Installation & Servicing instructions
AT
AG XL
43
9.5 Filling the heating system
When all boilers have been electrically commissioned as described above, then the
heating system can be filled. Each boiler is fitted with a filling and drain valve. The filling
hose from the water tap is then connected to it.
Fill the heating system only with drinking water. Refer to the Water Quality chap
-
ter for quality requirements of the filling water.
Water pressure
Screen display
Good
Read-out
Operation
status
Technical
read-out
Description
Action
FILL
dd 00:00
FILL
Bx12sc03
xx.x°C
P0,0
Water pressure is 0 bar, boiler off
Top up water
FILL
dd 00:00
FILL
Bx12sc03
xx.x°C
P>0,7
Water pressure above 0.7 bar. The boiler
is off. The automatic venting program
starts
Top up water until
approx. 1,7 bar
Block.
dd 00:00
Vent
Prog.
xx.x°C
P>1,2
Automatic venting program, afterwards
(approx. 13 min.) boiler is on standby
Top up water until
approx. 1,7 bar
Good
dd 00:00
(variable)
xx.x°C
P>1,0 <4,0
Water pressure is good. Boiler standby or
in normal operation
None
Block.
dd 00:00
xx.x°C
P>4,0
Water pressure too high, boiler off due to
blocking
Drain water until
approx. 1,7 bar
Good
dd 00:00
(variable)
xx.x°C
P<3,7
Water pressure is good. Boiler operates
normally again
None
Message/
Block.
dd 00:00
FILL
Message
Mx24sc14
xx.x°C
P<1 >0,7
Water pressure too low. Boiler is limited
to 50% load
Top up water until
approx. 1,7 bar
Venting program
When, on filling the system, the water pressure rises above 0.7 bar, the venting program
will start automatically. The program lasts approx. 13 minutes and in doing so, turns
the pump on and off and, if fitted, the three-way valve every 80 seconds to remove the
remaining air from the boiler. All venting points still have to be vented when filling the
installation. The boiler will be on standby after the venting program.
The automatic venting program only vents the boiler and not the rest of the
installation.
Read-out 1 (Good status) displays Block. with actual day and time on the screen.
Read-out 2 (operational status) displays Vent Prog on the screen. [From Good press
the – button 1x: Vent Prog is now displayed]
Interrupting the venting program (not recommended) is only possible from the setting
level by pressing OK during the venting program.
For boiler checks please refer to the chapter Checks prior to commissioning.
For any checks or setting changes, refer to the Basic Settings chapter.
Vent
Prog.
OK
-
+
OK
-
+
FILL
Block.
we 10:17
