperature limitation and line 81 for reaction time. This function stops the heating circulation pump if flow temperature exceeds the set limit.
4. Sensor Displays: Displays are visible on the grey or yellow side of the ECL Card. Navigate to line B. Use the shift button to view calculated flow temperatures and return temperature limitations. Change the circuit to view DHW sensor temperatures.
User Section
1. Setting the Time and Date
Settings are made on the grey side of the ECL Card. Navigate to line A. Use the shift button to switch between minutes, hours, years, months, and days. Set the correct time and date. Time and date settings are retained during power outages under 12 hours.
2. Setting the Heat Curve
Settings are made on the grey side of the ECL Card. Navigate to line C. Adjust the slope of the heat curve using the +/- buttons. Use the shift button to adjust the parallel displacement. For radiator heating systems, adjust heat curve settings as per the table (e.g., 1.0 for radiator heating, 0.4 for floor heating).
The heat curve compensates for outdoor temperature changes. Fine-tuning may be necessary based on building heat mass and district heating network conditions. Tips for tuning include starting with a slightly lower setting and adjusting based on comfort and seasonal changes.
3. Setting Your Room Temperature
Settings are made on the yellow side of the ECL Card. Navigate to line A or C. Set the desired room temperature in "Constant comfort temperature" mode. The room temperature display requires a connected room temperature sensor (optional). If the sensor is not connected, the setting still influences property temperature.
If room temperature is too low, first adjust radiator thermostats. If comfort is still not achieved, increase the room temperature setting in the controller.
4. Setting Domestic Hot Water Temperature
Settings are made on the yellow side of the ECL Card. Navigate to line A. Select domestic hot water circuit (II, DHW) and set the desired domestic hot water temperature (recommended 58°C).
Installer and User Section: Basic Parameters, Settings
The controller stores factory settings. Changes can be marked on the tables provided.
ECL Card, Yellow Side (Heating)
| Line | Setting Range | Factory Setting | Setting | Comments |
|---|---|---|---|---|
| A | Room temp. and setback temp. | 20/16 | To change room temp., push [adjust] mode. Change with +/- buttons. |
ECL Card, Yellow Side (Domestic Hot Water)
| Line | Setting Range | Factory Setting | Setting | Comments |
|---|---|---|---|---|
| A | DHW temperature and setback temp. | 58/58 | To change DHW temp., push [adjust] mode. Change with +/- buttons. |
ECL Card, Grey Side (Heating)
| Line | Setting Range | Factory Setting | Setting | Comments |
|---|---|---|---|---|
| C | Heat curve | 0.2 ... 3.4 | 0.4 | Note: Radiator heating typical setting is 1.0. |
| C | Parallel displacement | -9 ... 9 K | 0 K | |
| 1 | Limit for heating cut-out | 10 ... 30 °C | 18 °C | |
| 2 | Flow temperature, min. and max. limits | -10 ... 110 °C | 20 °C | Note: Radiator heating max. temp. to 85 °C. |
| -10 ... 110 °C | 45 °C | |||
| 3 | Room temperature influence min. and max | 0 ... 99 | 0 | |
| -99 ... 0 | -40 | |||
| 4 | Proportional band, Xp | 1 ... 250 K | 100 K | |
| 5 | Integration time constant, Tn | 5 ... 999 s | 20 s | |
| 6 | Running time of motorized control valve | 5 ... 250 s | 96 s | |
| 7 | Neutral zone, Nz | 0 ... 9 K | 3 K | |
| 78 | Flow temperature, max. limitation during heating (thermostatic function) | 10...110 °C | 50 °C | Note: Radiator heating temp. to 90 °C. |
| 81 | Reaction time, ΔTALARM | 5...250 s | 60 s |
ECL Card, Grey Side (Domestic Hot Water)
| Line | Setting Range | Factory Setting | Setting | Comments |
|---|---|---|---|---|
| 4 | Proportional band, Xp | 1 ... 250 K | 60/120 K | |
| 5 | Integration time constant, Tn | 5 ... 999 s | 13 s | |
| 6 | Running time of the motorized control valve | 5 ... 250 s | 15 s | |
| 7 | Neutral zone, Nz | 0 ... 9 K | 1 K | |
| 148 | Acceptable temperature deviation above the desired flow temperature | 1...99 K | 7 K | |
| 149 | Time interval before activation of alarm function | 1...99 min | 10 min |
Standard Components
Pumps:
- Domestic hot water circulation pump (P1): Circulates warm water to ensure fast hot water supply and prevent unnecessary water running. Do not stop this pump even in summer, as it affects control functions. Rotation speed can be adjusted.
- Heating circulation pump (P2): Circulates water between the substation and heating circuits. Its bearings are oiled by water, so it must run year-round. The controller manages its operation in summer by rotating it periodically.
Filling up and Air Venting: Air typically exits the pump automatically. If air venting is needed: Protect electrical components from water, let the pump run, open the air venting screw until air escapes (caution: hot liquid/steam may spurt), then close the screw. The pump may shut down temporarily due to high system pressure.
Control Valves: The substation has an integrated controller with two motorized control valves and a differential pressure controller. The controller manages DHW temperatures based on measured values and heating based on outdoor/flow temperatures. It also ensures valves operate smoothly year-round.
Filling Valve for Heating Circuit (4): Used for filling the heating circuit. Open both shut-off valves until normal network pressure (0.6-1.2 bar) is reached, as indicated on manometer (5). Close both valves once full. Record filling dates; frequent refilling may indicate a leak.
Summer Shut-off Valve (6): Automatically regulated by the controller based on outdoor temperature changes. It is recommended to let the controller manage this function.
Safety Valves (7, 8): Spring-loaded valves that open under excessive pressure to protect closed networks. Test their operation annually by turning the red knob.
Service
Regular maintenance is crucial for optimal operation and early detection of leaks. Perform a general overview twice a year (before and after the heating season). More thorough service should be done annually by authorized personnel.
Always use authorized service personnel. For maintenance and warranty in Finland, contact Danfoss LPM's service organization. For other countries, contact your local Danfoss Sales Company.
Pre/Post-Heating Season Checks:
- No leakages.
- Secondary side pressure as per design (see p. 15, number 5).
- No extraordinary noises.
Annual Service Inspection:
- Check strainer if necessary.
- Check supply and return temperatures.
- Check controller parameters.
- Check pressure drops in heat exchangers.
- Ensure district heating water cooling complies with local DH company requirements.
- Measure pre-pressure in the expansion vessel.
- Verify pump operating point is within the allowed area on the pump curve.
Trouble Shooting
Domestic Hot Water (DHW):
- Problem: DHW smells bad or is coloured. Possible Cause: DHW heat exchanger internal leakage. Solution: Contact local Danfoss Sales Company.
- Problem: DHW temperature changes unusually. Possible Cause: Filter clogged. Solution: Contact district heating distributor.
- Problem: DHW controlling not working or control valve broken. Possible Cause: Trash in control valve or valve broken; Controller broken. Solution: Contact local Danfoss Sales Company. Use "Manual Control" mode to clear trash (p. 8). Contact local Danfoss Sales Company if controller is broken.
Heating:
- Problem: Room temperature too low. Possible Cause: District heating disruption; Filter clogged; Heat curve incorrect; Thermostatic function settings incorrect. Solution: Contact district heating distributor; Check heat curve (p. 11); Check thermostatic function (p. 9).
- Problem: Room temperature too high. Possible Cause: Heating circuit controls failure; Circulation pump stopped. Solution: Contact local Danfoss Sales Company; Turn pump on.
- Problem: Heating control not working. Possible Cause: Low heating circuit pressure; Air in heating circuit; Fouling in heat exchanger; Heat curve incorrect; Controller broken; Manual control mode active. Solution: Add water; Vent air; Contact local Danfoss Sales Company; Check heat curve; Set controller to "Constant comfort temperature" or "Scheduled operation" (p. 7).
- Problem: Water level increase/excess water from safety valve. Possible Cause: Heat exchanger internal leakage; Filling valve leak; Insufficient water/leakage in heating circuit. Solution: Contact district heating distributor/local Danfoss Sales Company; Contact local Danfoss Sales Company; Add water, check for leaks.
- Problem: Heating circuit pressure too low. Possible Cause: Big difference between district heating and heating circuit return temperatures. Solution: Contact local Danfoss Sales Company.
Other Situations:
- Problem: Pump sounds strange. Possible Cause: Air lock in pump; Bearing broken. Solution: Stop pump briefly; Contact local Danfoss Sales Company.
- Problem: Control valve has whistling sound. Possible Cause: Control valve broken. Solution: Contact local Danfoss Sales Company.
- Problem: Water leaks on floor/insulation wet. Possible Cause: Pressure difference too big; Heat exchanger external leakage. Solution: Contact district heating distributor; Contact district heating distributor/local Danfoss Sales Company.
- Problem: District heating pressure/temperature differs significantly. Possible Cause: Disruption in district heating distribution. Solution: Contact district heating distributor.
- Problem: Controller buttons not working. Possible Cause: Buttons locked. Solution: Reinsert ECL Card with yellow side facing you (p. 8).
- Problem: Outdoor temperature not visible. Possible Cause: Sensor connected with power on. Solution: Pull and reconnect substation contact plug.
Dimensioning Tables
Hertta-100: Floor heating, heating for new and old properties
| HEAT EXCHANGERS | Unit | DOMESTIC HOT WATER | FLOOR HEATING new building | HEATING old building | |||||
|---|---|---|---|---|---|---|---|---|---|
| Primary | Secondary | Primary | Secondary | ||||||
| Manufacturer | Oy Danfoss Ab | XB10-1-12 | |||||||
| Type | XB06H-38 | ||||||||
| Capacity | kW | 60 | 17 | 13 | 14 | ||||
| Flow | dm³/s | 0.32 | 0.30 | 0.05 | 0.45 | 0.05 | 0.11 | 0.07 | 0.17 |
| Temperatures | °C-°C | 70-25 | 10-58 | 115-35 | 30-39 | 115-45 | 40-70 | 115-65 | 60-80 |
| Pressure drop | kPa | 9 | 7 | 1 | 18 | 1 | 1 | 1 | 4 |
| Dimensioning pressure | MPa | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
| Material | EN 1.4401 | ||||||||
| CONTROLLERS | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Danfoss | ||||||||
| Type | ECL 300 (F11) | ||||||||
| CONTROL VALVES | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Danfoss | ||||||||
| Type | IHPMM-F | ||||||||
| Flow | dm³/s | 0.32 | 0.05 | 0.05 | 0.07 | ||||
| Pressure drop | kPa | 52.8 | 56 | 43.2 | 98.9 | ||||
| Size/kvs-value | DN/kvs | 15/1.6 | 15/0.25 | 15/0.25 | 15/0.25 | ||||
| CIRCULATION PUMPS | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Wilo | ||||||||
| Type | Star Z 25/6 | Stratos ECO 25/1-5 | |||||||
| Flow | dm³/s | 0.09 | 0.35 | 0.11 | 0.17 | ||||
| Pump head | kPa | 20 | 46 | 21 | 24 | ||||
| Current/Voltage | A | 0.43/230 | 0.46/230 | 0.46/230 | 0.46/230 | ||||
| EXPANSION AND SAFETY EQUIPMENT | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Volume/Pressure drop of the network | dm³/kPa | 12/100 | 12/100 | 12/100 | |||||
| Volume of the expansion tank / pre-pressure | dm³/kPa | 15/250 | 15/250 | 15/250 | |||||
| Size of the safety valve / opening pressure | DN/kPa | 15/1000 | |||||||
| N:o | Quantity | Equipment | Dimensioning | ||||||
| 1 | Differential pressure controller | DN 15/4.0 | |||||||
| 1 | Flow switch | ||||||||
Hertta-200: Floor heating, heating for new and old properties
| HEAT EXCHANGERS | Unit | DOMESTIC HOT WATER | FLOOR HEATING new building | HEATING old building | |||||
|---|---|---|---|---|---|---|---|---|---|
| Primary | Secondary | Primary | Secondary | ||||||
| Manufacturer | Oy Danfoss Ab | XB10-1-30 | |||||||
| Type | XB06H-52 | ||||||||
| Capacity | kW | 82 | 42 | 42 | 36 | ||||
| Flow | dm³/s | 0.44 | 0.41 | 0.13 | 1.12 | 0.15 | 0.34 | 0.18 | 0.44 |
| Temperatures | °C-°C | 70-25 | 10-58 | 115-35 | 30-39 | 115-45 | 40-70 | 115-65 | 60-80 |
| Pressure drop | kPa | 9 | 8 | 1 | 19 | 1 | 2 | 2 | 6 |
| Dimensioning pressure | MPa | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1,6 |
| Material | EN 1.4401 | ||||||||
| CONTROLLERS | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Danfoss | ||||||||
| Type | ECL 300 (F11) | ||||||||
| CONTROL VALVES | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Danfoss | ||||||||
| Type | IHPMM-F | ||||||||
| Flow | dm³/s | 0.44 | 0.13 | 0.15 | 0.18 | ||||
| Pressure drop | kPa | 41 | 53.9 | 71 | 103 | ||||
| Size/kvs-value | DN/kvs | 15/2.5 | 15/0.63 | 15/0.63 | 15/0.63 | ||||
| CIRCULATION PUMPS | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Manufacturer | Wilo | ||||||||
| Type | Star Z 25/6 | Stratos Para 25/1-8 | |||||||
| Flow | dm³/s | 0.12 | 1.12 | 0.34 | 0.44 | ||||
| Pump head | kPa | 20 | 49 | 32 | 36 | ||||
| Current/Voltage | A | 0.43/230 | 0.93/230 | ||||||
| EXPANSION AND SAFETY EQUIPMENT | Unit | DOM. HOT WATER | FLOOR HEATING | HEATING | HEATING | ||||
| Volume/Pressure drop of the network | dm³/kPa | 12/100 | 12/100 | 12/100 | |||||
| Volume of the expansion tank / pre-pressure | dm³/kPa | 15/250 | 15/250 | 15/250 | |||||
| Size of the safety valve / opening pressure | DN/kPa | 15/1000 | |||||||
| N:o | Quantity | Equipment | Dimensioning | ||||||
| 1 | Differential pressure controller | DN 15/4.0 | |||||||
| 1 | Flow switch | ||||||||
QUARANTEED PRESSURE DIFFERENCE IN DISTRICT HEATING NETWORK: kPa
Circuit Diagram
The circuit diagram illustrates the flow of domestic hot water (DHW), district heating (DH) supply and return, and heating (HE) supply and return. It shows the controller (ECL 300), pumps (P1, P2), control valves (TV1, TV2), and various sensors (TE1A, TE1B, TE2A). The diagram details:
- Domestic Hot Water Temperature Control: Controller TC2 regulates valve TV2 based on sensor TE2A, maintaining the set DHW temperature (recommended 58°C).
- Flow Temperature Control in Floor Heating: Controller TC1 regulates valve TV1 based on flow temperature sensor TE1A and outdoor temperature sensor TE1B, maintaining the set flow temperature.
- Temperature Limiting Function in Floor Heating: This function stops the heating circulation pump and closes the control valve if the flow temperature exceeds the maximum limit and reaction time. The pump restarts when the temperature drops below the limit.
Secondary side temperatures can be read from the controller. Options are also indicated.
Electrical Circuit Diagram
The electrical circuit diagram shows the wiring connections for the substation, including the ECL 300 controller, pumps (P1, P2), sensors (TE1A, TE1B, TE2A, TEOA), and control valves (TV1, TV2). It details power supply (230V AC 50 Hz), connections to DHW and Heating circuits, and optional external temperature limiting thermostat (TS1).
Spare-Parts List
A comprehensive list of spare parts with part numbers is provided, illustrating various components such as valves, pumps, sensors, fittings, and the control unit. Key components include:
- Various valves (e.g., DAI5001, DAI5002, SAD101)
- Pumps (e.g., PUW5001/Hertta-100, PUW4981/Hertta-200)
- Sensors (e.g., T103200, T103210, N732350)
- Fittings and connectors (e.g., E070000, DAIA14C)
- Control unit components (e.g., ECL 300, ESM11)
Options
Available options include:
- Set of district heating fittings for inlet and return connections (includes shut-off valve, thermometer, and manometer).
- External temperature limiting thermostat.
- Room temperature sensor Danfoss ESM-10, 087B1164.
Service Book
The service book is for recording the substation's installation date, installer information, and details of regular maintenance performed. This helps track service history and ensure proper upkeep according to manufacturer recommendations.
General Warranty Conditions
Scope of Application and Warranty Provider: Warranty applies to Danfoss LPM heating substations and heat exchangers supplied by Oy Danfoss Ab for district heating use.
Warranty Period: 12 months from initialization or 18 months from delivery, whichever is earlier, for substation components, pipework parts, and heat exchangers.
Scope of Warranty: Covers the component itself, not assembly costs. Danfoss Ab is not liable for faults due to improper installation, wrong operating environment, exceeding pressure limits, external stress, or poor circulation water quality.
Reporting Faults: Faults must be reported to Oy Danfoss Ab within 14 days of detection.
Correcting Faults: Oy Danfoss Ab will deliver flawless goods within a reasonable time for covered faults. Liability is limited and excludes indirect costs.
Settling Disputes: Disputes can be submitted to the Finnish Arbitral Tribunal for settlement, handled in English.
Disposal Instruction
This product should be dismantled and its components sorted for recycling or disposal, following local regulations.
