Viessmann VITOTRONIC 050 - Page 44

44
Coding
Coding 2 (cont.)
Coding in the factory default setting Possible change
General (cont.)
A0 : 0 Without remote control A0 : 1 With Vitotrol 200; automatic recognition
A2 : 2 With Viessmann 2-wire BUS communication
m
o
d
u
l
e
:
A2 : 0 Without DHW tank priority
A
2
:
2
W
i
t
h
V
i
e
s
s
m
a
n
n
2
-
w
i
r
e
B
U
S
c
o
m
m
u
n
i
c
a
t
i
o
n
module:
With DHW tank priority applicable to
heating circuit pump and mixing valve
A2 : 1 With DHW priority:
The mixing valve is closed and the heating
circuit pump is ON while the DHW tank is
being heated
A2 : 3
to
A2 : 15
No function
A3 : 2
O
u
t
d
o
o
r
t
e
m
p
e
r
a
t
u
r
e
s
b
e
l
o
w
1
°
C
/
3
4
°
F
.
Heating circuit pump ON
Outdoor temperatures above 3°C / 37°F.
Heating circuit pump OFF
Safety instruction:
At settings below 1°C /
34°F there is a risk that piping outside
the insulation of the building may
freeze, e.g. pipes in the roof space, to
the garage, in radiator alcoves etc.
Pay particular attention to the standby
mode, e.g. during holiday
periods.
A3 : –9
A3 : –8
A3 : –7
A3 : –6
A3 : –5
A3 : –4
A3 : –3
A3 : –2
A3 : –1
A3 : –0
A3 : –1
A3 : –2
to
A3 : 15
Heating circuit pump
See conversion chart at back of manual for °F
ON at OFF at
–10 °C –8 °C
–19 °C –7 °C
–18 °C –6 °C
–17 °C –5 °C
–16 °C –4 °C
–15 °C –3 °C
–14 °C –2 °C
–13 °C –1 °C
–12 °C –0 °C
–11 °C –1 °C
–10 °C –2 °C
–11 °C –3 °C
to
-14 °C 16 °C
A4 : 0 With freeze-up protection A4 : 1 No freeze-up protection.
Adjustable only possible when
coding A3 : –9 is set.
Please note:
Observe the notes for coding
address A3.
A5 : 5 With the heating circuit pump logic function
(economy circuit):
t
h
e
h
e
a
t
i
n
g
c
i
r
c
u
i
t
p
u
m
p
i
s
O
F
F
,
i
f
t
h
e
A5 : 0 Without heating circuit pump logic function
(HPL function)
(
e
c
o
n
o
m
y
c
i
r
c
u
i
t
)
:
the heating circuit pump is OFF, if the
outdoor temperature (OT) is 1 K above the
desired room temperature (RT
set
).
OT > RT
set
+ 1 K
A5 : 1
A5 : 2
A5 : 3
A5 : 4
A5 : 5
A5 : 6
A5 : 7
A5 : 15
With heating circuit pump logic function (HPL
function): The heating circuit pump is switched
off if
OT > RT
set
+ 5 K
OT > RT
set
+ 4 K
OT > RT
set
+ 3 K
OT > RT
set
+ 2 K
OT > RT
set
+ 1 K
OT = RT
set
OT > RT
set
–1 K
OT > RT
set
–9 K
5285 967 v1.2