Tech Controllers EU-88 zPID User Manual page 5

I. Description
Blow
Blow
C.H. Pump
The ST–88zPID temperature regulator is intended for use with central heating boilers.
The regulator is used for controlling the central heating water circulation pump, hot
consumption water pump and blow (fan).
The EU-88zPID is a PID-basedcontroller using a continuous signal. In this type
of controllers, the fan power is calculated based on boiler temperature and flue gas
temperature measured at the boiler outlet. The fan runs continuously and its power
depends directly on the measured boiler temperature and flue gas temperature as well
as the difference between the two parameters and their setpoint values. Advantages of
zPID regulators include their ability to maintain a stable setpoint temperature without
unnecessary overregulations and oscillations.
By fitting the controller with a flue gas outlet sensor, you can save
up to several percent of fuel, and ensure a steady water temperature for a longer service
life of your heat exchanger (boiler). Flue gas outlet temperature monitoring ensures
reduced harmful dust and gas emissions. The thermal energy from the flue gases is
used for heating instead of being wasted and disposed of through the funnel.
Research results presented below were obtained using the Tech PID-based
controller:
Manual Mode
H.C.W. Pump
Encoder knob
from a few
5