Technische Alternative UVR 16x2 User Manual

DHW circulation
162
Parameters
Operating mode
Available for selection: Time, Pulse, Time/pulse (Pulse and
Time/pulse only possible if a sensor for T.DHW has been defined.)
T.DHW circ. return
T.DHWcirc. set
Diff. on
Diff. off
Display of the DHW circulation set temperature as per the input
variable
Start differential for T.DHWcirc. set or for the effective set value
resulting from mixing protection
Stop differential for T.DHWcirc. set or for the effective set value
Pulse mode
(shown only with operating
mode Pulse and
Time/pulse and defined
sensor T.DHW)
dDiff. on
Runtime
Pause time
A temperature change of at least x K / second at sensor T.DHW starts
the pump.
Maximum runtime per interval
Minimum time between two pump runs
Mixing protection
(shown only with defined
cylinder sensor
T.cylinder)
T.cylinder min.
Mixing differential
DHW circulation will not be permitted below this cylinder temperature
(fixed hysteresis = 3 K)
Minimum differential between T.cylinder and effective DHW
circulation return temperature
➢ For hygienic, on-demand DHW heating (in a freshwater module), the Pulse mode can be
utilised as an alternative control method with the aid of the DHW sensor T.DHW. This
requires an ultra-fast temperature sensor (MSP... = special accessory) at the DHW outlet of
the plate heat exchanger. T.DHW is used to control both the heating of the water and its
circulation. When a tap is opened briefly, the temperature at T.DHW changes. If an
adjustable jump in temperature is captured at T.DHW within a second, the controller will
switch on the DHW circulation pump. The pump stops either at the end of the set runtime or
when the set value is exceeded at T.DHWcirc., whichever occurs first. Hot water is thus
supplied to the draw-off point within a short time without the tap being open continuously.
➢ The Pulse mode is very reliable for the control of hygienic, on-demand DHW heating when
used with an ultra-fast sensor. If standard sensors are used, the temperature change is
detected much more slowly. Instead of this temperature capture, a flow switch (STS01DC
= special accessory) can also be used for the DHW circulation function. The sudden, jump-
like digital signal of the flow switch at the DHW temp. input variable causes the DHW
circulation pump to be switched on immediately (no retriggering during the runtime or pause
time).
➢ Mixing protection stage 1: The DHW circulation function is blocked below the minimum
cylinder temperature T.cylinder min. so that the running pump does not cause the stratified
residual energy in the cylinder to be lost.
➢ Mixing protection stage 2: To prevent mixing through the cylinder content above the
T.cylinder min. threshold, the differential between the cylinder temperature and the return
temperature is measured (mixing differential). If the cylinder temperature less the Mixing
differential is lower than the set return temperature T.DHWcirc. set, that value will apply as
the new set temperature for DHW circulation return (output variable: Effective set circ. rtn
temp). Mixing protection is disabled if there is no cylinder sensor T.cylinder.

Technische Alternative UVR 16x2 Specifications

General

Brand	Technische Alternative
Model	UVR 16x2
Category	Controller
Language	English