Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 93

Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
"Solar" Group
(continued)
Coding in the factory set condition
"Minimum collector temperature"
12:20 Minimum collector temperature
(minimum start temperature for the solar
circuit pump) 68°F (20°C)
"Extended control function"
20:0 No extended control function enabled.
"Start temperature differential for central heating backup"
22:8 Start temperature differential for central
heating backup: 8 K.
(code "20:4" must be set)
"Stop temperature differential for central heating backup"
23:4 Stop temperature differential for central
heating backup: 4 K.
(code "20:4" must be set)
"Start temperature for thermostat function"
24:40 Start temperature for thermostat function
104°F (40°C).
(code "20:5" or "20:6" must be set)
"Stop temperature for thermostat function"
25:50 Stop temperature for thermostat function
122°F (50°C).
(code "20:5" or "20:6" must be set)
Coding 2 Vitotronic 300-K
Possible change
12:0 No minimum limit enabled
12:1 Minimum collector temperature adjustable
to from 34 to 194°F (1 to 90°C).
12:90
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 storage tanks.
22:2 Start temperature differential adjustable from
to 2 to 30 K.
22:30
23:2 Stop temperature differential adjustable from
to 1 to 29 K.
23:30
24:0 Start temperature for thermostat function
to is adjustable from 0 to 100 K.
24:100
25:0 Stop temperature for thermostat function
to is adjustable from 0 to 100 K.
25:100
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