Technical data

177
Coding – Vitocontrol-S, VD2/CT3/CM2
Coding 2 (continued)
Coding in factory setting Possible change
System circuit/mixing valve circuit (continued)
A4: 0 With frost protection A4: 1 No frost protection
Adjustment only possible if coding A3: –9 is set.
Please observe note regarding coding
address A3.
A5: 5
With heating circuit pump logic function (economy
c
i
r
c
u
i
t
)
:
A5: 0 Without heating circuit pump logic function
W
i
t
h
h
e
a
t
i
n
g
c
i
r
c
u
i
t
p
u
m
p
l
o
g
i
c
f
u
n
c
t
i
o
n
(
e
c
o
n
o
m
y
circuit):
Heating circuit pump OFF, if outdoor temperature
(AT) is 1 K higher than set room temperature (RT
set
)
AT > RT
set
+ 1 K
A5: 1
A5: 2
A5: 3
A5: 4
A5: 5
A5: 6
A5: 7
to
A5: 15
With heating circuit pump logic function:
Heating circuit pump OFF, if
AT > RT
set
+ 5 K
AT > RT
set
+ 4 K
AT > RT
set
+ 3 K
AT > RT
set
+ 2 K
AT > RT
set
+ 1 K
AT > RT
set
+ 1 K
AT > RT
set
– 1 K
to
AT > RT
set
– 9 K
A6: 36 Extended economy function inactive A6: 5
to
A6: 35
Extended economy function active, i.e. burner and
heating circuit pump will be switched OFF, and
mixing valve will be closed at a variable value
which is adjustable between 5 and 35˚C / 41 and
95˚F plus 1˚C / 2˚F.
This value is based on dampened outdoor
temperature, comprising actual outdoor
temperature and a time constant which takes
cooling down of an average building into
consideration.
A7: 0 Without mixing valve economy function A7: 1 With mixing valve economy function
(extended heating circuit pump logic).
Heating circuit pump also OFF, if mixing valve was
closed longer than 12 minutes.
Heating circuit pump ON:
If mixing valve changes to control mode
or
After DHW tank heating (for 12 minutes)
or
If there is a risk of frost
System circuit/mixing valve circuit
A9: 7
With pump stop function:
H
e
a
t
i
n
g
c
i
r
c
u
i
t
p
u
m
p
O
F
F
d
u
r
i
n
g
s
e
t
-
p
o
i
n
t
v
a
l
u
e
A9: 0 Without pump stop function
W
i
t
h
p
u
m
p
s
t
o
p
f
u
n
c
t
i
o
n
:
Heating circuit pump OFF during set-point value
changes (by changing operating mode or changes
on rotary selector ts or button tm)
A9: 1
to
A9: 15
Pump stop function adjustable from 1 to 15
5351 340 v1.4