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operation in the sustain cycle.
Boiler hysteresis
•
This option is used to set the hysteresis of the preset temperature. It is a
difference between the sustain cycle activation temperature and the
temperature to return to operation cycle (e.g. if the preset temperature is 60°C
with hysteresis equal to 3°C, switching to sustain mode is performed after the
temperature of 60°C is reached, and the device returns to operation cycle once
the temperature drops to 57°C).
Once the controller operation without PID is selected the following functions
(assigned to PID only) will disappear from the main and installation menus:
firing,
damping
boiler power,
air correction,
fuel type,
supervision mode.
III.20. Room controller
This function is used to define the type of the controller connected to ST-450 controller with PID and
programme the room controller operation:
a)
Off – no room controller connected
b)
Standard controller – two-state room controller
c)
TECH controller – controller with RS communication function.
d)
Room controller unit
Off – state of the room controller has no impact on other settings
•
Boiler – once the room controller indicates that the preset temperature has
•
been reached the temperature preset on the boiler will be reduced (detailed
settings see Item II.15)
Central heating pump - once the room controller indicates that the preset
•
temperature has been reached the central heating pump will be turned off
(detailed settings see Item II.15)
After TECH Controller or standard option is enabled a letter "P" appears in
•
the upper part of the display in the main screen of the controller. A flashing
letter "P" indicates that the temperature in the room is too low. As soon as the
required room temperature is reached the letter "P" stops flashing and stays on.
e)
Information about the programme – This function allows the user to
check the programme version of the TECH room controller connected.
III.21 Display contrast
Allows changing the display contrast settings.
IV. Service Menu
To access the servicing functions of the ST-450 controller you must enter
ST – 450 z PID
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