143
5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Coding Level 1
Coding in the factory set condition
Possible change
“Extended control function”
20:0
No extended control function enabled.
20:1
Additional function for DHW heating.
20:2
Differential temperature control 2.
20:3
Differential temperature control 2 and auxiliary
function.
20:4
Differential temperature control 2 for central
heating backup.
20:5
Thermostat function
20:6
Thermostat function and auxiliary function.
20:7
Solar heating via external heat exchanger
without additional temperature sensor.
20:8
Solar heating via external heat exchanger with
additional temperature sensor.
20:9
Solar heating of two DHW storage tanks.
“Solar” Group
(continued)
“Heating Circuit ...” Group
Coding
Coding in the factory set condition
Possible change
“Storage tank priority”
a2:2
Tank priority control for heating circuit
pump and mixing valve.
a2:0
Without storage tank priority applicable
to heating circuit pump and mixing valve.
a2:1
Storage tank priority only applicable to
mixing valve.
a2:3
to
a2:15
Modulating priority applies to mixing
valves, i.e. the heating circuit receives
a reduced amount of heat.
“Heating circuit pump logic function (economy control)”
a5:5
With heating circuit pump logic function
(economy control): heating circuit pump
OFF when the outdoor temperature (OT)
is 2°F (1 K) higher than the set room
temperature (RTset) OT > RTset +2°F
(1 K).
a5:0
Without heating circuit pump logic
function.
a5:1
to
a5:15
With heating circuit pump logic function:
Heating circuit pump OFF, see the
following table.
Coding address
a5:...
With heating circuit pump logic function:
Heating circ pump OFF
1
OT > RTset +9°F (+ 5 K)
2
OT > RTset +7°F (+ 4 K)
3
OT > RTset +5°F (+ 3 K)
4
OT > RTset +4°F (+ 2 K)
5
OT > RTset +2°F (+ 1 K)
6
OT > RTset
7
to
15
OT > RTset –2°F (– 1 K)
OT > RTset –16°F (– 9 K)
