Function; Prompts; Heating Circuit - ENGO CONTROLS EWT100 Operation And Installation Manual

11. Function

11.1 Prompts

The controller reports on the main screen prompts alarm indicating the status of the controller and damage the sensors, so that the user can take
appropriate steps to eliminate damage or preventing a hazardous situation. Reported by the controller prompts are: 1. Damage heating circuit sensor
temperature. 2. Damage sensor external temperature. 3. Damage sensor return temperature. 4. Damage sensor heat source temperature. 5. Frost
protection active!. 6. Cooling boiler!.

11.2 Heating circuit

Settings for heating circuit without weather sensor.
Should disable the external temperature sensor in the External sensor from the service menu and then It is necessary to manually set the required
water temperature in the heating mixer circuit using parameter Preset mixer temp., e.g. at a value of 50°C. The value should allow to obtain the
required room temperature. After connecting room thermostat, it is necessary to set a value of decrease in preset temperature by thermostat
(parameters Decrease of thermostat) e.g. at 5°C. This value should be selected by trial and error. The room thermostat can be a traditional thermostat
(No-Nc). Upon activation of the thermostat, the preset mixer circuit temperature will be decreased, which, if proper decrease value is selected, will
stop growth of temperature in the heated room.
Settings for heating circuit with weather sensor.
Shouldn't disable the external temperature sensor in the External sensor from the service menu. Using parameter Curve parallel move, set preset
room temperature following the formula: Preset room temperature = 20°C + Curve parallel move. In this setup, it is possible to connect a room
thermostat which will equalize the inaccuracy of selecting heating curve, if the selected heating curve value is too high. In such case, it is necessary
to set the value of parameter Decrease by thermostat, e.g. at 2°C. After opening of the thermostat contacts, the preset mixer circuit temperature will
be decreased, which, if proper decrease value is selected, will stop growth of temperature in the heated room.
Weather control.
For the heating circuit can be turned on weather control, which requires
the connection of external temperature sensor. It should enable the
external temperature sensor by setting:
Service settings —> External sensor = ON - cause additional menu
Weather control.
The heating circuit water preset temperature is calculated basing on the
temperature prevailing outside the building. The colder it is outside, the
higher water temperature in the heating circuit is. This relation is shown in
the controller in the form of heating curve.
The heating curve can be changed in a graph from the system menu, within the range for the weather preset temperature. It is a reflection of the
thermal characteristics of the building. If the building is less insulated then the heating curve should be greater. Heating curve should be selected
experimentally by changing it in a few day intervals. During trial and error selection of appropriate heating curve, it is necessary to exclude influence
of the room thermostat on regulator operation (regardless of whether the room thermostat is connected or not), by setting the parameter:
Service settings —> Room thermostat = OFF.
EWT100 FULL MANUAL 21