Pump Switch-On Temperature; Dhw Hysteresis; Disinfection Of The Boiler; Anti-Stop For Pumps - Tech Controllers EU-28N User Manual

6.3 P -
UMP SWITCH ON TEMPERATURE
This option is used to set the switch-on temperature of the pumps (this is the temperature measured on the boiler). Below the
set temperature, the pumps do not operate, and above this temperature, the pumps are switched on, but operate depending on
the mode of operation.
6.4 DHW
HYSTERESIS
This option is used to set the boiler set point hysteresis. This is the difference between the set temperature (i.e. the desired
temperature on the boiler) and the return to operation temperature (for example: when the set temperature is 55°C and
hysteresis is 5°C, then once the set temperature is reached, i.e. 55°C, the DHW pump switches off. The DHW pump will be switched
on again after the temperature has dropped to 50°C).
Example:
When the preset temperature is 55°C and the hysteresis is 5°C, the device will be switched off when the temperature
reaches 55°C, while the return to the operating cycle will occur when the temperature drops to 50°C).
6.5 D
ISINFECTION OF THE BOILER
Thermal disinfection consists in raising the temperature to the required disinfection temperature of min. 60°C it the entire DHW
circuit. The new regulations impose the obligation to adapt the DHW installation to periodic thermal disinfection carried out at a
water temperature not lower than 60°C (the recommended temperature is 70°). Wires, fittings and technological system of hot
water preparation must meet this condition.
Disinfection of DHW is aimed at eliminating Legionella pneumophila bacteria, which cause a decrease in the cellular immunity of
the body. This bacterium often multiplies in vessels with standing hot water (optimum temperature 35°C), which often takes place,
for example, in boilers.
When this function is activated (only possible in Boiler Priority mode), the boiler heats up to 70°C (factory setting) and maintains
this temperature for 10 minutes (factory setting) and then returns to normal operation mode.
From the moment of disinfection, the temperature of 70°C must be reached for not more than 60 minutes (factory setting),
otherwise this function will automatically deactivate.
6.6 A -
NTI STOP FOR PUMPS
After enabling this option, the pump will switch on depending on the user's settings every 1-20 days for a set time (min. 30, max.
180 seconds). This prevents water from fouling the installation outside the heating season.
6.7 A
NTIFREEZE TEMPERATURE
This option allows you to enable the antifreeze function, which is designed to protect the installation against freezing. After the
temperature on the boiler or tank sensor drops below the specified value, the pump is switched on permanently. Its shutdown
will only occur once the temperature in the circuit rises.
DHW set temperature
Hysteresis
Pump shutdown
Switching the pump on again
13
55°C
5°C
55°C
50°C