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After choosing the proper heating curve, the circuit preset temperature is calculated according to the outside temperature. As a result if the heating
curve is appropriate for 25 the building, the room temperature remains constant regardless of the temperature outside. Guidelines for selecting a
proper heating curve: - if at dropping external temperature, room temperature increases, the selected heating curve is too high, - if at dropping
external temperature, room temperature also drops, the selected heating curve is too low, - if during frost, room temperature is proper and too
low when the weather is warmer, it is recommended to increase heating curve parallel shift and decrease the heating curve, - if during frost, room
temperature is too low and too high when the weather is warmer, it is recommended to decrease heating curve parallel shift and increase the heating
curve. Poorly warmed buildings require setting higher heating curves. Whereas for well heating buildings, heating curve will have a smaller value.
The regulator can increase or decrease the preset temperature, calculated in accordance with the heating curve, if it exceeds the temperature range
for the given circuit set in parameters Min. temperature and Max. temperature.
11.3 Frost protection
Frost protection function is applicable only to active controller work modes: OFF or AUTOECO. In AUTO-ECO mode, this function is executed only during
a night time decrease. The function is activated in the menu:
Services settings —> Protection = Frost protection
Description of frost protection against the external temperature sensor readings.
When the external temperature drops below 3°C, an Frost protection delay, e.g. 4h must expire. If after this time the external temperature is still
under 3°C, a heating circuit pump will be activated for 30 minutes. After 30 minutes temperature on the mixer sensor will be checked and if the
temperature is lower than 13°C to preset temperature heat source is set to Frost protection temp. value. Turning off the pump and the heat source will
take place only after the external temperature rises above 3°C. The pump circuit is also activated when there is a risk of freezing circuit.
Adjustable circuit.
When the external temperature drops below 3°C, an Frost protection delay, e.g. 4h must expire. If after that time the external temperature does not
rise above 3°C the heating circuit pump will turn on for the duration of 15 minutes. After 15 minutes, water temperature in the circuit will be checked.
If it is higher than 13 °C, the pump will be stopped. If it is lower than 13 °C, the pump will continue its operation and heating circuit will be heated by
a heat source up to a Frost protection temp. value. The pump will be stopped unless the external temperature exceeds 3°C. If the heating circuit must
be turned on during this period, instead of off the controller must be activated for the heating circuit working mode: OFF or AUTO-ECO.
During a risk of frost, do not connect the controller from the mains supply.
11.4 Power stoppage
In case of power stoppage the controller returns to operation mode in which it was before stoppage.
11.5 Prevention cooling
The function tries to cool down the heat source before switching the regulator into the alarm state of overheat of the heat
source.
11.6 Pump anti standstill function
The controller performs the function of protecting pump from anti standstill. It involves the periodic switching (which 167h
for a few seconds). This protects the pump against immobilization due to scaling. Therefore, during a break in the use of the
controller, the controller power supply should be connected.
11.7 Fuse replacement
Cut off power supply to the controller before fuse replacement. Use 1.25A time-delay subminiature fuse with minimum
interrupting current of 100A should be used, as per IEC 60127 standard. To replace open controller's enclosure and replace
burnt fuse with a new one.
12. Storage and transport conditions
The controller cannot be exposed to immediate effects of atmospheric conditions i.e. rain or sunrays. Temperature of storage
should be within scope 0...65ºC.
EWT100 FULL MANUAL
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