Adjusting Screed Drying - Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors

Further details regarding the individual steps
Function (code)
"Heating curve slope" A (incli-
nation)
"Heating curve displacement"
B (level)
"Heating curve adaption" (Auto-
matic adjustment)

Adjusting screed drying

This function allows screeds to dry dur-
ing the construction phase. For this,
always observe the details specified by
the screed manufacturer.
When the screed drying function is acti-
vated, the heating circuit pump is
switched on and the flow temperature is
held in accordance with the selected pro-
file. On completion (25 days), the heating
circuit is regulated automatically via the
set parameters.
This function comes to an end when the
set time expires or the setting is returned
to "Off".
Note
The screed drying function is only appro-
priate for heating circuits with mixers.
Setting Meaning/effect
"Off" Function disabled
Passes through the first part of temperature profile A
"Functional
heating"
"Curing heat- Passes through the second part of temperature profile B
ing"
Commissioning, inspection, maintenance
Code
Heat- Heat- Heat-
ing ing ing
cir- cir- cir-
cuit 1 cuit 2 cuit 3
720 1020 1320 0.10 - 4.00
721 1021 1321
726 1026 1326
Observe EN 1264.
The report to be provided by the heating
contractor must contain the following
heat-up details:
■ Heat-up data with respective flow tem-
peratures
■ Max. flow temperature achieved
■ Operating conditions and outside tem-
perature during handover
First select the relevant heating circuit to
set screed drying.
"Screed drying" (code 850; 1150;
1450)
(cont.)
Setting Deliv-
range ered con-
dition
1.40
-4.5 - 4.5 0.0
On - Off Off
83