22
Display
Description
Characteristics with time program
Within the time
phase
Outside the time
phase
"Demand"
If a draw-off pulse (min. 2 s) is registered at
the flow sensor, the secondary pump is
started and remains on until
"DHWcirc.runt."
has expired. The secon-
dary pump then remains off even if there is
a draw-off pulse, until the
"DHWcirc.pause"
has expired.
Demand
No DHW circulation
"OFF"
No DHW circulation
No DHW circulation
No DHW circulation
Manual balancing of the DHW circulation pump
1.
To comply with accepted engineering standards, set
the
"DHWcirc.spd"
so that
"
Δ
TDHWcirc.pipe"
.is
≤
5 K.
"
Δ
TDHWcirc.pipe"
is the current temperature dif-
ferential between the
"TDHW"
sensor (S2) and the
"TDHWcircRT"
sensor (S4 or S6).
2.
Use
"SaveDHWcirc.fl.rate"
to save the current
flow rate dV (top right-hand corner of the screen).
The value appears with
"DHWcirc.fl.rt"
.
The value
"DHWcirc.fl.rt"
must be deducted from
the
"Drawn total"
in m
3
to obtain the actual draw-
off rate (without DHW circulation).
Setting return stratification
Only possible if the return distribution set (accessories)
is installed.
For temperature-dependent stratification of the return
into the heating water buffer cylinder.
Press the following keys:
1.
for
"RT stratif."
.
2.
OK to confirm.
Display
Description
Factory setting
Setting range
"RT stratif."
Enable function.
Sensor used:
■
Individual control unit: S4
■
Cascade control unit: KS4
(highest value of all enabled
S4)
"No"
■
"No"
(disabled)
■
"Yes"
(enabled)
"Type"
Type of return stratification
"Thermostat"
■
"Thermostat"
(controlled via
sensor S4)
■
"Differential"
, controlled via
differential between sensors
S4 and S5. To connect sensor
S5, see page 8.
"T ON"
Only for
"Type"
"Thermostat"
:
Start temperature for return
stratification
"Thermostat"
35 °C
20 to 45 °C
"Hysteres."
Only for
"Type"
"Thermostat"
:
Stop hysteresis for return strati-
fication
"Thermostat"
5.0 K
0.5 to 20.0 K
Commissioning
Setting DHW circulation
(cont.)
5517 095 GB
Commissioning
Summary of Contents for VITOTRANS 353
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