Velux TFF 200, Directions For Use Manual

Page: 45 / 56

45 VELUX
SECTION III: SOLAR CONTROL SYSTEM SECTION III: SOLAR CONTROL SYSTEM
The heat quantity transported is measured by the
indication of the volume flow and the reference sen-
sor of feed flow S1 and return flow TRF. It is shown
in kWh-parts in the indication channel
kWh and
in MWh-parts in the indication channel MWh . The
sum of both channels forms the total heat output.
The heat quantity added up can be reset. As soon as
one of the display channels of the heat quantity is
selected, the symbol
is permanently shown on
the display. The button (3) must pressed for
approx. 2 seconds in order to get into the RESET-
mode of the counter. The display-symbol
is
flashing and the value for heat quantity will be set
to 0, if the button
is pressed within 5 seconds.
In order to finish the RESET-operation, the button
"
" must be pressed in order to confirm within
5 seconds once again.
In order to cancel the RESET-operation, no button
should be pressed for about 5 seconds. The control-
ler returns automatically into the indicaton mode.
Please note:
Channels
kWh
and
MWh
are only
available during the activated option heat quantity
measurement (
OHQM ).
4.1.8 ∆T-regulation
Initially the controller works in the same way as
a standard differential controller. If the switch-on
difference (
DTO / DT1O / DT2O / DT3O ) is reached, the
pump is activated and after having got an impulse
(10 s) a minimum pump speed (nMN = 30%) is run.
If the adjusted nominal value of the temperature dif-
ference (
DT S / DT1S / DT2S / DT3S ) is reached, the
pump speed is increased by one step (10%).
If the difference increases by 2 K (
RIS
/
RIS1
/
RIS2
/
RIS3 ), the pump speed is increased by 10% respec-
tively until the maximum pump speed of
100% is reached. The response of the controller can
be adapted by means of the parameter "Raise".
If the adjusted switch-off temperature is under run
(
DT F / DT1F / DT2F / DT3F ), the controller
switches off.
Please note:
Switch-on temperature difference DO
must be at least 0,5 K higher than the switch-off
temperature difference DF.
MED%:
Concentration of anti-
freeze in (Vol-)%.
MED% is blinded out
by MEDT 0 and 3.
Adjustement range:
20 ... 70
Factory setting: 45
kWh / MWh:
Heat quantity in
kWh/MWh
Display channel
DT 0 / DT10 / DT20 /
DT30:
Switch-on temperature
Adjustment range:
1.0 ... 20.0 K
Factory setting: 6.0
DT F / DT1S / DT2S /
DT3F:
Switch-off
temperature difference
Adjustment range:
0.5 ... 19.5 K
Factory setting: 4.0 K
DT S / DT1S / DT2S /
DT3S
:
Nominal temperature
difference
Adjustment range:
1.5 ... 30.0 K
Factory setting: 10.0 K
RIS / RIS1 / RIS2 / RIS3:
Raise
Adjustment range:
1 ... 20 K
Factory setting: 2 K