adjusting the settings of single radiators so that they give off more (positive
offset) or less (negative offset) heat.
•
Press the ‘PROG’ button until ‘Sond’ appears in the LCD.
•
Use the scroller to select the special ‘OFFS’ function.
•
To confirm your selection, briefly press the ‘PROG’ button.
•
Use the scroller to select the valve operating mechanism/radiator you
require, and confirm your selection by pressing the ‘PROG’ button.
•
Use the scroller to set the offset, and confirm your setting by pressing
the ‘PROG’ button. The heating control then returns to the normal
operating mode.
You may have to repeat this process several times until the heating power
has been optimally distributed.
10. Replacing the batteries
10.1.
FHT 80b
Wall Thermostat (heating control)
If the ‘
50
14. Replacing the batteries
a) ‘FHT80B’ heating control
If the ‘ ’ symbol appears on the LCD, this means that the batteries are low and must be
replaced.
To replace the batteries, proceed as follows:
• Remove the heating control from the wall holder and open the battery compartment cover
(slide down).
• Remove the batteries from the battery compartment and dispose of them according to the
applicable environmental regulations. See section 18, page 58.
• Insert two new AA batteries; make sure the polarity is correct. If possible, use alkaline
batteries.
• Close the battery compartment.
• If a ‘FHZ1000’ central unit is present, the heating control automatically requests the current
time and date and then sets these. Otherwise you need to set these manually.
The time program settings, the comfort/lowering temperature settings and so on are
maintained.
• As the heating control and the valve operating mechanism are no longer synchronised with each
other, the heating control performs a synchronisation procedure (‘SYnC Auto’) that lasts approx.
2 minutes. After this synchronisation the heating control returns to the normal operating mode.
b) ‘FHT8V’ valve operating mechanism
The battery symbol appears when the valve operating mechanism’s batteries are low. In
addition, an acoustic signal is generated every 2 minutes for one hour, three times a day.
To replace the batteries, proceed as follows:
• Remove the battery compartment cover from the valve operating mechanism by sliding it
down.
• Remove the old batteries and dispose of them according to the applicable environmental
regulations. See section 18.
• Wait until all the segments of the valve operating mechanism’s LCD have gone out. You can
speed up this process by keeping the button on the valve operating mechanism pressed.
’ symbol appears on the LCD, this means that the batteries are low
and must be replaced.
To replace the batteries, proceed as follows:
•
Remove the heating control from the wall holder and open the battery
compartment cover (slide down).
•
Remove the batteries from the battery compartment and dispose of
them according to the applicable environmental regulations. See
section 16, page 39.
•
Insert two new AA batteries; make sure the polarity is correct. If
possible, use alkaline batteries.
•
Close the battery compartment.
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