Parallel Pumps; V.l) Room Regulator; V.m) Language; V.k.4) Summer Mode - Tech Controllers ST-81 User Manual

User's manual
In this mode, when the boiler is still insufficiently heated, the fan's operation is limited to a
temperature of 62°C on the boiler because this prevents the boiler from overheating.
The DHW priority function consists in heating first the hot utility water and then heating up the water
in the radiators.
In this mode, the main screen, next to the temperatures on the right-hand side of the display, shows
the symbol
NOTE
The boiler should be equipped with return valves on the circulations of CH and DHW pumps. The valve
fitted on the DHW pumps prevents hot water from being sucked out of the boiler. The valve fitted to
the circulation of the CH pump never lets through hot water which heats the boiler to the house.
V.k.3) Parallel Pumps
In this mode, the pumps' operation starts simultaneously
below the pre-set temperature (see, Function Pump Activation
Temperature). The CH Pump operates continuously, and the
DHW Pump is switched off after reaching the pre-set
temperature on the boiler. In this mode, on the main screen
next to the temperatures on the right-hand side of the display, shows the symbol

V.k.4) Summer Mode

After activating this function, the CH pump is switched off and
the DHW pump is switched on above the pump activation
threshold. After exceeding the threshold temperature, the
DHW pump operates continuously until the boiler temperature
drops below the pump activation threshold (by the DHW
hysteresis value). In the summer mode, only the pre-set temperature of the boiler is defined,
additionally operates as the boiler's pre-set value. After activating the summer mode, the main screen
will show the symbol *.
Room Regulator
V.l)
The room regulator is connected to the controller with the use
of a two-core cable via the connection socket marked as ROOM
REGULATOR. After the correct connection with the boiler
controller, the user should activate its activity in the controller's
menu.
The principle of the room regulator's operation is based on disconnecting the contacts of cables
leading to it when the pre-set temperature in the room is reached. If the boiler's controller receives a
signal about room heat-up, it automatically proceeds to the support mode, regardless of the boiler's
pre-set temperature.
Note. If the pre-set temperature on the controller fitted on the boiler is too low, the room regulator
may not reach the pre-set temperature in the apartment.
After activating the option Room Regulator with the boiler's controller, the main screen in the
upper part of the display will show the letter<p>If the letter is pulsating, this proves that the room is
heated insufficiently (the room's regulator pre-set temperature is not reached). When<p>is displayed
continuously, the pre-set room temperature has been reached (heated room).
NOTE
No external power supply may be connected to the room regulator's input.
Language *
V.m)
In this function, the user may change the language version of
the controller's software.
* Function active in certain software versions.
10

Parallel pumps

Summer mode
.
Parallel pumps
Summer mode
Operat mode
Room regulat.
Polski
English