TECH ST-402N PWM, Руководство пользователя, Страница: 24 / 32

ST-402N User's Manual v 1.0.3
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V.h.9) Deactivation Delta (return)
This option is only active in the case of setting the installation scheme number: 11.
This parameter determines the minimum difference between the tank temperature and the boiler
return circulation temperature at which the valve switches to the traditional boiler circulation (without
reheating)
V.h.10) Valve Delta
The regulator in this installation model controls the switching valve – if the temperature on the tank's
top sensor is higher than the valve's temperature plus the value of the valve's delta - the valve will
switch the circulation to the bottom part of the tank. The circulation will be switched to the tank's top
part again after these temperatures are level.
V.i) Alarm Sound
This function allows the user to activate or deactivate the acoustic signal after an alarm.
V.j) Factory Settings
The regulator is pre-configured for operation. However, it should be adjusted for own needs. Return to
the factory settings is possible at any moment. Activating the factory settings option cancels all the
user's settings of the Solar Installation Controller (saved in the user's menu) and replaces them with
the settings saved by the boiler's manufacturer. From that moment, the user may once again adjust
their own parameters. Restoring factory settings will result in setting the default installation scheme as
current.
V. Protections
In order to ensure safe and failure-free operation, the regulator has been equipped with a range
of safeguards.
1. Installation Sensor Protection.
If one of the sensors is damaged, an acoustic signal is activated and the following symbol will appear
on the right hand side of the display: An additional icon informing the user about the sensor
that is disconnected or is damaged will flash in the place of the displayed temperature of the damaged
sensor. In order to deactivate the alarm signal in the sensor's error mode, the user should press
the
Exit button.
2. Protection against Collector Overheat.
If the maximum temperature (alarm) is reached, the regulator proceeds to the so-called collector
overheat mode and the display will show the following symbol: . The pump begins to
operate in order to cool down the collector until the Tank's Maximum Temperature is reached or until
the collector's temperature drops by the value of the Alarm Hysteresis (see: SERVICE MENU > Solar
Collector> Alarm Hysteresis ) In the case of two tanks, both of them are used to cool down the
overheated collector (at the same time or successively, depending on the operation algorithm setting).
3. Heat Container Protection.
In the case of collector overheat, each tank may be heated to no more than the set value of the
maximum safe temperature. After reaching this temperature, the pump of a given tank is stopped (in
the system with two tanks with a valve, the circulation is switched to the second tank).
4. Fuse.
The regulator is equipped with a WT 3,15A tube fuse-link protecting the network,
CAUTION
Higher amperage should not be used. Higher amperage fuse should not be used as it may damage the
controller.