A Min. Temperature Coolant Buffer Cylinder - Viessmann VITOTRONIC 200 Service Instructions Manual

7223 Stop hysteresis coolant buffer cylinder
B
D
Fig. 62
"Start hysteresis coolant buffer cylinder 722B"
A
Set buffer temperature
B
"Stop hysteresis coolant buffer cylinder 7223"
C
Cooling of heating water/coolant buffer cylinder
D
ON
Cooling of heating water/coolant buffer cylinder
E
OFF

722A Min. temperature coolant buffer cylinder

Only for system with heating water/coolant buffer cylin-
der ("Enable buffer cylinder/low loss header 7200"
set to "2"):
This parameter has both of the following functions:
Stop temperature for cooling of the heating water/
coolant buffer cylinder
If the buffer temperature drops below the set value by
1 K, the heating water/coolant buffer cylinder is no lon-
ger cooled. The frost protection function is active.
Lower limit for set buffer temperature
The set buffer temperature for room cooling is the low-
est set flow temperature of all connected heating/cool-
ing circuits or is specified by the "Temp in op. status.
Fixed value for coolant buff cyl. 7220".
722B Start hysteresis coolant buffer cylinder
Only for system with heating water/coolant buffer cylin-
der ("Enable buffer cylinder/low loss header 7200"
set to "2"):
The set value determines the deviation from the set
buffer temperature at which cooling of the heating
water/coolant buffer cylinder is switched on (subject to
the operating status).
A
C
t
Parameter group Buffer cylinder
...
!
(cont.)
≙
Setting 1 0.1 K
/
!
The set value is the lower limit for the set buffer tem-
perature.
Note
If the value set here is above "Min. flow temperature
cooling 2033", the system may not be able to supply
a connected heating/cooling circuit with the calculated
flow temperature during times of high cooling demand.
≙
Setting 1 0.1 °C
/
!
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