Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 154

Troubleshooting
Diagnosis (service scans)
Heat pump module diagnosis
The refrigerant circuit is controlled by the EEV controller, which communicates per-
manently with the control unit via KM BUS.
You can scan the following information in the heat pump module diagnosis:
■ Status and fault information of the EEV controller
■ Current refrigerant circuit temperature and pressure values
■ Last temperatures, evaporation and condensation pressures captured via the EEV
controller
■ Compressor hours run for the various load classes. A load class specifies the com-
pressor operation at a certain differential of evaporation and condensation tem-
perature ΔT
V/K
Diagnosis overview
Single stage (type BW)
EEV module
Ü
[ - ] :
Tsh, Tc [°C] :
pmop [bara]:
Ts, Tc [°C] :
ps, pc [bara]:
T1 [°C] :
x, P [ % ] :
Err [ - ] :
Back with
Two stage (type BW/BWS): stage 1
(type BW)
EEV module 1
Ü
[ - ] :
Tsh, Tc [°C] :
pmop [bara]:
Ts, Tc [°C] :
ps, pc [bara]:
T1 [°C] :
x, P [ % ] :
Err [ - ] :
Back with
154
(cont.)
0100 4000 0101
3.0, 68.0
15
-1.8, 60.3
6.95, 21.8
31.4
58 , - - -
00000001
ä
0100 4000 0101
3.0, 68.0
15
-1.8, 60.3
6.95, 21.8
31.4
58 , - - -
00000001
ä
Service menu:
1. Press OK + å simultaneously for
approx. 4 s.
2. "Diagnosis"
3. "Heat pump"
4. "EEV module"
Note
The information displayed in "EEV mod-
ule" is independent of the control unit
fault codes.