5
The operation of the controller is determined depending on the set parameters
and the measured temperature of the solar panel and the boiler as follows:
А)
Normal operating modes
- If the differential temperature (
∆t)
of the solar panel (fireplace) and the
boiler is greater than the set point
∆Т
+ 2 °C, the pump is switched on and the boiler
is heated from the panels. In the process of heating the boiler,
∆t
decreases. Once
the actual
∆t
is aligned with the set
∆Т
, at certain intervals, a
start
and
stop
signal
from the relay output is sent to the pump. The work and pause intervals depend on
the difference between
∆Т
and
∆t
. The smaller the difference, the longer the
interval for pump operation and the smaller the pause. When
∆t
becomes equal to or
less than zero, the pump stops. Adjustment is with a period of
600s (10 min).
- The boiler is heated under the above conditions only until the temperature
in the boiler is equal to the set
Tb
set
, after which the pump is switched off and the
heating is stopped;
- If the temperature of the panels (fireplace, boiler) falls below Tpmin, the
pump operation is prohibited, even though the conditions
∆t>∆T+2 °C
and
Tb<Tb
set
may be present;
-
At the temperature of the panels below
Тp
def
and the anti-freeze function
enabled, the pump is forced to start, even though it was switched off due to the
temperature drop below
Тp
min
;
- If in the previous mode the temperature of the boiler becomes lower than
Тb
min
, the pump is switched off by stopping the defrosting of the panels;
В)
"
Vacation
"
mode.
The mode is intended for cases when no hot water is
consumed from the boiler for a long time. When activated, the set boiler
temperature is set to 40 °C. The pump is switched on when necessary to prevent the
panel from overheating (
Тp
max
).
Activate/deactivate the mode - by pressing and holding "▄" button for more than
3 seconds. After releasing the button, an icon lights up on the display.
C) Emergency modes
- If during the boiler heating process the temperature of the panels (fireplace)
exceeds Tpmax, the pump is forced to cool the panels. This is done even though the
temperature in the boiler may exceed
Tb
set
;
-
If in the above emergency mode the temperature in the boiler reaches the
critical maximum value
Тb
max
,
the pump is switched off even though this may
cause the panels to overheat. Thus the temperature in the boiler is of higher priority;
- When the temperature of the boiler
Tb
is above the set
Tb
set
and when the
temperature of the solar panels
Tp
falls below the temperature of the boiler, the
pump is switched on until the temperature
Tb
drops to the set
Tbset.
This cooling can be delayed from 0 to 5 hours. Sets using the parameter
t
cool
(
tcc
). Default setting is 4 hours.
Summary of Contents for DT-3.1
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