Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 166

Coding Level 2
"Heating Circuit ..." Group
Coding address
a3:...
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
to
15
Coding in the factory set condition
"Frost protection"
a4:0 With frost protection
"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).
Coding address
a5:...
1
2
3
4
5
6
7
to
15
166
(continued)
Heating circuit pump "ON"
14°F (–10°C)
16°F (–9°C)
18°F (–8°C)
19.5°F (–7°C)
21°F (–6°C)
23°F (–5°C)
25°F (–4°C)
27°F (–3°C)
28.5°F (–2°C)
30°F (–1°C)
32°F (0°C)
34°F (+1°C)
to
57 F (+14°C)
With heating circuit pump logic function: Heating circuit pump "OFF"
OT > RTset 9°F (+ 5 K)
OT > RTset 7°F (+ 4 K)
OT > RTset 5°F (+ 3 K)
OT > RTset 4°F (+ 2 K)
OT > RTset 2°F (+ 1 K)
OT > RTset
OT > RTset 2°F (– 1 K)
OT > RTset 16°F (– 9 K)
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Heating circuit pump
Heating circuit pump "OFF"
18°F (–8°C)
19.5°F (–7°C)
21°F (–6°C)
23°F (–5°C)
25°F (–4°C)
27°F (–3°C)
28.5°F (–2°C)
30°F (–1°C)
32°F (0°C)
34°F (+1°C)
36°F (+2°C)
27°F (+3°C)
to
61°F (+16°C)
Possible change
a4:1 No frost protection;
this setting is only possible if code a3:9
has been selected.
Note: "Important" also coding address
"a3".
a5:0 Without heating circuit pump logic
function.
a5:1 With heating circuit pump logic
to function: Heating circuit pump OFF,
a5:15 see the following table.