Installation Instructions

24
Filling the heating system
!
Please note
Unsuitable fill water increases
the level of deposits and corro-
sion and may lead to boiler dam-
age.
■ Thoroughly flush the entire
heating system prior to filling it.
■ Only use fill water of potable
quality.
■ Soften fill water harder than
300 ppm.
■ An antifreeze additive suitable
for heating systems can be
added to the fill water.
1. Close the gas shut-off valve.
2. Switch ON the power supply.
rr
3. Turn rotary selector "rt" anti-clock-
wise for less than 2 s and then clock-
wise back into the control range.
"SERV", "
r
" and "
w
" will appear
on the display. Filling has been acti-
vated.
This function will end automatically
after 20 min or after the ON/OFF
switch has been turned off.
Commissioning, inspection, maintenance
Further details regarding the individual steps
5609 059 GB