HVAC / Ventilation Systems
Bosch Fan 1500 Bathroom Extractor Fan
Quick guide for the Bosch Fan 1500 bathroom extractor fan. Includes installation steps, wiring diagrams, humidity sensor settings for DH models, and maintenance instructions.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The Bosch Fan 1500 is a bathroom extractor fan designed for permanent indoor wall installation. It is available in a standard version and a DH version equipped with a humidity sensor and timer. The device is IP24 rated and must be installed by qualified personnel in accordance with local regulations.
Application and operating conditions
- Designed for continuous operation in buildings.
- Suitable for transporting normal or slightly dusty air (particle size
- Maximum ambient temperature: +40°C.
- Not suitable for ceiling installation.
- Not suitable for use at altitudes above 2000m.
- Do not use to circulate air containing flammable gases, vapors, or sticky/corrosive contaminants.
Installation
Installation must be performed by qualified personnel. Ensure the power supply is disconnected before starting.
Installation steps
- Determine the installation location.
- Prepare the power cable (NYM-O 2x1.5 mm², NYM-O 3x1.5 mm², or NYM-J 3x1.5 mm² depending on the model).
- Remove hole plugs (9) and drill holes for the fan and ø6mm fixing pins.
- Remove the electrical cover (2) and pass the double-insulated cable through the passage (4).
- Before fixing, remove foreign objects, check that the rotor rotates freely, and ensure there is space for the check valve shutter.
- Secure the fan body (5) to the wall using screws and fixing plugs.
- Connect the cable according to the appropriate wiring diagram.
- For DH models, adjust the time delay and humidity sensor sensitivity using the potentiometers (7) on the controller (8).
- Attach the front panel (1) to protect against moving parts.
Operation (DH models)
DH models feature a humidity sensor and timer. The humidity detection system is the master system.
- Automatic operation: The fan starts automatically when humidity exceeds the set value (40% to 90% relative humidity). It stops after the humidity drops below the set value and the stop delay time has elapsed.
- Manual operation: If connected via a light switch or separate switch, the fan can be started manually. It will stop after the set delay time, provided the humidity is below the set level.
- Settings: The stop delay time can be adjusted from 3 to 30 minutes using the potentiometer.
Maintenance and cleaning
- Disconnect the fan from the power supply before any maintenance.
- Clean the front cover and visible parts with a damp cloth.
- Do not use aggressive solvents, high-pressure cleaners, or water jets.
- Ensure no water enters the electric motor or terminal box.
- Technical inspections of the rotor should be performed at least every 6 months.
Manufacturer information
Bosch
Practical help
Common problems
Fan does not start
Check power supply and electrical connections. For DH models, check if the humidity level is below the set threshold on the potentiometer.
Excessive vibration or noise
Check the rotor for damage or contamination. If the issue persists, have the product serviced by a qualified electrician.
Before use
- Ensure power is disconnected before installation.
- Check wall structure load-bearing capacity.
- Verify rotor rotates freely by hand.
- Ensure enough space for check valve shutter opening.
- Confirm cable type matches the equipment variant.
Images and diagrams
- Fig 2: Wiring diagram for standard model.
- Fig 3/4: Wiring diagram for DH model with humidity sensor.
- Fig 5: Installation dimensions and cable routing.
- Fig 6: Product dimensions for different models.
Model compatibility
- Not suitable for ceiling installation.
- Not suitable for use above 2000m altitude.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.