Viessmann VITODENS 242-F Installation And Service Instructions Manual page 101

"General"
(cont.)
Coding in the delivered condition
3d:5 DHW circulation pump
runtime for brief opera-
tion: 5 min
3E:0 At signal "External block-
ing" internal circulation
pump stays in control
mode
3F:0 At signal "External de-
mand" internal circulation
pump stays in control
mode
Function input lH: No
4b:0
function
51:0 Internal circulation pump
always starts when there
is a heat demand
52:0 Without flow temperature
sensor for low loss head-
er
Possible change
DHW circulation pump run-
time adjustment: Coding
address "3d" in this group
3d:1 DHW circulation pump run-
to time adjustable from 1 to
3d:60 60 min
3E:1 At signal "External block-
ing" internal circulation
pump stops
3E:2 At signal "External block-
ing" internal circulation
pump starts
3F:1 At signal "External de-
mand" internal circulation
pump stops
3F:2 At signal "External de-
mand" internal circulation
pump starts
4b:1 External demand
4b:2 External blocking
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.
52:1 With flow temperature sen-
sor for low loss header (au-
tomatic recognition)
Code 2
101