pump runs with minimum rpm value (Pmin
parameter) and in case it has dropped below this
value, the pump stops.
If, in case of operation with one solar
collector, temperature of the second collector has
grown above the temperature of the first one (or
v.v.) and the value of dTonDHW has been
reached, the regulator switches over the solar
collector circuit.
Once the pump has stopped, P2 valve is set
at “0” (power supply is cut off).
The system operates until the temperature of
water in DHW tank has reached the value set in
TzCWU (read-out of T2 sensor), then it stops.
Once T1 or T3 temperature of solar
collector has reached the critical value of
TCOLkr, the regulator (despite the set
temperature of TzCWU has been reached) allows
to start P1 collector serving pump and to set P2
valve at the solar collector of higher temperature
in order to reduce the temperature of the
collectors below the value of HP1 hysteresis.
Once the temperature of DHW tank has
reached the value of TCWUmax (read-out of T2
sensor), the regulator, in-spite of reached critical
temperature of the collectors (TCOLkr), stops
collector serving pumps to prevent collector
cooling down. It protects DHW tank from
overheating.
List of parameters in Adjustment menu
TzCWU - set temperature of DHW tank.
Night cooling – YES / NO - switches on/off
night cooling mode active from 00
00
÷ 05
00
.
Night cooling ON – temperature of DHW tank
(read-out of T2 sensor), upon excess of
which, the regulator will activate night
cooling mode at 0
00
(provided that night
cooling function is enabled).
Night cooling OFF – temperature of DHW tank
(read-out of T2 sensor) to which the
regulator will cool down DHW tank (provided
that night cooling function is enabled and
temperature of Tschł WŁ has been exceeded
within the period of time from 00
00
to 05
00
).
Alarm TCOLkr – switches on (YES) or off (NO)
the "Temperature of TCOLkr exceeded"
alarm. This function does not affect the
regulator operation. Setting this parameter
at "NO” causes the regulator will not produce
the alarm of exceeded TCOLkr temperature
for T1 and T3 solar collector sensors.
13.14. Solar thermal scheme M
Loading of the DHW container with low-
temperature function assisting to loading of the
CH installation and controlling from CT7 room
temperature sensor.
Fig. 13.13 Solar thermal scheme M
The collector pump P1 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 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
container temperature at T2 sensor reaches the
value of TDHWmax.
If the temperature in the heated room
reaches Room temp. then the room
temperature sensor CT7, at input T3, will affect
at the regulator which will switch off the P2
pump. It is necessary here to fulfill the condition
that the temperature T2 must be above the
TsDHWmin heater parameter.
List of parameters in Adjustment menu
TsDHW – Preset container temperature.
TsDHWmin heater – The minimum temperature
for the DHW container below which the P2
pump will be switched off independently of
the room temperature sensor CT7. If the
temperature of the DHW container does not
rise above the TsDHWmin heater value,
the P2 pump remains off.
dTAB- temperature difference between A buffer
and system return (on T3 and T4 sensors),
after which the regulator switches three-way
valve. P2 is enabled, when dTAB difference
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