Tech Controllers EU-28N User Manual

15
7.3 AUTOMATIC 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 BOILER 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
O
C, and the actual temperature on the boiler rises to 62
O
C (this is the so-called priority temperature),
then the controller turns off the fan. If the temperature on the boiler rises to 80
O
C, the CH pump will switch on. When the
temperature continues to rise, an alarm will sound at 85
O
C. Most often, such a state can occur when the boiler is damaged, the
sensor is incorrectly fixed, or the pump is damaged. However, once the temperature decreases, at the 60
O
C threshold, the
controller will turn on the blower and will operate in the operating mode until the temperature reaches 62
O
C.
7.5 TEMPERATURE PROTECTION
The controller has additional mechanical protection against dangerous temperature increase. If the alarm temperature (80
O
C) is
exceeded, the fan is disconnected. When the temperature of 85
O
C is exceeded, an alarm is activated and a message appears on
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 FUSE
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 TECHNICAL 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
230V ±10% /50Hz
2
Max. power consumption
4.5W
3
Operation temperature
5÷50°C
4
Pump max. output load
0.5A
5
Fan max. output load
0.6A
6
Temperature measurement accuracy
±1°C
7
KTY sensor thermal resistance
-30÷99°C
8
Fuse
2x 3.15A

Tech Controllers EU-28N Specifications

General

Brand	Tech Controllers
Model	EU-28N
Category	Controller
Language	English