Controller Functions - Main Menu; V.a) Block Diagram - Main Menu - Tech Controllers ST-979 User Manual

ST-979 user's manual
Modulation operation algorithm:
After successful fire-up the controller switches to modulation mode. It consists of 3 stages
depending on current temperature.
1. 100% modulation
In this stage the fan and the feeder operate according to user's settings - Main menu / Modulation
settings / 100% modulation. The controller switches to the next modulation stage when the CH
boiler reaches the pre-defined value - Main menu / Modulation settings / 100% modulation /
Range from set temp.
2. 60% modulation
In this stage the fan and the feeder operate according to user's settings - Main menu / Modulation
settings / 60% modulation. The controller switches to the next modulation stage when the CH
boiler reaches the pre-defined value - Main menu / Modulation settings / 60% modulation / Range
from set temp.
3. 30% modulation
It is the last modulation stage. Its aim is to maintain the pre-set CH boiler temperature. The fan
and the feeder operate according to user's settings - Main menu / Modulation settings / 30%
modulation.
Damping
Damping process is independent of the current operation algorithm. It may be activated by the
user in the main menu or by the software in certain circumstances (e.g. before automatic cleaning
procedure or after a sudden temperature increase of 5⁰C).
Damping process consists of two stages whose duration time may be adjusted by the user - Fitter's
menu / CH boiler settings / Damping parameters:
1. Damping protection
The first stage involves damping protection when the feeder is disabled and the fan speed is
adjusted by the user - Fitter's menu / CH boiler settings / Damping parameters.
2. Damping delay
Once the delay time elapses, the fan starts operating at full speed for a certain period of time. It
is the damping delay stage.
Controller functions – main menu
V.
Due to multiple functions fulfilled by the controller, the menu is divided into Main menu and Fitter's
menu.
The main menu includes basic options such as parameters of built-in valves and pumps,
operation modes, time setting, screen view settings etc.
V.a) Block diagram - Main menu
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