Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 144

Coding Level 1
"Heating Circuit ..." Group
Coding in the factory set condition
"Extended economy mode"
a6:36 Extended economy mode disabled.
"Mixing valve economy function"
a7:0 Only for heating circuits with mixing
valve:
Without mixing valve economy function.
"Pump idle time"
a9:0 Without pump idle time.
"Room temperature hook-up"
b0:0 With remote control:*1
Heating mode/reduced mode:
Weather-compensated
"Room temperature-dependent heating circuit pump logic function"
b5:0 With remote control:
No room temperature-dependent heating
circuit pump logic function.
*1 Only change the coding for the heating circuit without mixing valve A1 for boilers without lower temperature
limit or for heating circuits with mixing valve if a remote control is connected to them.
144
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
(continued)
Possible change
a6:5
to
a6:35
a7:1
a9:7
a9:1
to
a9:15
b0:1
b0:2
b0:3
b5:1
to
b5:8
Extended economy mode enabled,
i.e. the burner and heating circuit pump
will stop and the mixing valve will be
closed at a variable value, adjustable
between 41°F to 95°F (5°C and 35°C)
plus 2°F (1°C). The base value is the
adjusted outdoor temperature. This
value is based on the actual outdoor
temperature and a time constant, which
takes the cooling down of an average
building into consideration.
With mixing valve economy function:
Heating circuit pump also OFF:
H Mixing valve tries closing for more than
20 min.
Heating circuit pump ON:
H Mixing valve in control mode.
H If there is a risk of frost
With pump idle time (heating circuit
pump turned off).
Function description page 131
Note: The maximum idle time is 10 h.
Pump idle time adjustable from 1 to 15.
1: Short idle time
15: Long idle time
Heating mode: Weather-compensated
Reduced mode: with room temperature
hook-up
Heating mode: with room temperature
hook-up
Reduced mode: Weather-compensated
Heating mode/reduced mode: with room
temperature hook-up.
For heating circuit pump logic function,
see the following table: