Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 32

Preparing for installation
Preparing for installation
Required codes
Group
"Source type"
"System scheme"
"HC1"
"HC2"
"HC3"
"Relay output QX2"
"Sensor input BX6"
"Function input EX2" "5982:Auxiliary
Preparations for boiler installation
Danger
The product contains ceramic
fibres. If handled incorrectly, fibre
dust may be released.
Observe the stipulations of the
Technical Guidelines for the Han-
dling of Hazardous Materials
(TRGS) 521 [or local regula-
tions].
32
(cont.)
Code
"3750:Solid fuel boil-
er"
"5700:4"
"5710:On"
"5715:On"
"5721:On"
"5891:DHW ctrl elem
Q3"
"5935:Buffer sensor
B42"
burner block"
Function
Solid fuel boiler (only for display
purposes)
System scheme 4 as standard
function
Heating circuit 1 installed
Heating circuit 2 installed
Heating circuit 3 installed
DHW control element Q3, for lifting
the block on the auxiliary burner for
DHW heating
Buffer cylinder sensor B42 fitted
Block on auxiliary burner during
changeover to solid fuel mode
!
Please note
To prevent equipment damage,
install all pipework free of load
and torque stresses.