Circulation - oventrop Regtronic RQ Installation And Operating Instructions For The Specialised Installer

3.3.2 Circulation

The Circulation function can be used for control-
ling a circulation pump.
For the circulation, 3 circulation modes are available
in 6 combinations:
Circulation modes:
• Permanent
• Thermostatic
• Demand
Each combination of the 3 circulation modes has a
timer function by means of which time frames can
be adjusted. In any combination, the circulation mode
named fi rst is active within the adjusted time frames.
The second mode is active outside of the adjusted
time frames:
Active within the Active outside the
time frames time frames
1. Permanent + Off
2. Therm + Off
3. Demand + Off
4. Permanent + Therm
5. Permanent + Demand
6. Therm + Demand
When one of the circulation modes is selected, the
corresponding adjustment channels will appear.
22
Note:
The circulation function must be activated
in order to use the thermal disinfection
function.
R2
R4
S1
S2
secondary side
Primärseite Sekundärseite
Permanent
The circulation pump is permanently active.
Thermostatic
When the temperature at the circulation return sen-
sor falls below the adjusted value T -circ therm by
the non-adjustable hysteresis of -2 K, the circulation
pump is switched on.
The controller aims to keep the temperature at the
HW fl ow sensor at T-HW set.
When the temperature at the circulation return
sensor exceeds the adjusted value T -circ therm by
the non-adjustable hysteresis of +2 K, the circulation
pump is switched off.
Sensors S3 to S7 can be used as the reference sensor.
Note:
T -HW set is blocked against T -circ therm
when the circulation mode Thermal is acti-
vated. The set value can only be decreased
down to a minimum limit which calculates
as follows:
T -circ therm + 2 K + ∆T circ
(see page 23).
Demand
A draw-off that takes less than 2 s ist detected as a
draw-off impulse.
If the VFD registers a draw-off impulse, the circula-
tion pump will be activated for the adjustable Circ.
runtime.
The demand can also be triggered by means of a
switch. For this purpose, connect the switch to the
S8 input.
If the circulation has ended after having been active
because of a demand, any further draw-off impulses
will be ignored for the adjustable Circ. off-time.
When a draw-off takes place while the circulation is
active, the circulation pump is not switched off.