Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 118

Service scans
Diagnostics
(cont.)
Function
"State heating circuit
pump Q2"
"State heat circ mix valve
1 open"
"State heat circ mix valve
1 close"
"Room temperature heat-
ing circuit 1" (actual value/
set value)
"Flow temp heating cir-
cuit 1" (actual value/set
value)
"Room thermostat heat-
ing circuit 1"
"State heating circuit
pump Q6"
"Room temperature heat-
ing circuit 2" (actual value/
set value)
"Flow temp heating cir-
cuit 2" (actual value/set
value)
"Room thermostat heat-
ing circuit 2"
"State heating circuit
pump 3"
"State HC mixing valve 3
open"
"State HC mixing valve 3
closed"
"Room temperature heat-
ing circuit 3" (actual value/
set value)
"Flow temperature set
value resulting HC 3"
"Flow temperature actual
value heating circuit 3"
"Room thermostat heat-
ing circuit 3"
118
Code Operat-
ing lev-
el
8730 "F2"
8731 "F2"
8732 "F2"
8740 "F2"
8743 "F2"
8749 "F2"
8760 "F2"
8770 "F2"
8773 "F2"
8779 "F2"
8790 "F2"
8791 "F2"
8792 "F2"
8800 "F2"
8803 "F2"
8804 "F2"
8809 "F2"
From/ To/switching
switch- state
ing state
"Off" "On"
"Off" "On"
"Off" "On"
0.0 50.0
0.0 140.0
"No de- "Demand"
mand"
"Off" "On"
0.0 50.0
0.0 140.0
"No de- "Demand"
mand"
"Off" "On"
"Off" "On"
"Off" "On"
0.0 50.0
0.0 140.0
0.0 140.0
"No de- "Demand"
mand"
Unit
°C
°C
°C
°C
°C
°C
°C