The aerial symbol complete with radio wave symbols in the display of the HRT4–ZW
thermostat indicates that it is communicating satisfactorily with the ASR-ZW receiver.
A flashing radio wave indicates a loss of communication. This may be temporary and
can often be restored by turning the thermostat dial and increasing or decreasing the
temperature to make the thermostat switch. If this has no effect please see Z-Wave
pairing instructions on page 10.
A radio mast symbol with no radio waves indicates that the HRT4-ZW has not been
signed on to enable it to communicate with the ASR-ZW receiver. In this case you
may wish to contact the Installer as the indication is that the product has not been
commissioned when the installation took place. Alternatively see the Z-Wave pairing
instructions on page 10.
Further information on how the thermostat operates is contained in the ‘Explanation
for householders’ that precedes this section.
The display will show the
required temperature setting
and can be adjusted in
increments of 1°C.
To adjust the required
temperature setting turn the
dial anti clockwise to decrease
it and clockwise to increase it.
When the
thermostat is in
the ‘call for heat’
condition a flame symbol
will appear in the display.
Pressing the temperature
setting dial will allow the
user to check the current
actual measured room
temperature which will be
displayed for approx 7 seconds
before returning to the set
temperature.
The Horstmann HRT4-ZW thermostat uses the latest control technology to provide extremely
accurate temperature control which will help to keep your energy usage as low as possible without
affecting your comfort levels. In fact comfort levels may well be improved as the control accuracy
should ensure that the room does not ‘overheat’ before switching off.
User Instructions
3
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