between T1 and T2 is between the values
dTonDHW ÷ dToffDHW the controller will
calculate and set pump speed proportionally.
When dToffDHW is reached, the pump will
work at minimal speed (Pmin), below it will be
stopped.
After reaching preset temperature in priority
circuit, the controller will switch the circuit.
The pool circuit will work analogically, except
that the temperatures are calculated from T1 and
T3 and the system uses auxiliary deltas
dTonPOOL ÷ dToffPOOL. Pool exchanger P2
pump is always switched on/off with delay as
specified in tDLY setting in relation to P1 pump.
When the second circuit is heated up to
preset temperature, the collector pump is
stopped. It will be restarted, when on any circuit
the temperature drops by hysteresis value
(HP1), in accordance with priority setting.
If the collector temperature reaches
TCOLcr value, the collector pump will be started
and the circuit will be switched to priority one in
order to reduce the collector temperature. It will
be stopped, when T1 temperature drops below
T1<TCOLcr-HP1.
If Priority is set for DHW, the collector
unloading will be continued only to the time when
TDHWmax is reached, and then the system
switches to the pool. In the pool circuit there is
no upper limit for discharging collector’s critical
temperature.
Switching between DHW/POOL is
controlled through H output. The circuit operation
starts only when the switching time elapsed
(tVALVE).
Due to pool system, the scheme has no
night cooling function.
List of settings in Adjustment menu
TsDHW- Reservoir temperature preset.
TsPOOL- Pool temperature preset
Priority- Priority setting: reservoir (DHW) or
pool (POOL) loading.
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 when
TCOLcr temperature is exceeded at the
collector sensor.
13.8. Solar thermal scheme G
Loading of DHW reservoir with solar collector
and boiler.
Fig. 13.7 Solar thermal scheme G
The collector pump will be started with
100% capacity, if the difference between T1 and
T2 exceeds value of dTonDHW setting
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 between T1 and T2
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.
If TsDHW temperature is reached for
sensor:
T2- reservoir loading from collector will be
stopped;
T3 – reservoir loading from boiler will be
stropped.
The reservoir loading will be restarted,
when one of the temperatures T2 or T3 drops
below hysteresis HP1 for T2 or HP2 for T3.
If the collector temperature T1 reaches
the value of TCOLcr, then the collector pump will
be started (despite of reaching TsDHW
temperature). It is aimed to reduce the
collector’s temperature. It will be stopped, when
T1 drops below T1<TCOLcr-HP1, or if the
reservoir temperature at T2 sensor reaches the
value of TDHWmax.
The boiler pump P2 will be switched on at
power 100% when the temperature T3 exceeds
87ºC and will be work until the temperature T3
falls below 77ºC.
If during the active function of the
regulator - cooling by the boiler, the temperature
on T3 and T4 will be equal, this function will be
stopped. The function will be reactivated again
when the temperature T4 will be lower than T3
by the hysteresis value HP2.
List of settings in Adjustment menu
TsDHW- Reservoir temperature preset.
dTCO – Minimal temperature difference between
T4 and T3 that starts loading of DHW
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