External Burner Blocking - Viessmann Vitotronic 100 Installation And Service Instructions Manual

External H5 extension
ON ON
STB N STB TR TR
A
150
Fig. 40
Jumper "STB" "STB"
A –
Jumper "TR" "ON/TR"
B –

External burner blocking

C
(floating contact)
External burner blocking
1. Remove jumper "TR"
2. Connect the floating contact.
Opening this contact leads to a controlled burner
shutdown.
External safety equipment
1. Remove jumper "STB"
Temporary operation (burner stage 1)
Insert jumper "TR" "ON/TR" across "TR"
–
(cont.)
C
D P
B
E
P
"ON/TR".
–
"STB".
–
"ON".
–
Minimum pressure limiter
D
Other external safety equipment
E
!
Please note
Connecting external control units can damage
the boiler.
Connect only safety shutdown equipment, e.g. a
temperature limiter, to these terminals.
There is no frost protection for the heating
system while the burner is switched off. The
boiler is not maintained at the lower boiler water
temperature.
2. Connect the external safety equipment in series.
The burner is heated up in stage 1. Shutdown takes
place via the temperature controller.
Function description
67