65
11. Replacing the batteries
a) Control centre:
If the ‘ ’ symbol appears on the display, the battery is low.
Open the battery compartment (turn the battery compartment cover in the direction of the arrow) and replace the 9V block
battery with a new one.
Make sure that the polarity is correct when inserting the battery.
You will find a corresponding figure in the battery compartment.
Then close the battery compartment.
Ö
After the short display test the date, time and so on should be set according to section 5. a) item 2.
b) Valve operating mechanism
If a low battery symbol appears on the display, then the valve operating mechanism’s batteries are low. The valve operating
mechanism also generates a tone sequence approx. every 2 minutes for one hour. This is repeated three times a day.
• Open the battery compartment cover of the valve operating mechanism by sliding it down and out.
• Remove the empty batteries. Wait until all segments of the display are off. You can speed this up by keeping the button
on the valve operating mechanism pressed.
• Insert two new AA batteries (preferably alkaline) in the battery compartment, observing the correct polarity. You will find
corresponding figures in the battery compartment.
• ‘C1’ is displayed, followed by a two-digit number. ‘C2’ is then displayed, followed by another two-digit number.
These two numbers are the two parts of the security code (for example, ‘12’ and ‘34’ = security code ‘1234’).
• Afterwards a signal tone sounds and the display shows ‘A1’.
• The valve operating mechanism now fully retracts the control pin.
• Afterwards the display shows ‘A2’.
• Briefly press the button on the valve operating mechanism once.
• The display shows ‘A3’ and the operating mechanism closes the valve fully.
• The antenna symbol then blinks on the display, and ‘0%’ also appears.
• The first radio signal that is received is acknowledged by a signal tone, and the antenna symbol is permanently displayed.
• Replace the valve operating mechanism’s battery compartment cover.
FHT 8W Heat Demand Relay
Installation and User Guide
Product Code EHC-FH06
1