Outside Temperature Sensor; External Demand Via Switching Contact; External Demand Via 0; Input - Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors

Electrical connections

Outside temperature sensor

For fitting the wireless outside temperature sensor
(wireless accessory):
Wireless base station installation and service
instructions
Fitting location for outside temperature sensor
■ North or north-western wall, 2 to 2.5 m above ground
level; in multi storey buildings, in the upper half of the
second floor
■ Not above windows, doors or vents

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 coding address "9b" in group "General"/1.
The boiler water temperature is limited by this set
value and by the electronic maximum limit (coding
address "06" in group "Boiler"/2).
Plug
lH
A
1 L
N
?
lH
Floating contact (when connected, remove jumper
A
between L and 1)
Codes
"4b:1" in group "General"/1
■
Effect of the function on the relevant heating circuit
■
pump:
coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
Effect of the function on the circulation pump for cylin-
■
der heating:
coding address "5F" in group "DHW"/3

External demand via 0

Connection at 0 10 V input at EA1 extension.
–
(cont.)
!
10 V input
–
Not immediately below balconies or gutters
■
■ Never render over
Outside temperature sensor connection
2-core lead, length max. 35 m with a cross-section of
2
1.5 mm
!
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
Codes
Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in
■
group "General"/1
Effect of the function on the relevant heating circuit
■
pump:
coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
Effect of the function on the circulation pump for cylin-
■
der heating:
coding address "5F" in group "DHW"/3
Installation sequence
B
[{D
DE
15