TECH ST-408, Руководство пользователя, Страница: 24 / 28

ST-408 – user's manual
setting the time, correct operation of the weekly control is not possible.
IV.k) Pulse generator sensitivity
Using this setting, the sensitivity of the pulse generator knob may be
changed in the range between 1 and 3 (where 1 is the highest sensitivity).
IV.l) External temperature measurement
This parameter determines the averaging frequency of the temperatures
during measurement from the external sensor. The measurement is conducted
continuously and every 60 seconds is (factory) averaged and refreshed. The
available range of this setting is within 1 to 600 seconds.
IV.m) External sensor calibration
The external sensor calibration is made during the installation or
after a longer period of use of the regulator, if the external temperature
displayed differs from the actual one. Regulation range: -10 to + 10
O
C
with the accuracy to 0.1 O C.
V. Protections
To ensure the maximally safe and reliable operation, the regulator
has several protections. In the case of alarm, a sound signal is activated
and a relevant message is shown on the display.
To make the controller return to work, press
pulse generator.
In the alarm, manual work is possible, but it should be completely
ensured whether our activities will not result in damages.
The controller has the following alarm protections:
1. Temperature alarm - stops the valve temperature regulation and sets the
valve in the safest position. For floor valve - it is closing, and for CH valve it is
opening.
2. Alarm -
VALVE SENSOR - means an incorrect connection or lack of
connection of the valve sensor or its damage. It is a sensor strategic for valve
operation, therefore it should be replaced immediately.
3. Alarm -
RETURN SENSOR – alarm occurs, when the return protection
function is activated and the damage of this sensor takes place. The return
sensor should be then corrected or replaced.
There is a possibility of deactivating this alarm by switching off the return
protection function, but if a circulation does not have the protection against
boiling of water at the furnace, it may cause a permanent damage of the
furnace or a part of circulation.
4. Alarm -
WEATHER SENSOR - occurs, when external temperature sensor is
damaged. The alarm may be cancelled, when an undamaged sensor is
installed correctly. The alarm shall be activated, when valve operation mode is
different than "weather control " or "room control with weather control".
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