ELECTRICAL CONNECTIONS
16
Fig 5.
Securing wire tips a) right, b) wrong
5.4.
Hydraulic function scheme
The presented hydraulic diagram does not replace the central heating system
design and it can be used for reference purposes only.
Brief description of the system functioning: after firing the boiler up, the central heating pump
is activated after the boiler exceeds the central heating pump activation temperature (service
parameter n0, by default n0=40°C). The hot utility water pump is activated when the tank
temperature (6) drops below the preset value. If at this time the preset boiler temperature is
lower than the preset hot utility water temperature, the regulator increases the preset boiler
temperature in order to fill the hot utility water tank.
After filling the hot utility water tank, the hot utility water pump can continue work for a preset
time, in order to collect heat from the boiler. After the room thermostat (5) operates, the
regulator decreases the preset boiler temperature and/or temporarily disables the central
heating pump (2).
Fitting an emission temperature sensor (8) in the boiler flue enables very fast detection of fuel
depletion and turns the fan off. Moreover, it allows operation in the PID- EMISSION boiler
regulation mode, and preview of the emission temperature.
Legend
1.
Regulator
2.
Central heating pump
3.
Hot utility water pump
4.
Fan
5.
Room thermostat
6.
Hot utility water tank
7.
Central heating system
8.
Chimmey duct
9.
Boiler
T1.
Boiler temperature sensor
T2.
Hot utility water
temperature sensor
T3.
Emission temperature
sensor (optional)
