1. Introduction and Overview
The Bosch Cerapur Compact ZWB 24-1 D E is a highly efficient gas condensing boiler designed for both heating and domestic hot water production. This compact unit combines advanced technology with user-friendly features to provide reliable and economical performance for indoor installations. It is engineered to deliver maximum efficiency and high comfort, making condensation technology more accessible.
Key features include a nominal thermal power of 24 kW, an efficiency of 87.8% at nominal thermal power and high temperature, and an energy class A rating for both heating and service water. The boiler incorporates the Bosch Heatronic BUS system with an LCD display and offers a wide range of continuous power modulation (1:8 for sanitary and heating). It supports electronic conversion between methane gas and LPG and features a patented algorithm for active and passive optimization via the SolarInside-ControlUnit, allowing integration with thermal solar systems.
Image 1: Front view of the Junkers Bosch Cerapur Compact ZWB 24-1 D E gas condensing boiler.
2. Safety Information
This appliance must be installed, commissioned, and serviced by a qualified and certified professional in accordance with all local and national regulations, standards, and codes of practice. Failure to comply with these instructions can result in serious injury, property damage, or death.
- Gas Safety: Ensure all gas connections are made by a qualified gas engineer. Regularly check for gas leaks.
- Electrical Safety: All electrical work must be carried out by a qualified electrician. Ensure the appliance is properly earthed.
- Ventilation: Maintain adequate ventilation as required by local regulations for gas appliances.
- Water Pressure: Do not exceed the maximum permissible water pressure for the heating system.
- Frost Protection: If the boiler is installed in an unheated area, ensure proper frost protection measures are in place.
- Children and Pets: Keep children and pets away from the appliance during operation and maintenance.
For outdoor installation, the boiler must be placed in a partially protected location, strictly adhering to all applicable regulations and manufacturer guidelines.
3. Installation and Setup
Installation of the Cerapur Compact ZWB 24-1 D E boiler requires specialized knowledge and must be performed by a certified technician. This section provides general guidance; refer to the detailed installation manual provided with the product for specific instructions.
3.1 Site Selection
Choose a suitable location for wall mounting, considering accessibility for maintenance, ventilation requirements, and proximity to gas, water, and electricity supplies. The boiler dimensions are approximately 40 cm (width) x 40 cm (depth) x 82 cm (height).
Image 2: Dimensions of the Junkers Bosch Cerapur Compact ZWB 24-1 D E gas condensing boiler.
3.2 Mounting and Connections
- Mounting: Use a special mounting plate or fittings for hydraulic connections (available as accessories) to securely wall-mount the boiler.
- Flue Gas System: The boiler is suitable for use with 60 mm diameter drains. Ensure the flue gas system is installed correctly and sealed.
- Gas Supply: Connect to the methane gas supply. The boiler supports electronic conversion to LPG if required.
- Water Connections: Connect the heating circuit and domestic hot water lines. The heating side includes an 8-liter expansion vessel and a filling valve.
- Electrical Connection: Connect the boiler to the electrical supply according to local regulations.
3.3 Control System Integration
The boiler can be integrated with various control systems:
- Temperature Controllers: Compatible with CR 100 or CW temperature controllers.
- Smart Control: Operation with the Bosch Control CT100 (accessory) digital modular room temperature controller, featuring a soft-touch display and an intelligent app for remote control.
- Remote Control: Remote control via MB LAN2 modules (accessories) is possible.
4. Operation
The Cerapur Compact ZWB 24-1 D E boiler is designed for intuitive operation via its integrated LCD display and compatible external controls.
4.1 Initial Start-up
Initial start-up must be performed by a qualified technician to ensure all systems are functioning correctly and safely.
4.2 Basic Controls
- LCD Display: The Bosch Heatronic BUS system features an LCD display for monitoring operational status, temperatures, and error codes.
- Temperature Adjustment: Adjust heating and domestic hot water temperatures using the controls on the boiler or via a connected room thermostat (e.g., CR 100, CW, or Bosch Control CT100).
- Operating Modes: Select desired operating modes (e.g., heating only, hot water only, heating and hot water) as per the control system's interface.
4.3 Advanced Features
- Power Modulation: The boiler automatically adjusts its output (1:8 modulation ratio) to match the heating demand, optimizing fuel consumption.
- Gas Type Conversion: The electronic system allows for conversion between methane gas and LPG, which should be configured by a qualified technician.
- Solar Integration: The SolarInside-ControlUnit optimizes the boiler's operation when combined with thermal solar systems for heat integration and domestic hot water production.
5. Maintenance
Regular maintenance is crucial for ensuring the long-term efficiency, safety, and reliability of your Bosch Cerapur Compact ZWB 24-1 D E boiler. All maintenance work must be carried out by a qualified and certified service technician.
5.1 Annual Inspection
It is recommended to have the boiler inspected and serviced annually by a qualified professional. This typically includes:
- Cleaning of the heat exchanger and burner.
- Checking and adjusting gas pressure.
- Inspecting the flue gas system for blockages or leaks.
- Checking the expansion vessel and system pressure.
- Verifying the proper function of safety devices.
- Checking electrical connections.
5.2 User Checks
Users can perform basic checks between professional services:
- System Pressure: Monitor the system pressure gauge. If the pressure is too low, consult your installation manual for instructions on refilling the system or contact a technician.
- Visual Inspection: Periodically check for any visible leaks, unusual noises, or odors. If any issues are detected, contact a qualified technician immediately.
6. Troubleshooting
If your Bosch Cerapur Compact ZWB 24-1 D E boiler experiences an issue, the LCD display may show an error code. Consult the detailed product manual for a list of error codes and their corresponding solutions. For most issues, it is recommended to contact a qualified service technician.
6.1 Common Issues and Actions
- No Heating/Hot Water: Check if the boiler is powered on, the gas supply is open, and the system pressure is adequate. Verify thermostat settings.
- Low System Pressure: If the pressure gauge indicates low pressure, the system may need to be refilled. Refer to the installation manual or contact a technician.
- Unusual Noises: Gurgling or banging noises may indicate air in the system or other issues. Contact a technician.
- Error Codes: Note any error codes displayed on the LCD and provide them to your service technician.
Do not attempt to repair the boiler yourself. Always contact a qualified and certified service technician for diagnosis and repair.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | Bosch |
| Model | ZWB 24-1 D E |
| Part Number | 7736900726 |
| Product Dimensions (H x W x D) | 82 cm x 40 cm x 40 cm |
| Weight | 30 kg |
| Color | White |
| Nominal Thermal Power | 24 kW |
| Efficiency (Nominal Thermal Power, High Temp) | 87.8% |
| Energy Class (Heating & Service Water) | A |
| Energy Source | Methane Gas (LPG convertible), compatible with Thermal Solar Systems |
| Expansion Vessel Capacity | 8 liters (heating side) |
| Flue Diameter Compatibility | 60 mm |
| Certifications | B23, B33, C13, C33, C43, C53, C63, C83, C93 |
| Emissions Class | Class 5 (UNI EN 297, UNI EN 483, UNI EN 15502) |
| Special Features | Compact design, Heatronic BUS system with LCD, 1:8 continuous power modulation, SolarInside-ControlUnit |
| Included Components | Condensation boiler Cerapur Compact Zwb24-1D and Erp |
8. Warranty and Support
For information regarding the warranty period and terms for your Bosch Cerapur Compact ZWB 24-1 D E boiler, please refer to the warranty card included with your product or contact your authorized Bosch dealer or installer. Warranty conditions may vary by region and purchase date.
For technical support, service requests, or to locate an authorized service partner, please visit the official Bosch Heating website or contact their customer service department. Always provide your model number (ZWB 24-1 D E) and part number (7736900726) when seeking support.
Online Resources: Bosch Thermotechnology Official Website
