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6. Initial system operation
a) Inserting batteries into the ‘FS20 STR’ wireless thermostat,
replacing the batteries
• Slide down and remove the wall holder on the back side of the wireless thermostat.
• Slide down and remove the cover of the battery compartment (in direction of the arrow on
the cover).
• Insert two high-quality alkaline AA batteries; ensure correct polarity. You will find corre-
sponding figures in the battery compartment.
Make sure to insert the batteries correctly to avoid damage to the wireless
thermostat’s electronic components.
The ‘FS20 STR’ wireless thermostat can be powered using rechargeable
batteries. However, due to their lower voltage (rechargeable battery = 1.2V,
battery = 1.5V) and lower capacity, the period of operation and wireless range
are reduced.
Therefore, to ensure safe operation, please only use high-quality alkaline
batteries.
• Close the battery compartment again.
• The wireless thermostat performs a short display test. After the display test, you may set
the date and time.
• If the battery icon (‘ ‘) appears, the batteries are used up and should be changed as soon
as possible. The same applies if the radio range decreases or if data are no longer
displayed on the LC display.
