Viessmann Vitocal 350-A Installation And Service Instructions Manual page 157

Control unit diagnostics
Note
While the compressor is running, the
control unit in this overview displays the
current test values. After the compressor
has shut down, the last values measured
during operation can be called up. These
values are only overwritten when the
compressor starts again.
Displays
Display Explanation
tpe °C Air intake temperature
tpa °C Air discharge temperature
tse °C Secondary circuit return temperature
tsa °C Secondary circuit flow temperature
p0 bara Evaporation pressure
pc bara Condensation pressure
Err/Msg Last fault information code before a compressor shutdown; display
system (see page 153) and explanation (see page 155) as before.
Hours run according to load classes
The compressor hours run given in the individual lines belong to the load classes
shown below. Column "1" shows the values for the heat pump, column "2" has no
function.
Heat pump 1
1. h :
2. h : 644
3. h : 671
4. h :
5. h :
1 2 T/P
(cont.)
2
0 0 0
0
0
0 0
0 0
RESET BACK
Heat pump 1
tpe °C :
19.8
tpa °C :
11.3
tse °C :
22.2
tsa °C :
31.5
p0 bara :
6.2
pc bara : 14.1
Err / Msg : 00000001 00000000
1 2
Load class Hours run for ΔT
1 ΔT
V/K
2 25 K < ΔT
3 32 K < ΔT
4 41 K < ΔT
5 ΔT
V/K
ΔT Differential, evaporation and con-
V/K
densation temperature
Troubleshooting
2
0.0
0.0
0.0
H BACK
V/K
< 25 K
< 32 K
V/K
< 41 K
V/K
< 50 K
V/K
> 50 K
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