Vi.j) Emergency Ch Pump Activatio; Vi.k) Alarm Temperature; Vi.l) Blow Gear; Vi.m) Ch Pump Room - Tech Controllers ST-81 User Manual

Emergency CH Pump Activatio
VI.j)
This option is active only in the boilers priority and summer
modes. This setting enables the user to define the emergency
temperature when the CH pump is activated in order to
distribute hot water in the system. Range of settings: 65-80°C
(factory value - 80⁰C).
Alarm Temperature
VI.k)
It is the temperature which, when exceeded, activates the
sound alarm, displaying the message "TEMP ZA DUŻA" on the
LCD. If the emergency temperature is exceeded, the fan is
switched off permanently (both pumps operate). Range of
settings: 70-95⁰C (factory value - 85⁰C).
Blow Gear
VI.l)
This option is used to define the initial fan speed during its
start-up, namely the gear from which it will start. Range of
settings: 1-100%.
CH Pump Room
VI.m)
This function is active only in cooperation with the room
regulator. If the function is activated, the CH pump operates
continuously above its activation temperature. If the function
is deactivated, then the pump is switched off after the room
heats up (signal from the room regulator). The CH will be
switched on again when the room regulator reports insufficient heating.

VII. Protections

To ensure the maximum safe and unfailing operation, the regulator is equipped with a number of
protections. In the case of alarm, a sound signal is activated and a relevant message is shown on the
display with the information about the type of error.
In order for the controller to return to operation, the user should press the OPTIONS button.
In the case of alarm CH pump temperature too high, the user should wait a while for this temperature
to decrease below the alarm threshold.
Thermal Protection
VII.a)
It is an additional bimetallic sensor (thermal overload relay) located near the boiler's sensor (in the
capillary or on the pipe feeding the CH circulation) which mechanically disconnects the fan's power
supply after reaching the temperature of approx. 85°C (the CH pump operates continuously). This
prevents the water in the system from boiling if the boiler is overheated or if the regulator is damaged.
After this protection is activated, when the temperature drops to a safe value, the sensor automatically
unlocks and the alarm is deactivated. In the case of damage to the thermal overload relay, the fan
does not work both in manual operation and in automatic operation.
Automatic Sensor Control
VII.b)
If the CH and DHW sensor is damaged , an alarm is activated,
additionally signalling the defect on the display, e.g:
The airflow is switched off and both pumps start operating simultaneously regardless of the
temperature.
Emerg CH pump act
Alarm temperat.
Blow gear
Blow gear
Alarm
CHsensor damaged
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ST-81 v 81.035
78⁰C
90⁰C
100%
CH pump roomreg