TECH ST-402N PWM, Руководство пользователя, Страница: 18 / 32

ST-402N User's Manual v 1.0.3
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following modes:
a) Priority of Tank 1 – first, tank 1 is heated (only pump 1 operates), after the set temperature
is reached, pump 2 is activated and reheats tank 2.
b) Parallel Operation – the pumps operate independently of one another, each within its own
range (according to the settings) and both tanks are heated at the same time.
V.b.12) Tank Reheating Priority
Option active only in the case of setting the installation scheme number: 9.
After the user marks this function, the tank's set temperature is treated as a priority – the valve
does not switch to the circulation with the heat receiver until the tank's set temperature is reached.
The function of oscillation loading is not taken into account in this situation.
V.c) Solar Collector
This menu allows the user to adjust all parameters related to the Solar Collector.
V.c.1) Overheat Temperature
This is the Solar Collector's acceptable alarm temperature 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's set temperature. The pump will operate until its temperature drops below the alarm temperature
by the
Alarm Hysteresis Value ( Service Settings > Solar Collector > Alarm Hysteresis ) or until the tank
reaches the maximum acceptable temperature ( Service Settings > Accumulation Tank > Maximum
Temperature )
V.c.2) Minimum Reheating Temperature
This is the collector's threshold temperature. If the temperature within the collector is higher and is
dropping after reaching the minimum reheating temperature, the pump is deactivated. On the other
hand, when the temperature on the collector is below this limit and is increasing - the pump is activated
after reaching the minimum reheating temperature plus hysteresis - 3°C. The threshold reheating
temperature is not active in the emergency mode, manual operation or collector defrosting.
V.c.3) Anti-Freeze Temperature
Due to the different freezing temperatures of the liquid in the solar installation, the Anti-Freeze
Temperature was introduced. This parameter determines the minimum safe temperature when the
glycol liquid does not freeze (temperature measured on the collector). In the case of a significant drop
in the collector's temperature (to the value of this parameter), the pump is activated and operates
continuously until the collector is heated to a safe temperature. The settings range of this coefficient is
within -50: +10°C.
V.c.4) Alarm Hysteresis
Using this function, the user declares the value of the collector's alarm hysteresis. If the tank reaches
the alarm temperature (
Overheat Temperature ) and the pump is activated, it will deactivate again when
the collector's temperature drops below the maximum temperature by the value of this hysteresis.
V.c.5) Defrosting Time
Using this function, the user determines for how long the pump is activated after the activation of the
function
Collector Defrosting .
V.c.6) Collector Delta
Option active only in the case of setting the installation scheme number: 4.
Only one heating circulation is always active in this system. The switching valve is to switch the
circulation to the collector that currently has temperature higher at least by the value of collector delta
(this is the difference in temperatures of both Collectors).