Input/Output Test - Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors

Service scans
Relay test
(cont.)
Function Code
"Relay 7700
test"

Input/output test

The displayed value shows a captured
temperature or a switching state, for
example. If "- - -" is displayed, either
there is no component connected or the
connection is faulty.
Function
"Outside temp B9"
"Boiler temp B2"
"Boiler temp B20"
"Head control temp B24"
"Head limit temp B25"
"Return temp B7"
"Sensor temp BX3" (B3)
"Sensor temp BX4" (B4)
"Sensor temp BX5" (B41)
114
Oper- Setting/function
ating
level
"F2" "No test"
"Everything off"
"Relay output QX1" (central fault message facili-
ty)
"Relay output QX2"
"Relay output QX3" (diverter valve)
"Relay output QX4"
"Relay output QX21" mixer extension 1
"Relay output QX22" mixer extension 1
"Relay output QX23" mixer extension 1
"Relay output QX21" mixer extension 2
"Relay output QX22" mixer extension 2
"Relay output QX23" mixer extension 2
"Relay output QX21" mixer extension 3
"Relay output QX22" mixer extension 3
"Relay output QX23" mixer extension 3
Code
7730
7760
7761
7764
7765
7769
7822
7823
7824
Operating level "F2".
From/ To/switching
switching state
state
- 50.0 50.0
0.0 140.0
0.0 140.0
0.0 700.0
0.0 700.0
0.0 140.0
0.0 200.0
0.0 200.0
0.0 200.0
Unit
°C
°C
°C
°C
°C
°C
°C
°C
°C