Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group - Viessmann Vitotronic 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B Installation and Service
"Solar" Group
(continued)
Only in conjunction with solar control module, type SM1.
Coding in the delivered condition
Extended solar control functions
20:0 No extended control function enabled.

"Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group

Coding in the delivered condition
Priority DHW heating
A2:2 DHW tank priority for heating circuit pump and
mixing valve.
Economy function outside temperature
A5:5 With heating circuit pump logic function
(economy mode): heating circuit pump "OFF"
when the outside temperature (AT) is 1 K
higher than the set room temperature (RTset)
AT > RTset + 1 K
Parameter address
A5:...
1
2
3
4
5
6
7
to
15
With heating circuit pump logic function: Heating circuit pump "OFF"
AT > RTset + 5 K
AT > RTset + 4 K
AT > RTset + 3 K
AT > RTset + 2 K
AT > RTset + 1 K
AT > RTset
AT > RTset – 1 K
AT > RTset – 9 K
Possible change
20:1 Additional function for DHW heating.
20:2 Differential temperature control 2.
20:3 Differential temperature control 2 and auxiliary
function.
20:4 Differential temperature control 2 for central
heating backup.
20:5 Thermostat function.
20:6 Thermostat function and auxiliary function.
20:7 Solar heating via external heat exchanger without
additional temperature sensor.
20:8 Solar heating via external heat exchanger with
additional temperature sensor.
20:9 Solar heating of two DHW tanks.
Possible change
A2:0 Without DHW tank priority applicable
to heating circuit pump and mixing valve.
A2:1 DHW tank priority applies only to mixing valves.
A2:3 Modulating priority applies to mixing valves,
to i.e. the heating circuit receives a reduced
A2:15 amount of heat.
A5:0 Without heating circuit pump logic function.
A5:1 With heating circuit pump logic function: Heating
to circuit pump "OFF"; see the following table.
A5:15
Code 1
59