Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 164

Coding Level 2
"Solar" Group
Coding in the factory set condition
"Extended control function"
20:0 No extended control function enabled.
"Start temperature differential for central heating backup"
22:8 Start temperature differential with central
heating backup 14°F (8 K)
(code "20:4" must be set).
"Stop temperature differential for central heating backup"
23:4 Stop temperature differential with central
heating backup 7°F (4 K)
(code "20:4" must be set).
"Start temperature for thermostat function"
24:40 Start temperature for thermostat function
104°F (40°C) (coding "20:5"or "20:6"
must be set).
"Stop temperature for thermostat function"
25:50 Stop temperature for thermostat function
122°F (50°C) (coding "20:5"or "20:6"
must be set).
"Priority for DHW storage tank 1"
26:1 Priority for DHW storage tank 1
with cyclical heating (code "20:9"
must be set).
164
(continued)
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
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 storage tanks
[Solar heating of two DHW tanks].
22:2 Start temperature differential
to adjustable from 4°F to 54°F
22:30 (2 K to 30 K).
23:2 Stop temperature differential
to adjustable from 2°F to 52°F
23:30 (1 to 29 K).
24:0 Adjustable from 0°F to 180°F (0 K to
to 100 K).
24:100
25:0 Adjustable from 0°F to 180°F
to (0 K to 100 K).
25:100
26:0 Priority for DHW storage tank 1
without cyclical heating.
26:2 Priority for DHW storage tank 2
without cyclical heating.
26:3 Priority for DHW storage tank 2
with cyclical heating.
26:4 Alternate heating without priority
for one of the DHW storage tanks .