20
b)
parallel operation – the pumps operate independently of each other (according to their settings) and heat both
tanks at the same time.
•
Tank heating priority -
Option available only for scheme 9. Once this option has been selected, the pre-set tank
temperature is given priority
–
the valve does not switch to the heat receiver circulation until the pre-set tank
temperature is reached. Oscillation charging function does not apply in this situation.
3.3.
SOLAR COLLECTOR
These parameters enable the user to configure solar collector operation.
•
Overheat temperature
-
it is acceptable alarm temperature of the solar collector at which the pump is forced to
activate in order to cool down the solar panels. The discharge of warm water will take place regardless of the
tank pre-set temperature. The pump will operate until the tank temperature drops below the alarm temperature
by
alarm hysteresis
value (
Service Settings > Solar collector > Alarm hysteresis
) or until the tank reaches the
maximum acceptable temperature (
Service settings > Accumulation tank > Maximum temperature
).
•
Minimum heating temperature
- it is the collector threshold temperature. If the collector temperature is higher
and starts to drop, the controller disables the pump when the minimum heating temperature is reached. When
the collector temperature is below this threshold and starts to increase, the pump is activated when the
minimum
heating temperature plus hysteresis ( 3°C ) is reached. The threshold heating temperature is not active
in the emergency mode, manual mode or collector defrosting.
•
Anti-freeze temperature
- due to the different freezing temperatures of the liquid in the solar installation
anti-
freeze temperature
was introduced. This parameter determines the minimum safe temperature at which glycol
liquid does not freeze (temperature measured at the collector). In case of a significant drop in the collector
temperature (to the value of
anti-freeze temperature
), the pump is activated and operates continuously until the
collector reaches safe temperature. The setting range of this parameter is within -
50: +10°C
.
•
Alarm hysteresis
- Using this function the user sets the value of the collector alarm hysteresis. If the tank reaches
the alarm temperature (
Overheat temperature
) and the pump is activated, it will be deactivated again when the
collector temperature drops below the maximum temperature by alarm hysteresis value.
•
Defrosting time
–
using this function the user determines for how long the pump is enabled once collector
defrosting function has been activated.
•
Collector delta
- option available only for scheme no. 4. Only one heating circuit is always active in this
configuration. The switching valve switches the circulation to the collector whose temperature is currently higher
at least by the value of
collector delta
(it is the difference between the temperatures of the collectors).
3.4.
HEAT RECEIVER
This submenu is displayed only for schemes: 12,17
.
•
Maximum receiver temperature
- This parameter determines the maximum value of the receiver temperature
–
as long as the receiver does not reach this value, the tank-receiver pump remains active (provided that the
temperature of the upper tank sensor is higher than the temperature of the receiver). Once the temperature is
reached, the tank-receiver pump is disabled. The pump will be activated again after the receiver temperature
drops by the receiver hysteresis value (provided that the temperature of the upper tank sensor is higher than
the temperature of the receiver).
