Viessmann FB2B Installation And Service Instructions Manual page 81

General
(cont.)
Coding in the delivered condition
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
54:3 Do not adjust
6E:50 Do not 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)
Possible change
3F:1 Internal circulation pump
stops at signal "External
demand"
3F:2 Internal circulation pump
starts at signal "External
demand"
51:1 System with low loss
header:
When there is a heat
demand, the internal circu-
lation pump will only be
started when the burner is
operational.
51:2 System with heating water
buffer cylinder:
When there is a heat
demand, the internal circu-
lation pump will only be
started when the burner is
operational.
52:1 With flow temperature sen-
sor for low loss header
(automatic recognition)
76:1 With LON communication
module (automatic recog-
nition)
77:2 LON subscriber number,
to adjustable from 1 to 99:
77:99 1 - 4 = Boiler
5 = Cascade
10 - 98 = Vitotronic 200-H
99 = Vitocom
Note
Allocate each number only
once.
Code 2
81