Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 109

Changing codes
Function
"Relay output QX4"
"Sensor input BX6"
"Function input EX1"
(power demand function
see page 154)
"Cont type input EX1"
■ NC: Contact closed,
must be opened to acti-
vate
■ NO: Contact open, must
be closed to activate
"Function input EX2"
(power demand function
see page 154)
(cont.)
Code Operat-
ing level
5894 "F2"
5935 "F2"
5980 "F2"
5981 "F2"
5982 "F2"
Setting options Delivered
condition
■ "None" "None"
■ "Alarm output
K10" (see
page 55)
■ "Circulating
pump Q4"
■ "Heat request
K27" (see
page 155)
■ "DHW ctrl el-
em Q3"
■ "Suppl source
control K32"
(see page 155)
■ "Common "Buffer sen-
flow sensor sor B42"
B10"
■ "Buffer sensor
B42"
■ "None" "None"
■ "Ext heat dem,
rel Eng Bu"
■ "Auxiliary
burner lock"
■ "NC" "NO"
■ "NO"
■ "None" "None"
■ "Ext heat dem,
rel Eng Bu"
■ "Auxiliary
burner lock"
Codes
109