Temperature Alarm; Thermal Protection; Automatic Sensor Control; Protection Against Boiling Of Water In The Ch Boiler - Tech Controllers EU-800 PID User Manual

7.1 T
EMPERATURE ALARM
This protection is activated only in operation mode (when the CH boiler temperature is lower than the pre-set temperature value).
If the CH boiler temperature does not increase within the period of time defined by the user, an alarm is activated: the fan is
disabled and a sound signal is activated. The display shows the following message: Temperature not rising.
Press the pulser knob to deactivate the alarm. The controller will resume the previously selected operation mode.
7.2 T
HERMAL PROTECTION
The controller is equipped with a bimetallic mini-sensor (installed near the CH boiler temperature sensor or on the supply pipe,
as near the CH boiler as possible), which automatically disconnects the fan when the alarm temperature of 85÷90
It prevents the water in the system from boiling in case of CH boiler overheating or controller damage. After this protection has
been activated and the temperature has dropped to a safe level, the sensor automatically unlocks itself. When the sensor is
damaged or overheated, the fan is disabled.
NOTE
When this sensor is damaged, the fan is disabled in both manual and automatic mode.
7.3 A
UTOMATIC SENSOR CONTROL
If one of the temperature sensors (CH, DHW, screw feeder or fuel tank) is damaged, an alarm sound is activated and the display
informs about the failure; e.g. CH sensor damaged. The fan is disabled. The pump operates regardless of current temperature.
If the CH sensor is damaged, the alarm is active until a new sensor is installed. In the case of DHW sensor damage, the alarm
should be switched off by pressing pulser knob – the controller will restore operation with one pump (CH). A new sensor should
be installed so that all modes of CH boiler operation could be available.
7.4 P
ROTECTION AGAINST BOILING OF WATER IN THE CH BOILER
This protection applies only to water tank priority mode, in the case when the water tank is insufficiently heated. When the pre-
set temperature of the water boiler is 55
temperature), the controller disables the fan. If the CH boiler temperature still increases reaching 80
switched on. In the case of further temperature increase, an alarm will be activated at the temperature of 85
usually occurs when the water tank or the pump is damaged or when the sensor is incorrectly mounted. When the temperature
O
drops, at 60 C the controller enables the fan and it remains in operation mode until the temperature of 62
7.5 T
EMPERATURE PROTECTION
The regulator has an additional protection against hazardous temperature growth. If the alarm temperature of 80
the fan is disabled and the pumps are switched on in order to distribute hot water throughout the house installation. When the
O
temperature of 85 C is exceeded, an alarm is activated and the display shows the following alarm message: Temperature too
high. When the temperature drops to a safe level, press the pulser knob to deactivate the alarm and return to the previous
operation mode.
7.6 F
USE
The regulator has a WT 3,15A tube fuse-link protecting the network.
NOTE:
Higher amperage fuse should not be used as it may damage the controller.
O
C whereas the actual CH boiler temperature reaches 62
29
O
C is exceeded.
O
C (so called priority
O
C, the CH pump will be
O
C. Such a situation
O
C is reached.
O
C is exceeded,