Stop Hysteresis, Heating Water Buffer Cylinder - Viessmann VITOTRONIC 200 Service Instructions Manual

Parameter group Buffer cylinder

7209 Stop hysteresis, heating water buffer cylinder

If the set buffer temperature is exceeded by the set
hysteresis, heating of the buffer cylinder is terminated.
Which temperature sensor is used for switching off
depends on the active operating status in "Time pro-
gram heating water buffer cylinder".
720A Operating mode, fixed value only for heat demand
The operating status "Fixd value" can be blocked for
the buffer cylinder if there is no heat demand from any
of the connected heating circuits. In such cases, the
buffer cylinder is only heated to the set temperature for
operating status "Standard".
A heat demand from one of the heating circuits is
present in the following cases:
■ A time phase is active in "Time program heating"
or "Time proghtg/cooling".
■ Central heating for frost protection is switched on
(operating status "Standby").
721F Buffer cyl operating mode
Only for system with heating water/coolant buffer cylin-
der ("Enable buffer cylinder/low loss header 7200"
set to "2"):
7220 Temp in op. status. Fixed value for coolant buff cyl.
Only for system with heating water/coolant buffer cylin-
der ("Enable buffer cylinder/low loss header 7200"
set to "2"):
7223 Stop 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 off (subject to
the operating status).
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Setting 1 0.1 K
Value Meaning
"0" Operating status "Fixd value" is switched on
according to "Time prog buffer cyl", regard-
less of whether there is a heat demand from
the heating circuits.
"1" Operating status "Fixd value" is only switch-
ed on if a heat demand for one of the connec-
ted heating circuits is active.
Note
This function is only available for system schemes 1
and 2 if "Enable buffer cylinder/low loss header
7200" is set to "1" or "2".
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Value Meaning
"0" Central heating is enabled.
"1" Central cooling is enabled.
Note
The temperature cannot be set lower than "Min. tem-
perature coolant buffer cylinder 722A".
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Setting 1 0.1 °C
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