Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 97

Vitotronic 300, GW5B & MW1B Installation and Service
"Solar" Group
(continued)
Coding in the factory set condition
23:4 Stop temperature differential for central heating
backup: 4 K.
Switching output sS is switched off when the
temperature at sensor / falls below the stop
point. The stop point is the sum of the temperature
at sensor aÖ and the value selected for the stop
temperature differential.
24:40 Start temperature for thermostat function 104° F
(40° C).
Start temperature for thermostat function ≤ stop
temperature for thermostat function:
Thermostat function, e.g. for reheating.
Switching output sS is switched on when the
temperature at sensor / falls below the start
temperature for the thermostat function.
Start temperature for thermostat function > stop
temperature for thermostat function:
Thermostat function, e.g. for utilizing excess heat.
Switching output sS is switched on when the
temperature at sensor / exceeds the start
temperature for the thermostat function.
25:50 Stop temperature for thermostat function 122° F
(50° C).
Start temperature for thermostat function ≤ stop
temperature for thermostat function:
Thermostat function e.g. for reheating. Switching
output sS is switched off when the temperature
at sensor / exceeds the start temperature for the
thermostat function.
Start temperature for thermostat function > stop
temperature for thermostat function:
Thermostat function e.g. for utilizing excess heat.
Switching output sS is switched off when the
temperature at sensor / falls below the start
temperature for the thermostat function.
26:1 Priority for DHW tank 1 – with alternate heating.
Only when setting code "20:8"
27:15 Alternate heating time 15 min.
The DHW tank without priority is heated at most
for the duration of the set alternate heating time if
the DHW tank with priority is heated up.
28:3 Alternate pause time 3 min.
After the selected alternate heating time for the
DHW tank without priority has expired, the rise
in collector temperature is captured during the
alternate pause time.
Code 2, Vitotronic 300-K
Possible change
23:2 Stop temperature differential for
to central heating backup is adjustable
23:30 from 1 to 29 K.
24:0 Start temperature for thermostat
to function is adjustable from 0 to 100 K.
24:100
25:0 Start temperature for thermostat
to function is adjustable from 0 to 100 K.
25:100
26:0 Priority for DHW tank 1
– without alternate heating
26:2 Priority for DHW tank 2
– without alternate heating.
26:3 Priority for DHW tank 2
– with alternate heating.
26:4 Alternate heating without priority for
one of the DHW tanks.
27:5 The alternate heating time is adjustable
to from 5 to 60 min.
27:60
28:1 The alternate pause time is adjustable
to from 1 to 60 min.
28:60
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