17
Protection against
Legionella
(bacteria)
Enabling the function Protection against Legionella causes periodic (once a week – from Sunday to Monday from 12.00 a.m.
up to 6.00 a.m.) heating of water in the water heater up to temp. of 70C. After enabling the option the L symbol will be displayed
on the main screen of the controller. The active function is indicated by the blinking L symbol and starts the boiler, pump or
electric heater K, and circulation pump C.
Attention! In Scheme 19 the function will be active when T4 > 60C.
Yes / No No
Lock boiler K
with boiler C
A parameter only used in scheme no 14.
Switching on the” Lock boiler K with boiler C” function results in switching off the K boiler if the C fire place or solid-fuel boiler
operates.
Yes / No No
Min. time before pump
speed level increases
This parameter determines the time delay when changing to a higher rotation of solar panel pump.
Additionally, the parameter causes smooth operation of the solar installation with variable weather conditions and affects the
efficient use of solar energy especially on cloudy days.
10 – 300s 150s
Min. time before pump
speed level decrease
This parameter determines the time delay when changing to a lower rotation of solar panel pump.
Additionally, the parameter causes smooth operation of the solar system with variable weather conditions and affects the
efficient use of solar energy especially on cloudy days.
2 – 300s 10s
Pump speed level during
start-up
This parameter is available for the selected type of pump controlled with PWM signal (ST7PWM2) and determines the rotation of
the pump during its start-up. The pump operation is divided into 15 ranges.
1 – 15 1
Pressure switch This parameter defines the on and off function of the pressure control in the solar collectors by working with a pressure switch Yes / No No
Overheating protection
of the tank
A parameter used in schemes no 6, 14, 18. Switching protection off makes it possible to cool the lower part of the heater. When
temperature measured by the T2 sensor of parameter “MaxTemp. T2 OFF collector's pump” is exceeded, the solid-fuel boiler
pump will be switched on and the T2 sensor value will be blinking.
Yes / No No
Parameters of circulation pump (Circulation param.)
Switching on the
circulation pump
Option that makes it possible to enable / disable the circulation pump at the times set in “Time Program C” option. This option
refers to the schemes with connected tap water circulation pump only.
Yes / No Yes
Circulation pump
operation
mode
Circulation pump operation option. This option only refers to schemes which include tap water circulating pump.
It defines C circulating pump operation in the time set in “Time program C” option:
- Continuous - C circulating pump works in the continuous mode,
the C circulating pump operates in cycles
according to the work periods set
Continuous /
Discontinuous
Discontinuous
Min. temp. T4
switching on the
circulating pump
Parameter associated with the T4 sensor placed in the upper part of the heater. It determines the minimum water temperature in
the heater (T4) required to switch on the circulation pump. This parameter prevents the water heater from being completely
cooled down.
1085C 35C
Time of switching on the
circulating pump
Time of switching on the C circulation pump in a set cyclic mode according to the preset working times.
159min
10min
Time of switching off the
circulating pump
Time of switching off the C circulation pump in a set cyclic mode according to the preset working times.
159min
10min
Table 3. Controller parameter description
13. Error alarms and controller notifications
Temperature sensor error (check sensors for visual condition or for proper connection to the controller.)
The controller checks whether temperature sensors have been connected. If a temperature sensor gets damaged, a cable gets broken, a sensor gets disconnected, the controller will
raise sensor alarm. During an alarm all the outputs are disconnected. Moreover, when the controller displays the main screen, the alarm might be signaled by sound. In the alarm
mode it is possible to browse the menu, configure parameters or manually control external devices. Information on which sensor raises alarm is available on the main screen. Next to
the sensor marking, "Err” will be displayed instead of temperature. If the controller raises sensor alarm it should be checked whether the system has been assembled correctly, the
sensor have been correctly connected and whether the temperature sensor is not damaged. When a sensor that is not necessary for controlling is not connected to the controller, the
controller will not raise an alarm and the display will show dashes (- - - -) instead of temperature.
The exception is the T5 sensor – the missing T5 sensor in the selected diagram will show dashes ( - - - - ) and switch off the device related to the T5 sensor.
Too high temperature of the heat transfer fluid returning to solar collectors – (check pressure and passability of the solar system, eliminate air from the system, check the
collector pump)
In case of selecting the flow meter type as ELECTRONIC G-916, the controller is provided with return temperature control to prevent the flow meter from getting damaged by too high
temperature.
When the temperature of T3 reaches 85°C, the solar collector pump is switched off and the T3 sensor temperature value is blinking.
ATTENTION! In case the value of T3 drops to 83°C or below, the blinking and the circulation pump blockage stops automatically.
No information on flow from the G-916 electronic flow meter – (check the G916 flow meter for correct connection to the controller.)
The information that the electronic flow meter does not operate when the Measurement: Electr.G916 is enabled in the option Flow / rotameter: if the collector pump is switched on
and there is no pulse from the electronic flow meter for 5 minutes, the controller will display the following message once: NO INFORMATION ON FLOW FROM THE G-916
ELECTRONIC FLOW METER.
The message and the sound alarm are off after acceptance with the key or when pulses appear again. This information is always displayed once after the pump is switched on
again and when the lack of pulse condition exists for the above-mentioned time.
ATTENTION! The lack of flow will only display a message without interfering with the operation of the controller and devices connected to it.
Lack of required flow (check pressure and passability of the solar system, eliminate air from the system, check the collector pump).
The controller checks heat transfer fluid flow for solar collector`s pump P and K. Lack of flow is controlled in two steps:
I step – If collector pumps operate on top gear and the condition T1-T2 > 50°C for the P pump or T3-T2 > 50°C (scheme no 15 and 16) for the K pump is fulfilled for 10 minutes
– the controller generates a sound signal and displays the following message: LACK OF REQUIRED FLOW. CHECK AND ADJUST. After acceptance with the key, the
message disappears and the sound alarm is off.
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