Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 58

Codes
Coding level 2
(cont.)
Coding in the delivered condition
A5:5 With heating circuit pump logic
function (economy control): Heat-
ing circuit pump "OFF" if outside
temperature (OT) is 1 K higher
than the set room temperature
(RT
set
OT
>
Parameter address A5:...
1
2
3
4
5
6
7
to
15
Coding in the delivered condition
A6:36 Extended economy mode disa-
bled
A7:0 Without mixer economy function
(only for heating circuits with mix-
er)
A8:1 Heating circuit with mixer creates a
demand for the internal circulation
pump (only for systems without low
loss header)
A9:7 With pump idle time: heating circuit
pump "OFF" if set value is modi-
fied by changing the operating
mode or changing the set room
temperature
58
)
RT + 1 K
set
With heating circuit pump logic function: heating circuit pump "OFF"
OT RT + 5 K
>
set
OT RT + 4 K
>
set
OT RT + 3 K
>
set
OT RT + 2 K
>
set
OT RT + 1 K
>
set
OT RT
>
set
OT RT - 1 K
>
set
OT RT - 9 K
>
set
Possible change
Note
"Important": Observe for code "A3"
A5:0 Without heating circuit pump logic
function
A5:1 With heating circuit pump logic func-
to tion: heating circuit pump "OFF"
A5:15 (see the following table)
Possible change
A6:5 Extended economy mode enabled,
to i.e. the burner and heating circuit
A6:35 pump are switched off at a variable
value, adjustable from 5 to 35 °C
plus 1 °C. Mixer is being closed. The
basis for this is the adjusted outside
temperature. This is composed of
the actual outside temperature and a
time constant that takes account of
the way an average building cools
down.
A7:1 With mixer economy function (exten-
ded heating circuit pump logic):
Heating circuit pump also "OFF":
If the mixer has been attempting to
■
close for longer than 20 min.
Heating circuit pump "ON":
If the mixer changes to control
■
function
If there is a risk of frost
■
A8:0 Heating circuit with mixer creates no
demand for internal circulation pump
A9:0 Without pump idle time
A9:1 With pump idle time, adjustable from
to 1 to 15. The higher the value, the
A9:15 longer the pump idle time.