Tech
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IV.b.3) 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.
IV.b.4) 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.
IV.b.5) Defrosting time
Using this function the user determines for how long the pump is enabled once collector defrosting
function has been activated.
IV.c) Pumps
IV.c.1) Pump revolutions - regulated or constant
Using this function the user defines the mode of the pump operation: constant revolutions, when the
pump operates at all times at full power (when enabled) or regulated revolutions. In the case of
regulated revolutions, the user should adjust several additional parameters (see below).
IV.c.2) Maximum collector temperature
Using this setting the user declares the value of the collector maximum alarm temperature at which
the pump may be damaged. This temperature should be adjusted according to the collector technical
specification. Due to the phenomenon of glycol "gelation" at high temperatures and the risk of damaging
the solar pump, the pump is deactivated after reaching the maximum alarm temperature (the controller
switches to Collector overheat mode
.)
.
IV.c.3) Solar pump deactivation delta
This function determines the difference between the collector temperature and the tank temperature
at which the pump is deactivated (so as not to cool down the tank).
IV.c.4) Solar pump activation delta
This function determines the difference between the collector temperature and the tank temperature
at which the pump is enabled (this is the pump activation threshold).
IV.c.5) Gear coefficient
This parameter is available only if regulated revolutions option is selected. When the conditions for the
pump activation are met, it is initially activated at minimum speed (solar pump work minimum). Then
the pump speed increases according to this coefficient which determines the difference (°C) between
the collector temperature and the tank temperature at which the pump speeds up by 10%. The gear
coefficient applies only to the pump operating revolutions, namely the value of revolutions within the
limits of the solar pump work minimum (0% for the gear coefficient) as well as the solar pump work
maximum (100% for the gear coefficient). The greater the difference between the collector
temperature and the tank temperature, the higher the pump speed.
