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14. Radio transmission interference
Ranges and interference
• The FS20 wireless control system (to which the FHZ1000 and the actuator belong) uses the 868 MHz range, which is
also used by other radio services. Therefore devices that operate on the same or neighbouring frequencies may restrict
both its operation and its range.
• The specified range of up to 100m is the free-field range, which means the range with visual contact between the
transmitter and receiver. In practice, however, walls, ceilings, etc. between the transmitter and the receiver may affect
and reduce the range.
Other causes of reduced ranges:
• All types of high-frequency interference
• Any buildings or vegetation
• Conductive metal parts that are located near the devices or within or near their transmission path, for example, radiators,
metallised insulation glass windows, reinforced concrete ceilings, etc.
• Influence on the radiation pattern of antennas due to the distance from the transmitter or receiver to conductive surfaces
or objects (also to human bodies or the ground)
• Broadband interference in urban areas that reduces the signal-to-noise ratio; the signal is no longer recognised due to
this ‘noise’
• Interference radiation resulting from insufficiently shielded electronic devices, for example, operating computers or
similar
15. Handling
• Protect the product against humidity, cold, heat, dust, and direct sunlight.
• Never dismantle the product. Only have the device repaired by a skilled technician otherwise the device’s licence will
become invalid.
• Even a fall from a low height can damage the product.
16. Maintenance and cleaning
The product requires no servicing except for battery replacement; never dismantle it.
Clean the product with a soft, clean, dry and lint-free cloth. You can also very easily remove dust using a clean, soft brush
and a vacuum cleaner.
Do not use solvent-based cleaning agents, as these may damage the surface of the plastic casing and its inscription.
FHT 8W Heat Demand Relay
Installation and User Guide
Product Code EHC-FH06
1
