12
2.
Limit the lower cylinder temperature controller to at
least 5
º
C below the setting of the upper cylinder
temperature controller.
Example:
Heating temperature 60
º
C, upper cylinder tempera-
ture controller 55
º
C, maximum setting of the lower
cylinder temperature controller 50
º
C.
Note
Trouble-free operation of the cylinder loading system
cannot be guaranteed:
■
If both cylinder temperature controllers are set to the
same temperature.
■
If the differential between the heating temperature
and the selected start and stop temperature of the
cylinder temperature controller is too small.
Vitotrans 222 for modulating flow temperatures
The cylinder loading system can be controlled by the
following control units:
■
Vitotronic 100
■
Vitotronic 200
■
Vitotronic 300
■
Vitotronic 300-K
If these control units are not available or if there are
several cylinder loading systems, control can also be
achieved via the Vitotronic 200-H.
Vitotronic installation and service instructions
1.
Set the system-specific code on the Vitotronic. For
this, carry out the following settings in code 2:
Group
Code
Function
"General"
"4C:1"
Primary pump, cylinder loading system
"General"
"4E:2"
Connection on plug
gS
A1
"DHW"
"55:3"
Cylinder temperature controller, cylinder loading system
In addition for the Vitotrans 222 with 240 kW:
"DHW"
"6A:113"
Set runtime 113 s.
2.
Set the cylinder temperature (DHW temperature) on
the Vitotronic.
Vitotronic operating instructions
Shutting down the system
Switch OFF mains power and safeguard against unau-
thorised reconnection.
Checking the function of the safety valve
Inspection and maintenance of the cylinder loading system
DIN 1988 requires a visual inspection and (if neces-
sary) cleaning no later than two years after the cylinder
has been commissioned, and thereafter according to
requirements.
The Vitotrans 222 itself is maintenance-free.
Regularly maintain the following components of the
cylinder loading system (if installed):
■
Loading cylinder
■
Water treatment equipment in the cold water supply:
Sluices or injection systems in the cold water supply
should be refilled in good time and the equipment
should be maintained.
Commissioning, inspection, maintenance
Setting the cylinder temperature
(cont.)
5549 892 GB
