49
Coding in the delivered condition Possible change
87: Never adjust.
88:0 Temperature displayed in °C (Cel-
sius)
88:1 Temperature displayed in °F (Fah-
renheit)
8A:175 Never adjust
8F:0 All controls active
Note
The relevant code is only activated
when you exit the service menu.
8F:1 All controls disabled
Operation blocked in standard menu
and in extended menu, emissions
test mode can be activated.
8F:2 Only standard settings can be con-
trolled. Operation enabled in stand-
ard menu but blocked in extended
menu, emissions test mode can be
activated.
90:128 Time constant for calculating ad-
justed outside temperature 21.3 h
(only for weather-compensated
control units)
90:1
to
90:199
Subject to the set value, the flow
temperature is adjusted quickly (low-
er values) or slowly (higher values)
when the outside temperature
changes.
1 step ≙ 10 min
94:0 Never adjust.
95:0 Never adjust.
97:0 With LON communication module:
The outside temperature of the
sensor connected to the control
unit is used internally.
97:1 Control unit receives outside tem-
perature.
97:2 The control unit transmits the out-
side temperature to the LON sub-
scribers.
98:1 Viessmann system number (in
conjunction with monitoring of sev-
eral systems via Vitocom 300)
98:1
to
98:5
System no. adjustable from 1 to 5
99:0 Never adjust.
9A:0 Never adjust.
9B:70 Set flow temperature for external
demand 70 °C
9B:0
to
9B:127
Set flow temperature for external de-
mand adjustable from 0 to 127 °C
(limited by boiler-specific parame-
ters)
9C:20 Monitoring LON subscribers.
If there is no response from a sub-
scriber for 20 min, the values
specified in the control unit are
used. Only then will a fault mes-
sage be issued.
9C:0 No monitoring
9C:5
to
9C:60
Time adjustable from 5 to 60 min
9F:8 Differential temperature 8 K, only
in conjunction with heating circuit
with mixer
9F:0
to
9F:40
Differential temperature adjustable
from 0 to 40 K
Code 2
General/Group "1" (cont.)
5839829
Codes
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