Viessmann VITOCAL 300, Installation And Service Instructions Manual

Page: 123 / 160

This setting defines the "value" (inte-
gral comprising the duration and level
of a deviation from the set flow tem-
perature) after which the external heat
source starts. The external heat
source does not start to operate if
short-term temperature deviations
occur.
A
Set flow temperature
B
Actual flow temperature
C
Hysteresis
D
"Value" (integral)
Access
& " System settings "
& " Program "
& " Ext. heat source "
& "Threshold ext. heat source"
(
P
/
Q
)
Standard setting 300
Setting range 10 to 3000
Delay, external heat source
This setting defines the period during
which the external heat source is
not
switched ON after changing the oper-
ating mode.
Access
&
" System settings "
&
" Program "
&
" Ext. heat source "
&
"Delay ext. HS" (
P
/
Q
)
Standard setting 0:30 h
Setting range 0:00 to 5:00 h
Threshold, external heat source
123
Control settings, external heat source
55
92
901
GB
Service