2. Intended Use
The "FHT 8W" Demand Control Heating Relay analyses the communication between the FHT system
thermostats and the associated radiator valve drives.
It can then control the heating system (boiler) correspondingly to the actual heating demand (direct
connection to boiler control and or circulation pump via a switching output).
Chapter 6 provides a detailed description of functions.
Any use other than that described above could lead to damage to this product and involves the risk
of short circuits, fire, electric shock, etc.
No part of the product can be modified or rebuilt.
Please read this operating manual completely and carefully before first operation;
it contains important information specific to the correct use of the device.
3. Contents
• "FHT 8W" Demand Control Heating Relay
• Operating Instructions
4. Explanation of Symbols
The symbol with the lightning bolt in the triangle is used when there is a health/safety
risk, e.g. through an electric shock
The icon with the exclamation mark in a triangle points out particular dangers
associated with handling, function or operation.
The "Hand" symbol indicates special tips and operating information.
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