Tech Controllers EU-28N User Manual page 15

7.3 A
UTOMATIC SENSOR CONTROL
If the CH, DHW or screw temperature sensor or fuel reservoir is damaged, an audible alarm is activated, additionally signalling the
relevant fault on the display, e.g.: "CH sensor damaged". The blower is switched off. The pump operates independently of the
current temperature.
7.4 B
OILER BOILING WATER PROTECTION
This protection applies only to the boiler priority operating mode, in case the tank is underheated. Namely, when the boiler
temperature is set, e.g.: 55
then the controller turns off the fan. If the temperature on the boiler rises to 80
temperature continues to rise, an alarm will sound at 85
sensor is incorrectly fixed, or the pump is damaged. However, once the temperature decreases, at the 60
controller will turn on the blower and will operate in the operating mode until the temperature reaches 62
7.5 T
EMPERATURE PROTECTION
The controller has additional mechanical protection against dangerous temperature increase. If the alarm temperature (80
exceeded, the fan is disconnected. When the temperature of 85
the display reading: "Temperature too high". Once the temperature drops to a safe value, after pressing the OPTIONS button, the
alarm will be turned off and the controller will return to the last set operating mode.
7.6 F
USE
The controller has a 3.15A WT glass tube fuse insert, which protects the network.
CAUTION:
Using a higher rating fuse may cause damage to the controller.
8 T
ECHNICAL SPECIFICATIONS
In the EU-28N controller, one should check the technical condition of the wiring before and during the heating season. Also check
the mounting of the controller, clean it from dust and soiling, and measure the grounding of the motors (CH pump, DHW pump,
blower).
No. Specification
1 Power supply
2 Max. power consumption
3 Operation temperature
4 Pump max. output load
5 Fan max. output load
6 Temperature measurement accuracy
7 KTY sensor thermal resistance
8 Fuse
O
C, and the actual temperature on the boiler rises to 62
O
C. Most often, such a state can occur when the boiler is damaged, the
O
C is exceeded, an alarm is activated and a message appears on
15
O
C (this is the so-called priority temperature),
O
C, the CH pump will switch on. When the
O
C.
230V ±10% /50Hz
4.5W
5÷50°C
0.5A
0.6A
±1°C
-30÷99°C
2x 3.15A
O
C threshold, the
O
C) is