House Heating; Boiler Tank Priority - TECH ST-450zPID User Manual

Manual operation module. In this function, each executive device (the feeder,
the blow-in, the CH pump, the HUW pump, the circulation pump and the floor
pump) is activated and deactivated independently of the others.
Pressing the pulse generato activates the engine of the chosen device.
This device remains activated until the pulse generator is pressed again.
The blow-in power, where the user has the possibility to set any rotational
speed of the fan in manual operation, is additionally available.
II.7. Operation mode
In this function, the user selects one of four options of the
boiler's operation.

House heating

▪
When you select this option the controller switches over to a mode where
heating is provided only to heat the central heating circuit. The central heating
pump begins to run above the pump activation temperature (factory set at
38 O C - see Section III.g). The pump will turn off below this temperature (minus
a hysteresis of 2°C).

Boiler tank priority

▪
In this mode, the boiler tank (hot water) pump will be switched on first to run
until the set-point temperature is reached (see Section II.e), after which the
ST – 450 z PID
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