4Protections; Temperature Alarm; Thermal Protection; Automatic Sensor Control - Tech Controllers EU-48 User Manual

To access the servicing functions of the controller, enter a four-digit code. Such code is in pos-
session of the manufacturer of the boiler as well as the TECH company.
4 P
ROTECTIONS
To ensure maximally safe and unfailing operation, the regulator has a number of protections. In
the case of an alarm, a sound signal is activated and an appropriate message is shown on the display.
To make the controller return to operation, press the pulse generator.
4.1 T
EMPERATURE ALARM
This protection is activated only in the operation mode (that is when the boiler temperature is
lower than the set temperature). If the boiler temperature does not increase throughout the period set
by the user, the alarm is activated, the feeder and the blow-in are deactivated (the water pump is turned
on regardless of the boiler temperature) and a sound signal is activated. An appropriate message will be
shown on the display.
The alarm will be disabled after pressing the knob of the pulse generator. The regulator returns
to the recently set operation mode.
4.2 T
HERMAL PROTECTION
It is an additional bimetallic mini-sensor (located at the boiler temperature sensor), disconnecting
the fan and the feeder in the event of exceeding the alarm temperature: 85
the water in the installation from boiling , in the event when the boiler overheats or the controller is
damaged. After activation of this protection, when the temperature goes down to a safe value, the sensor
will unlock automatically and the alarm will be deactivated. In the case of damage or overheating of this
sensor, the fan the and feeder will be disconnected.
4.3 A
UTOMATIC SENSOR CONTROL
In the event of damage of each of the sensors the sound alarm is activated, additionally signalling
, the defect on the relevant display, e.g.: "CH sensor damaged". The feeder and the blow-in is disabled.
The pumps operate according to the set temperatures, regardless of alarms.
In the case of damage of the CH sensor or the feeder, the alarm will be active until the sensor is replaced
with a new one. If the HUW sensor is damaged, one should press the menu button, which will turn off
the alarm and the controller will return to the one pump (CH) operation mode. In order to ensure
that the boiler will be able to work in all modes, the sensor must be replaced with a new one.
4.4 P
ROTECTION AGAINST BOILING OF WATER IN THE BOILER
This protection is applies only to reboiler priority operation mode. When the set reboiler tem-
perature is e.g. . 55
called the priority temperature), then the controller will turn off and the feeder the fan. If the temperature
in the boiler still increases up to 80
increases, then the alarm will be activate at the temperature of 85
appear when the reboiler is damaged, the sensor is improperly fitted or the pump is damaged. However,
when the temperature drops, then at the threshold of 60
blow-in and will run in the operating mode until the temperature of 62
4.5 T
EMPERATURE PROTECTION
The regulator has an additional protection in the event of damage of the bimetallic sensor. After
exceeding the temperature of 85ºC, the alarm is activated, signalling the following on the display: "Tem-
perature too high". Despite damage of the bimetallic sensor, the controller receives information on the
current temperature in the boiler from the electronic sensor. In the case of exceeding the alarm temper-
ature, the fan is turned off and, at the same time, both pumps begin to operate in order to distribute hot
water across the house installation.
O C and the actual temperature in the boiler increases up to 62
O C, the CH pump will be activated. When the temperature still
O C. Most often such a condition may
O C the controller will turn on the feeder and the
O C is reached.
O C. Its activation prevents
O C (this is the so-