Viessmann Vitocrossal 300 Service Instructions For Contractors page 38

Commissioning, inspection, maintenance
Further details regarding the individual steps
Demands for the auxiliary function are
met by circulation pump wR.
Suppression of reheating of the DHW
cylinder by the boiler in conjunction
with solar control module (type SM1)
Reheating suppression takes place in
two stages.
Reheating DHW cylinder qR by boiler
1 is suppressed as soon as DHW cyl-
inder qR is heated by collectors wP. For
this, the set cylinder temperature for
reheating is reduced by boiler 1. Sup-
pression remains active for a certain time
after solar circuit pump wE has been
switched off.
Function/system components
Operation with LPG
System with only one heating circuit with mixer (with-
out unregulated heating circuit)
38
(cont.)
In the case of uninterrupted heating by
collectors wP (> 2 h) boiler 1 will only
reheat, if the set cylinder temperature
(coding address "67") selected at boiler
circuit control unit 2 is not achieved.
In control unit 2, coding address "67"
defaults a third set DHW temperature
(setting range 10 to 95 °C). This value
must be below the first set DHW temper-
ature.
DHW cylinder qR will only be heated by
boiler 1 when this set value is no longer
achieved by the solar thermal system.
Adjust Delivered con-
Code
dition
82:1 82:0
00:4 00:6
00:3 00:5