Installation
38
Connection of external equipment to terminal
a
VD
External changeover of the heating
program/”Open mixing valves”
Connect floating contact to terminals
”1” and ”2”.
The manually preselected heating
program can be changed over (see
table) and the mixing valves opened
via the contact.
Via coding address ”9A” the function
”Open mixing valves” and via coding
address ”91” the changeover of the
heating program can be assigned to
the heating circuits.
External disable/”Close mixing valves”
Connect floating contact to terminals
”2” and ”3”.
Controlled switch-off of the burner
takes place or the mixing valves are
closed when the floating contact is
closed.
The shunt pump is switched off.
Please note:
During controlled switch-off or
”Close mixing valves”, there is no
frost protection of the boiler or
heating circuits and no minimum
boiler water temperature is
maintained.
Coding address ”99” can be used to
select the equipment for which the
input
aVD
is to be effective.
Manually preselected heating program
(with contact open)
Coding 2
Heating program after changeover
(with contact closed)
9
or
Space heating OFF/DHW OFF
d5: 0
(factory default)
<–>
Continuous operation with reduced room
temperature/DHW OFF
w
or
Space heating ON/DHW ON
d5: 1
<–>
Continuous operation with normal room
temperature/DHW according to coding
address ”64”
rw
Space heating ON/DHW ON
5285
941
-
0
1
A
External changeover of the heating program/
”Open mixing valves” externally (floating contact)
B
External disable/”Close mixing valves” externally
(floating contact)
143
B
A
