Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 163

Coding 2
(cont.)
Coding in factory setting
System circuit/mixing valve circuit (cont.)
A5: 5
With heating circuit pump logic function With heating circuit pump logic function
(economy circuit): (economy circuit):
Heating circuit pump OFF, if outdoor temperature
(AT) is 1 K higher than set room temperature
(RT )
set
AT > RT + 1 K
set
A6: 36 Extended economy function inactive
Mixing valve circuit
A7: 0 Without mixing valve economy function
System circuit/mixing valve circuit
A9: 7
With pump stop function: With pump stop function:
Heating circuit pump OFF during set-point value Heating circuit pump OFF during set-point value
changes (by changing operating mode or changes
on rotary selector ts or button tm)
Mixing valve circuit
AA: 2
With output reduction through temperature With output reduction through temperature
sensor aJA sensor aJA
Coding – Vitotronic 300-K, MW1S
Possible change
A5: 0 Without heating circuit pump logic function
With heating circuit pump logic function:
Heating circuit pump OFF, if
AT > RT + 5 K
set
A5: 1 AT > RT + 4 K
set
A5: 2 AT > RT + 3 K
set
A5: 3 AT > RT + 2 K
set
A5: 4 AT > RT + 1 K
set
A5: 5 AT > RT + 1 K
set
A5: 6 AT > RT – 1 K
set
A5: 7 to
to AT > RT – 9 K
set
A5: 15
A6: 5 Extended economy function active, i.e. burner
to and heating circuit pump will be switched OFF,
A6: 35 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: 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
A9: 0 Without pump stop function
A9: 1 Pump stop function adjustable from 1 to 15
to
A9: 15
AA: 0 Without output reduction
AA: 1 No function
163