13.6. Solar thermal scheme E
Loading of two DHW reservoirs A and B with
priority function for reservoir A.
Fig. 13.5 Solar thermal scheme E
Both reservoirs are loaded up to the
temperature set as TsDHW, measured at T2
sensor for reservoir A or T3 sensor for reservoir
B. The controller checks which reservoir has not
reached the temperature preset and decides on
loading to this reservoir.
If neither of the reservoirs has reached
the temperature preset, the controller first loads
the reservoir A (reservoir A priority).
The collector pump P1 for the reservoir A
or P2 for the reservoir B will be started at 100%
capacity for the reservoir (depending on which
one has not reached temperature preset), if the
difference between T1 and T2 (for reservoir A)
or T1 and T3 (for reservoir B) exceeds the value
of dTonDHW setting. The pump will be working
for the time specified in tP setting. If after this
time the difference between T1 and T2 or T3 is
still above dTonDHW, the pump speed will
remain at 100%. If the said difference between
temperatures drops below dTonDHW, the
controller will start reducing the pump speed,
until the value of dToffDHW is reached.
If the difference between T1 and T2 or T3 is
between the values dTonDHW ÷ dToffDHW,
the controller will calculate and set the pump
speed proportionally.
When dToffDHW is reached, the pump will work
at minimal speed (Pmin), below it will be
stopped.
System will switch again to reservoir A
loading, when the temperature drops below the
value of HP1 hysteresis.
Operating algorithm of the collector pump P1
with the reservoir A is identical as for the pump
P2 at loading the reservoir B.
When both reservoirs reach the temperature
preset TsDHW, the collector pumps will be
stopped. The will be started at the moment,
when in one of the reservoirs the temperature
drops in relation to the temperature preset of
hysteresis: respectively HP1 for P1 pump and
HP2 for P2 pump. Eventually, when the
temperature at the collector sensor T1 will reach
critical value (TCOLcr). Then, the controller will
allow switching on the collector pump for the
reservoir A or B (with the priority for the
reservoir A), by the time, when the reservoirs
temperatures reach TDHWmax. This will cause
the collector pumps to stop.
List of settings in Adjustment menu:
TsDHW- Reservoir temperature preset A or B.
Night cooling- YES switches on / NO switches
off night cooling mode in hours 0
00
÷5
00
.
Night cooling ON – DHW reservoir temperature
(T2 sensor), when exceed at 0
00
, if night
cooling function is enabled, the controller will
decide on night cooling activation.
Night cooling OFF – DHW reservoir
temperature (T2 sensor) to which the
controller will be cooling down the reservoir
(if night cooling function is enabled and if in
hours 0
00
÷5
00
Night cooling ON
temperature has been exceeded).
Alarm TCOLcr – Switching on (YES) or off (NO)
the alarm on exceeding TCOLcr
temperature. This function will not affect the
controller operation. If the parameter is set
as NO, the controller will not alarm after
exceeding TCOLcr temperature at the
collector sensor.
13.7. Solar thermal scheme F
Loading of DHW reservoir and pool with priorities
function.
Fig. 13.6 Solar thermal scheme F
Depending on Priority setting
(Pool/DHW), the system will first load the
circuit to temperature preset of TsDHW or
TsPOOL.
If the reservoir circuit has priority and it
has not reached its temperature preset, then the
collector pump will be started with 100%
capacity, if the difference between T1 and T2
exceeds value of dTonDHW, and it will be
working for the time specified in parameter tP. If
after this time the difference between T1 and T2
is still above dTonDHW, the pump speed will
remain at 100%. If the said difference between
T1 and T2 drops below dTonDHW, the controller
will start reducing the pump speed, until the
difference between T1 and T2 reaches the value
specified as dToffDHW. If the difference
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