Installation
35
Connections to terminal
aBÖ
(VD2/VD2A/CT3 only)
A
Jumper
B
External shut-off (dry contact)
External shut-off
1.
Remove jumper between
terminals 16 and 17.
2.
Connect dry contact.
Controlled switch-off takes
place when the contact is
opened.
Emergency operation
Move jumper from terminals 16
and 17 to terminals 17 and 18.
5285
941
-
0
1
The terminals should be used for
safety switch-off purposes only
(e.g. through a high limit thermostat).
Start at page 52 for details of
controlled switch-off.
During switch-off, there is no frost
protection of the heating system
and the boiler is not kept at the
minimum boiler water temperature.
WARNING
