Starting Time High Efficiency Circulation Pump - Viessmann VITOTRONIC 200 Service Instructions Manual

Parameter group Internal hydraulics

7365 Starting time high efficiency circulation pump

If 1 high efficiency circulation pump each is used for
DHW heating and central heating:
In order to avoid high starting currents, HE circulation
pumps will increase their output in stages after start-
ing. Consequently, the flow rate in the start-up phase is
very low.
If a changeover between central heating and DHW
heating occurs during defrosting, the temperature in
the condenser can drop severely as a consequence of
the high heat extraction in the case of a low flow rate.
To prevent the condenser from freezing up during this
process, the flow rate in the secondary circuit can be
assured by a run-on of the circulation pump that was
active prior to the changeover.
7378 Screed program start day
After the temperature/time profile has been selected
with "Time program for screed drying 7303" screed
drying starts immediately.
Parameter "Screed program start day 7378" can be
used to set the position of the start day within the tem-
perature/time profile.
Note
"Heat pump for drying a building 7300" must be set
to "1" in order for the heat pump to be switched on for
screed drying.
Example:
At setting "4", screed drying immediately starts with
the set flow temperature of day 4: See temperature/
time profile in fig. 59.
If "Screed program end day 7379" is set to "0",
screed drying will only last for 27 days instead of
31 days.
C
A
50
40
30
20
10
1 5 10 15
Fig. 59
Set flow temperature
A
Days
B
Start day: "Screed program start day 7378" =
C
"4"
232
!
20 25 30
B
!
The selected value sets the duration of this run-on
time.
Setting in s
The setting value is the start day.