External Demand Via Switching Contact; External Demand Via 0; Input - Viessmann VITODENS 200-W B2HA Installation And Service Instructions Manual

Electrical connections

External demand via switching contact

Connection options:
EA1 extension (accessory, see separate installation
■
instructions)
■ Plug
lH
When the contact is closed, burner operation is load-
dependent. The boiler water is heated to the set value
selected in parameter/coding address "9b" in the
"General"/1 group. The boiler water temperature is
limited by this set value and by the electronic maxi-
mum limit (coding address "06" in the "Boiler"/2
group).
Plug
lH
A
1 L N
?
lH
Floating contact (when connecting, remove jumper
A
between L and 1)
Parameters/codes
"4b:1" in the "General"/1 group
■
Effect of the function on the relevant heating circuit
■
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Parameter/coding address "5F" in the "DHW"/3
group

External demand via 0

Connection at 0 10 V input at EA1 extension.
–
Ensure DC separation between the earth conductor
and the negative pole of the on-site power source.
(cont.)
10 V input
–
!
Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be floating and
meet the requirements of protection class II.
EA1 extension
[{A [{S
DE DE
A
Floating contact
A
EA1 extension
B
Parameters/codes
Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in the
■
"General"/1 group
Effect of the function on the relevant heating circuit
■
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Parameter/coding address "5F" in the "DHW"/3
group
Installation sequence
B
[{D
DE
23