Viessmann VITOCAL 350-A, Installation And Service Instructions Manual

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151
Heat pump module diagnosis
The refrigerant circuit is controlled by the EEV controller, which communicates per-
manently with the heat pump 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 flow and return temperatures in the primary and secondary circuits, and evap-
oration and condensation pressure 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
1. "Device settings"
2. "Contractor level" (for "Contrac-
tor" access rights see page 168)
3. "Further menu items"
4. For "Diag. HP module" see chapter
"Diagnosis overview"
5. "
Ó
T/P " for the last compressor tem-
perature and pressure val-
ues captured; see chapter
"Temperature and pressure
values"
Note
If the heat pump stops due
to a fault, the data is
retained. Otherwise the val-
ues are overwritten when
the compressor starts
again.
6. "
Ó
H " for hours run by the heat
pump in a particular load sit-
uation. See chapter "Hours
run according to load
classes"
Troubleshooting
Control unit diagnostics
(cont.)
5414 828 GB
Service