TECH ST-408, User Manual, Page: 19 / 28

Tech
moment in which room regulator gives the signal of room heat-up (contact
divergence). Then the preset temperature shall be reduced by the
temperature value set up according to
room regulator reduction parameter
(see chapter: IV.c.10). The reduced preset temperature will not be displayed
on the controller main screen. The information that the room regulator
indicated that the room is heated up is signaled by room regulator
symbol<p>(continuous display, not pulsating).
If TECH type room regulator is used, valve will work all the time
according to < change in the preset valve temperature> and according to
< difference in room temperatures > parameters (see chapter IV.c.8 and 9).
WEATHER CONTROL - the preset valve temperature depends on the
temperature outside. It is calculated on the basis of the functions stipulated in
Weather regulator (see chapter IV.c.7).
ROOM AND WEATHER CONTROL – this mode, in the case of standard (two-
state) application of room regulator and when room regulator does not reach
the preset temperature, the valve works just as in weather control. At the
time the room is heated up to the set regulator temperature, the valve starts
to work as in
room control mode (temperature decreases by " room regulator
reduction " parameter value). When this mode is active, weather control and
room control symbols pulsate alternately on a display. After reaching the
temperature preset by the controller, the symbol<p>(room regulator heated
up) will be displayed permanently.
If TECH type room regulator is used, valve will work all the time
according to " Weather regulator " calculations, however, the temperature
calculated in such a way will be corrected by the deviation value calculated
according to parameters:
according to < change the set valve temperature>
and according to < difference in room temperatures > parameters.
WEEKLY REGULATOR - the preset valve temperature depends on the value
deviations defined for particular weekdays in Chapter Weekly regulator (see
chapter: IV.c.16). Room control or weather control is not active in this mode.
The active weekly control is indicated by the current temperature deviation
value pulsating on the main screen (at the place of"
preset text).
IV.e.15) Pump activation
This option allows to select the working mode of a pump. A pump shall
be activated: always (pump works all the time, regardless of temperatures),
never (pump is permanently deactivated and only valve work is controlled by
the regulator), above the threshold (the pump is switched on above the
preset activation temperature ). If pump is to be activated above the
threshold, the threshold temperature of pump activation should be also
preset.
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