Integrals - Viessmann VITOTRONIC 200 Service Instructions Manual

System
(cont.)
Active events
"Defrost HP (latest)"
"Natural defrosting"
"Delay ht pump OM change-
over"
"Refrigerant circuit functions"
"HP protection functions"
"Delay DHW/heating"
"IWB heat pump blocking
time"
"IWB elec. heater blocking
time"
"IWB ext. HS blocking time"
"External heat source"
"Events"
Note
■ The times specified depend in part on the heat pump
type.
Some specified times can only be changed by a heat
■
pump installer certified by Viessmann.

Integrals

Some system components are only started when the
relevant temperature limit is undershot or exceeded if
the start integral has also exceeded the associated
start threshold, e.g. "Start threshold 730E". The start
integral is calculated from the level and duration of the
limit excess or shortfall.
Condition: Heating/cooling demand is low.
Meaning
For defrosting by refrigerant circuit reversal:
If the evaporation temperature falls below the specified
defrost threshold, the next defrost process begins at
the latest when the duration shown has expired.
Remaining duration for defrosting with ambient air:
This is where the fan channels warm ambient air over
the evaporator. No heat is extracted from the secon-
dary circuit. The compressor does not run.
Compressor runtime extension after changeover from
DHW heating to central heating
Max. time for suction gas pressure control
Max. time during which the minimum temperature
■
differential between condenser and evaporator does
not have to be reached.
For refrigerant circuit reversal:
■
Max. time during which the evaporation temperature
may be below 0 °C.
Max. duration of DHW heating if there is a heat de-
■
mand from the heating circuits.
or
Max. duration of central heating if there is a heat de-
■
mand from the DHW cylinder.
During this time, no integrals are built for start thresh-
olds
External heat generator minimum runtime
External heat generator minimum runtime without heat
demand
With 2-stage refrigerant circuit:
Time, until the other compressor may be switched on.
The heat pump control unit calculates various inte-
grals.
1. Service menu:
2. "Diagnosis"
Press and hold OK +
å
approx. 4 s.
Diagnosis
Factory-set times
60 or 240 min
60 min
120 s
10 min
10 min
"Max. runtime DHW
heating in heating
mode 6011"
0.5 x "Start delay in-
stantaneous heat-
ing water heater
7905"
"Start delay instan-
taneous heating wa-
ter heater 7905"
"Start delay exter-
nal heat source
7B04"
20 min
10 min
20 min
simultaneously for
121