Viessmann VITODENS 242-F Installation And Service Instructions Manual page 87

"General"
(cont.)
Coding in the delivered condition
Internal circulation pump function
51:0 Internal circulation pump
always starts when there
is a heat demand
Subscriber no.
77:1 LON subscriber number
Detached house/apartment building
7F:1 Detached house
Possible change
51:1 System with low loss head-
er:
When there is a heat de-
mand, the internal circula-
tion pump is only started if
the burner is operational.
Circulation pump is switch-
ed off on expiry of run-on
time.
51:2 System with heating water
buffer cylinder:
When there is a heat de-
mand, the internal circula-
tion pump is only started if
the burner is operational.
Circulation pump is switch-
ed off on expiry of run-on
time.
77:2 LON subscriber number,
to adjustable from 1 to 99:
77:99 1 - 4 = Boiler
5 = Cascade
10 - 97 = Vitotronic 200-H
98 = Vitogate
99 = Vitocom
7F:0 Apartment building
Holiday program and time
program for DHW heating
can be set separately
Code 1
87