Service/Special Operation (Service Functions) - Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors

Input/output test
Function
"Sensor temp BX6" (B42/
B10)
"Sensor temp BX7"
(temperature inside the appli-
ance)
"Sensor temp BX21"
Heating circuit 1 flow tempera-
ture
"Sensor temp BX21"
Heating circuit 2 flow tempera-
ture
"Sensor temp BX21"
Heating circuit 3 flow tempera-
ture
"Voltage signal H3"
"Contact state H3"
"Frequency H3"
"Contact state H4"
"Pulse counter H4"
"Frequency H4"
"Signal input EX1"
"Signal input EX2"

Service/special operation (service functions)

Function
"Maintenance interval"
A service message is generated
after expiry of the period set here
(fault message 105)
"Time since maintenance"
■ Counts the time elapsed since
the last service
■ Can be reset to "0"
"Chimney sweep function"
(see page 160)
(cont.)
Code From/
switching
state
7825 0.0
7826 0.0
7830 - 28.0
7832 - 28.0
7834 - 28.0
7854 0
7855 "Open"
7857 0
7860 "Open"
7861 0
7862 0
7911 0
7912 0
Code
7044
7045
7130
To/switching
state
200.0
200.0
350.0
350.0
350.0
10
"Closed"
1000
"Closed"
65535
1000
230
230
Operating Setting options
level
"F2" 1 to 240 months (deliv-
ered condition: 12
months)
"F2" 0 to 240 months
"E" ■ "Off"
■ "On"
Service scans
Unit
°C
°C
°C
°C
°C
V
Hz
Hz
V
V
115