Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 106

Codes
Coding level 2
(cont.)
Coding in the delivered condition
A4:0 With frost protection
A5:5 With heating circuit pump logic
function (economy control): Heat-
ing circuit pump "OFF" when the
outside temperature (OT) is 1 K
higher than the set room tempera-
ture (RT
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 Only for heating circuit with mixer:
Without mixer economy function
A8:1 Heating circuit with mixer creates a
demand on internal circulation
pump.
106
)
set
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
A4:1 No frost protection; this setting is on-
ly possible if code "A3:
set.
!
A5:0 Without heating circuit pump logic
function
A5:1 With heating circuit pump logic func-
to tion: heating circuit pump "OFF"; see
A5:15 following table
Possible change
A6:5 Extended economy mode enabled:
to The burner and heating circuit pump
A6:35 will stop at a variable value, adjusta-
ble between 5 and 35 °C plus 1 °C.
Mixer is being closed. Basis for this
is the adjusted outside temperature.
This is composed of the actual out-
side temperature and a time con-
stant 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 trying 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 does not
create a demand on internal circula-
tion pump.
9" has been
–
Please note
"Important": Observe for cod-
ing address "A3".