Viessmann Vitoligno 300-P Service Instructions For Contractors page 64

Codes
Code 2
(cont.)
Coding in the delivered condition
9F:8 Differential between set
flow temperature and set
boiler water temperature
8 K
A0:0 Without remote control
A2:2 With cylinder priority
applied to heating circuit
pump and mixer
A3:2 Outside temperature
below 1 °C: Heating cir-
cuit pump "ON"
Outside temperature
above 3 °C: Heating cir-
cuit pump "OFF"
!
Please note
When selecting a value below 1 °C, there is a risk of pipes outside the thermal
envelope of the building being damaged by frost.
The standby mode, in particular, should be taken into consideration, e.g. dur-
ing holidays.
64
Possible change
9F:0 Differential temperature
to adjustable from 0 to 40
9F:40
A0:1 With Vitotrol 200;
will be recognised auto-
matically
A0:2 With Vitotrol 300;
will be recognised auto-
matically
A2:0 Without cylinder priority
applicable to heating circuit
pump and mixer
A2:1 With cylinder priority
applied to mixer (select for
systems with heating water
buffer cylinder)
The mixer is closed whilst
DHW is heated; the heating
circuit pump operates
A2:3 Modulating priority applied
to to mixer (select for system
A2:15 without heating water buf-
fer cylinder); i.e. the heat-
ing circuit receives a
reduced amount of heat
Heating circuit pump
A3:−9
"On"/"Off"; see the follow-
to
ing table
A3:15