Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 128

Additional information
Coding 2
(continued)
Overview of all codings (continued)
Coding as per Function
factory setting
Address: Value
A5: 5 Boiler
circuit/
mixing
valve
circuit
A6: 36
Boiler
circuit/
mixing
valve
circuit
A7: 0 Mixing
valve
circuit
A9: 7
Boiler
circuit circuit
AA: 2
Mixing
valve valve
circuit
*1
Based on the damped outdoor temperature which is calculated from the current outdoor temperature and a time constant which takes
into account the cooling characteristics of an average building.
128
With the heating circuit
p pump logic function (HPL p g (
function), the heating circuit
pump is switched off when
the outdoor temperature
(OT) rises 1 K above the
desired room temperature
(RT ).
des
OT > RT + 1 K
des
Automatic changeover from
normal heating to summer
operation not active
Without mixing valve energy
saving function
With pump stoppage time:
Heating circuit pump logic Heating circuit pump logic
function with change of set-
point (through changing the ope-
rating mode or changes on the
"ts" selector knob or "tm")
With output reduction via
temperature sensor aJA temperature sensor aJA
New coding Possible change
Address:
Value
A5: 0 Without heating circuit pump logic function
(HPL function)
A5: 1 With heating circuit pump logic function
A5: 2 (HPL function):
A5: 3 The heating circuit pump is switched off if
A5: 4 OT > RT
des
A5: 5 OT > RT
des
A5: 6 OT > RT
des
A5: 7 OT > RT
des
. OT > RT
des
. OT = RT
des
OT > RT
.
des
A5: 15 .
.
.
OT > RT
des
A6: 5 Automatic changeover from normal heating to
to summer operation
A6: 35 from 5 to 35°C plus 1°C / 41 to 95°F plus
2°F at which the burner and heating circuit
pump are switched off and the mixing valve is
closed
A7: 1 With mixing valve energy saving function
(extended heating circuit pump logic)
The heating circuit pump can be switched off
additionally when the mixing valve has been
closed for longer than 20 minutes.
The heating circuit pump is switched on again
When the mixing valve goes to its control
mode
After the DHW tank has been
heated (for 20 minutes)
When there is a risk of freezing
A0: 0 Without pump stoppage time
A9: 1 With pump stoppage time
to adjustable from 1 to 15
A9: 15
AA: 0 Without output reduction
AA: 1 Without function
+ 5 K
+ 4 K
+ 3 K
+ 2 K
+ 1 K
–1 K
–9 K
*1
at a variable setting value