Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 118

Additional information
Coding 2
(continued)
Overview of all codings (continued)
Coding as per Function
factory setting
Address:
Value
*1
04:
Boiler/
burner
05: 70 Boiler/
burner
(mod.)
06: 87 Boiler/
burner
*1
The factory setting is determined by the boiler coding card.
118
Switching differential
Burner curve
Max. limit of boiler water
temperature set to 95°C /
203°F
New coding Possible change
Address:
Value
04: 0 Switching differential 4°C / 7°F
ON
OFF
Set-
point
Low
heat demand
Switching differential heat demand-
controlled
ERB50 function
Values from 6 to 12°C / 11 to 22°F are
04: 1
set, depending on the heat demand.
ON
OFF
Set-
point
Low
heat demand
ERB80 function
Values from 6 to 20°C / 11 to 36°F are
set, depending on the heat demand.
04: 2
ON
OFF
Set-
point
Low
heat demand
The heat demand-controlled switching
differential takes into account the boiler
load. The switching differential, i.e. the
burner operating time, is varied in relation
to the actual heat demand.
05: 1 Burner curve not linear:
to
05: 99 Partial output in kW (at g of the
Operating time of the
actuating drive)
Max. output in kW
= Partial output in %
06: 20 Maximum boiler water temperature limit
to variable between 20 and 127°C / 68 and
06: 127 261°F
Time
Medium High
heat demand heat demand
Time
High
Medium
heat demand
heat demand
Time
Medium High
heat demand heat demand
·x 100 %