Viessmann VITODENS 222-F Installation And Service Instructions Manual page 79

General/group "1"
Coding in the delivered condition
3E:0 Internal circulation pump
stays in control mode at
signal "External block-
ing"
3F:0 Internal circulation pump
stays in control mode at
signal "External
demand"
51:0 System with low loss
header:
Internal circulation pump
always starts when there
is a heat demand
52:0 Without flow temperature
sensor for low loss
header
54:0 Without solar thermal
system
6E:50 Never adjust
76:0 Without LON communi-
cation module (only for
weather-compensated
control units)
77:1 LON subscriber number
(only for weather-com-
pensated control units)
(cont.)
Possible change
3E:1
3E:2
3F:1
3F:2
51:1
51:2
52:1
76:1
77:2
to
77:99
Code 2
Internal circulation pump
stops at signal "External
blocking"
Internal circulation pump
starts at signal "External
blocking"
Internal circulation pump
stops at signal "External
demand"
Internal circulation pump
starts at signal "External
demand"
System with low loss
header:
When there is a heat
demand, the internal circu-
lation pump is only started
if the burner is operational.
System with heating water
buffer cylinder:
When there is a heat
demand, the internal circu-
lation pump is only started
if the burner is operational.
With flow temperature sen-
sor for low loss header
(automatic recognition)
With LON communication
module (automatic recog-
nition)
LON subscriber number,
adjustable from 1 to 99:
1 - 4 = Boiler
5 = Cascade
10 - 98 = Vitotronic 200-H
99 = Vitocom
79