Heating Circuit 1, 2 And 3 - Viessmann Vitocrossal 300 Series Service Instructions Manual

Vitocrossal 300 CU3A 26 to 199 Service

Heating Circuit 1, 2 and 3

Coding in the factory setting
Extended economy function mixing valve
A7:0 Without mixing valve economy
function (only with circuits with
mixing valve)
Pump idle time, transition reduced mode
A9:0 Without pump idle time
Room temperature hook-up
B0:0 Only with heating circuit with
mixing valve and remote control.
Heating mode and reduced mode.
Economy function room temperature
B5:0 With remote control: No room
temperature dependent heating
circuit pump logic function
Parameter address
B5:...
1
2
3
4
5
6
7
8
(continued)
Possible change
A7:1
A9:1
to
A9:15
B0:1
B0:2
B0:3
B5:1
to
B5:8
With heating circuit pump logic function:
Heating circuit pump "OFF"
RTactual > RTset + 5 K
RTactual > RTset + 4 K
RTactual > RTset + 3 K
RTactual > RTset + 2 K
RTactual > RTset + 1 K
RTactual > RTset
RTactual > RTset - 1 K
RTactual > RTset - 2 K
With mixing valve economy function
(extended heating circuit pump logic):
Heating circuit pump also "OFF":
- If the mixing valve has been
closed for longer than 20
minutes.
Heating circuit pump "ON":
- If the mixing valve changes to
control function.
- If there is a risk of frost.
With pump idle time:
Heating circuit pump "OFF" if the set
value is altered through a change in
operating mode or through a change in
the set room temperature With pump
idle time, adjustable from
1 to 15.
1= Short idle period
15= Long idle period
Heating mode: weather-compensated
Reduced mode: with room temperature
hook-up.
Heating mode: with room temperature
hook-up Reduced mode.
Heating mode/reduced mode:
with room temperature hook-up.
Heating circuit pump logic function,
see the following table:
Heating circuit pump "ON"
RTactual < RTset + 4 K
RTactual < RTset + 3 K
RTactual < RTset + 2 K
RTactual < RTset + 1 K
RTactual < RTset
RTactual < RTset - 1 K
RTactual < RTset - 2 K
RTactual < RTset - 3 K
Coding 1
59