TECH ST-81 User manual

ST-81 – USER'S MANUAL
TECH
Declaration of conformity no 23/2007
We, company Tech, ul. St. Batorego 14, 34-120
Andrychów declare with ull responsibility that ST-81, 230
V, 50 Hz thermo regulator that we manu acture meets the
requirements o Ordinance o the Minister o Economy
(Dz.U. Nr 155, poz. 108) rom 21st August 2007 which
implements LVD 2006/95/EC rom 16.01.2007 into Polish
law. ST-81 controller has passed EMC compati ility
test with optimal loads.
For assessment o con ormity harmonized standards
PN-EN 60730-2-9:2006 have been used.
Co-owners:
Paweł Jura, Janusz Master
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TECH
CAUTION!
ELECTRICAL EQUIPMENT UNDER VOLTAGE!
Be ore starting any actions concerning
montage (connection o cables to the
pump, installation o the device etc.) it is
essential to make sure that the thermo
regulator is not powered!
All connection works must only be carried
out by quali ied electricians.
Be ore activating the controller, measure
the motor resetting e iciency, check the
boiler and inspect wire insulation.
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Przycisk MINUS
Przycisk powrotu
z menu,
anulowania
ustawień
Przycisk wejścia
do podmenu,
zatwierdzania
ustawień
Przycisk PLUS
Nadmuch
Pompa OPompa WU Praca ręczna Wyłącznik
sieciowy

TECH
I. Description
ST–81 thermo regulator is designed or controlling CH boilers. It is
regulating the pump responsible or CH water circulation, HCW pump and
the blow ( an).
The main advantage o this thermo regulator is the simplicity o its
operation. The user is able to change all the parameters by the means o
knob o the pulse generator. Another advantage is a large and easily
readable graphic display which allows the user to precisely inspect the
actual status o the boiler operation.
All remarks on the software should e forwarded to the
manufacturer of the oiler.
Each thermo regulator should be set up in accordance with
specific needs, basing on the type of fuel used and the type of the
boiler. TECH does not take any responsibility for incorrect set up
of the thermo regulator
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Button PLUS
Button MINUS
Entering menu
and approving
settings
Power switch
Exit, cancelling
settings
Manual
operation
H W pump
H pump
Blow

ST-81 – USER'S MANUAL
I.a) Basic Terms
Fire up – The cycle begins when you activate the fire up unction in the
controller's menu and is active until the central heating boiler
temperature reaches 40oC (the de ault fire-up threshold), on condition
that the temperature does not drop below this value or 2 minutes (the
de ault fire-up time). I these conditions are met, the regulator will
switch to the operation mode and the manual operation symbol on the
housing will be deactivated. I the controller ails to reach parameters
required or entering into the operation mode within 30 minutes rom
activation o the fire-up unction, the "Unable to fire up" message will
appear on the display. In such a case, the ire-up cycle needs to be
restarted
Operation– The operation cycle is the basic unctionality o the
regulator, in which the Power o the blow is regulated by the user. I the
temperature rises above the set temperature a so called suspension
mode will be activated.
uspension mode – this mode will be activated automatically i the
temperature is equal or higher than the set temperature. In that case, in
order to ensure smooth decrease o temperature o circulating water it is
necessary to properly set operation times o the an.
Damping – i boiler temperature drops by 2oC below the fire-up
threshold and ails to rise above this value or 60 minutes (de ault
damping time), the regulator will switch to the damping mode. While in
this mode, the an is deactivated and the display shows "Damping".
In case o voltage loss, the regulator ceases to operate. When power is
restored, the controller returns to operation with previously set
parameters using its built-in memory.
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TECH
II. Functionality of the regulator
This chapter describes the unctionality o the thermo regulator,
means o changing the settings and moving around in the menu.
II.a) Main Page
During normal operation o the thermo regulator (in only CH mode)
the LCD display shows the main page which presents the ollowing
in ormation:
●Boiler temperature (on the left side of the display)
●et temperature (on the right side of the boiler)
● Symbol o non-operating an (*)
●Symbol o current operations mode or symbol o an active room
regulator.
This screen allows or quick change o the set temperature, by the means
o PLUS and MINUS buttons. Pressing down OPTIONS moves the user to
the 1st level menu, the display then shows the irst two rows o the
menu. In each menu the user can move up and down by the means o
PLUS and MINUS buttons. Pressing down OPTIONS moves the user to the
consecutive menu or enables a speci ic unction. EXIT moves the user
back to the root menu.
II.b) Fire up
This unction starts up the an during ire up sequence. In the case
that the boiler reaches the temperature higher than 40 degrees but it will
not reach the set temperature this button acts as a START/STOP, the
display will show Start/Stop an instead o ire up. I the an is not
operating, a star symbol will appear in the upper right corner o the
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53 Oc | 55 Oc *
CH set B

ST-81 – USER'S MANUAL
display. This unction allows the user to sa ely operate the boiler. I the
an is turned on it is orbidden to open the urnace door. This setting
allows to temporarily switch o the an at any time e.g. during eeding
uel.
I , during ire up sequence the boiler will not reach 40 degrees (de ault
damping threshold) during 30 minutes the display will present the
ollowing alarm:
In this case the user should restart the ire up sequence – the thermo
regulator will once again start the ire up sequence.
II.c) Manual operation
In order to increase the Com ort o the user the thermo regulator is
itted with manual operation mode. In this mode each executive element
can be switched o and on independently rom all the other elements.
Pressing down OPTIONS starts the fan, which remains turned on until the next
pressing of the OPTIONS button.
Pressing down OPTIONS Turns on/ off C water pump.
Naciśnięcie OPCJE załącza / wyłącza pompę C.W.U. (bojlera).
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33 Oc | 55 Oc
Unable to fire up
53 Oc | 55 Oc *
CH set B
Blow force
Blow
Blow
CH PUMP
CH PUMP
HCW pump

TECH
Naciśnięcie OPCJE załącza / wyłącza alarm.
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ST-81 – USER'S MANUAL
II.d) Pumps (CH and HCW) switch on temperature
This option is used in order to set the switch on temperature o the
CH and HCW pump (it is measured in the boiler). I the temperature
increase above the set level the pumps will switch on. The pumps will
switch o a ter the temperature drops below the set temperature (minus
2 degrees o hysteresis), in this case the pump will switch when the
temperature in boiler drops below 33 degrees.
II.e) Hysteresis of the boiler
This option can be used to set the hysteresis o the set temperature.
It is the di erence between the temperature o start o the suspension
mode and the temperature o restarting the operation mode (e.g. when
value o the set temperature is 60ºC and hysteresis is 2ºC, the start o
the suspension mode will take place at 60ºC, whereas the restart o the
operation mode will take place at 58ºC. Hysteresis can be set in the
range between 2ºC and 6ºC.
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HCW PUMP
alarm
42 Oc | 55 Oc *
CH et D
Manual operation
Pumps switchon temp
35oc
Pumps switchon temp
62oc 72oc
CH temp. set Pump switchon temp.
2oc
hysteresis

TECH
II.f) HCW hysteresis
This option can be used to set the value o the hysteresis o the
boiler set temperature. It is the di erence between the set temperature
(that is the boiler required temperature) and the actual boiler
temperature (e.g. i the set temperature has the value o 55ºC, and the
hysteresis is 5ºC. A ter the set temperature (55ºC) is reached the HCW
pump will switch o and the CH pump will switch on. The HCW pump will
restart i the temperature decreases to 50ºC.
II.g) Blow force
This unction allows to choose the operations speed o the an.
Range o regulations is between 1 and 10 (one can assume those are the
gears o the an). The higher the gear the aster the operation o the an,
whereas gear 1 is the minimal speed and gear 10 is the maximal speed.
Change o gears is being done by the means o PLUS and MINUS buttons.
The an always starts up with the maximal speed which allows it to start
operation even with some amount o dust present in the engine.
II.h) Modes of operation
This unction allows the user to choose one o our di erent modes o
operation.
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Boiler hysteresis
HCW hysteresis
HCW hysteresis
Blow force
62oc 72oc
CH temp set
5oc
hysteresis
62oc 72oc
CH temp et
5 gear
Blow force

ST-81 – USER'S MANUAL
A proper symbol or each operation mode is shown in the lower, right
corner o the display. Depending on the mode o operation a speci ic
letter is displayed:
D ( ) – house heating, B ( ) – boiler priority,
R ( ) – paralel pumps, L ( ) – summer mode.
II.h.1) House heating
I you select this option, the regulator will switch to the house
heating mode. The central heating pump starts to run above the pump
activation temperature (set to 35OC by de ault). Below this temperature
(minus central heating hysteresis o 2OC), the pump is shut o . While in
the house heating mode, the letter D is displayed in the bottom right
corner o the main screen.
II.h.2) HCW priority
Activating the hot consumption water priority will cause the
regulator to switch into the water heater priority mode. In this mode,
the (hot consumption water) heater pump is activated until the set
H.C.W. temperature is reached. Then, the H.C.W. pump is shut o and
the C.H. pump is activated. The central heating pump will run until the
water heater temperature drops below the set point value (and the
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House Heating *
H.C.W. Priority
42 Oc | 55 Oc *
CH et D
House Heating
H.C.W. Priority *
23Oc 23Oc 50oc *
CH HCW et B
HCW pump temp
Modes of oper.
42 Oc | 55 Oc *
CH et D

TECH
H.C.W. hysteresis); then, the C.H. pump is shut o and the H.C.W. pump
is activated.
In this mode, the an is operated as long as the temperature is
below 62°C to prevent the boiler rom overheating.
The hot consumption water priority unction consists in that the
consumption water is heated up be ore heating up water in radiators.
Change o the set HCW temperature can be done by pressing
button (holding down or a ew seconds). The display will show
the HCW temperatures screen or a ew moments.
Set temperature can changed with buttons .
A ter ew seconds the display will return to its previous state.
When HCW priority mode is on the main the letter B is show in the lower
right corner o the display.
ATTENTION: The boiler should have non-return valves mounted on
the central heating pump circuit and the hot consumption water pump
circuit. A valve mounted on the hot consumption water pump will prevent
hot consumption water rom being drawn rom the water heater.
II.h.3) Parallel Pumps
In this mode, the pumps start to run in parallel above the pump
activation temperature (set by de ault to 35OC). The central heating
pump runs continuously, while the hot consumption water pump stops
a ter the set point temperature is reached in the boiler; it then restarts
when the temperature drops by 2OC.
Change o the set HCW temperature can be done by pressing
button (holding down or a ew seconds). The display will show
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H.C.W. Priority
Parallel Pumps *
42 Oc | 55 Oc *
CH et R

ST-81 – USER'S MANUAL
the HCW temperatures screen or a ew moments.
Set temperature can changed with buttons .
A ter ew seconds the display will return to its previous state.
ATTENTION: In this mode, a non-return valve should be itted to
maintain di erent temperatures in the water heater and in the house.
A ter activation o the parallel pumps unction, three items appear on the
display. Starting rom the le t, these are: Boiler Temperature (C.H.);
Water Heater Temperature (H.C.W.) and Set point Temperature (C.H.).
When parallel pumps mode is on the letter R is show in the lower right
corner o the display.
II.h.4) Summer Mode
When the unction is enabled, only the hot consumption water pump is
running in order to heat water in the water heater. The pump is switched
on above a prede ined activation threshold (see the pump activation
temperature unction) and will run until the set point temperature has
been reached. The pump will start again when the temperature drops
below the set hysteresis. In the Summer Mode, only the set point
temperature is set on the boiler that heats up water or the water heater
(the temperature set or the boiler is also the temperature set or the
water heater).While in the Summer ode, the letter L is displayed in the
bottom right corner o the main screen.
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Parallel Pumps
ummer Mode *
45 Oc 43 Oc 55 Oc *
C.H. H.C.W. et L

TECH
II.i) Room regulator
ST-81 thermo regulator allows a room regulator to be connected in
the system. In this mode the thermo regulator is being controlled by the
room regulator and does not take into account the temperature set on
thermo regulator main unit. Blow is operating until the temperature set
on the room regulator is reached. However the operation o the boiler is
limited by the temperature set on the thermo regulator mounted on the
boiler.
CONNECTION OF THE ROOM REGULATOR: there is a 2-lead cable
coming out o the room regulator which should be connected to the
montage slit o the thermo regulator in the position described as “room
regulator”.
ATTENTION: no external voltage can be connected to the room
regulator
II.j) uspension operation
This option allows the user to set the time o operations o the an
(blow) in the suspension mode (above the set temperature).
II.k) uspension pause
This option allows the user to set the time o the pause in the an
operation during the suspension in order to prevent the boiler burn out,
in case when the temperature will hold over the set point value.
ATTENTION: Improper setting o this option may cause a constant rise
o the temperature! Suspension pause shouldn’t be too short.
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62oc 72oc
CH temp et Operation mode
Room regulator
ON
OFF

ST-81 – USER'S MANUAL
II.l) Language
This unction allows the user to change the language version o the
thermo regulator
II.m) Factory settings
The thermo regulator is preset or operation. However it is
necessary to adjust it to one’s speci ic needs. There is always the
possibility o returning it to actory (de ault) settings. Switching on this
unction will cause the user to lose all personal device settings which will
be replaced by the settings saved by the manu acturer (this does not
apply to settings o the service menu). At this point it is possible to re-set
personal settings o the controller.
III. Safeguards
In order to ensure a sa e and aultless operation, the regulator has
been provided with numerous protections. In the case o an alarm, an
acoustic warning is sounded and the display shows a corresponding
message.
Press OPTIONS to restore the controller to operation. In the case o
the C.H. Temperature Too High alarm, wait until the temperature
drops below the alarm value.
III.a) Thermal protection
The boiler is protected with an additional bimetal sensor (located at the
boiler temperature sensor) that disables the an when the temperature
exceeds the critical value: 85OC. This is to prevent water rom boiling in
the system when the boiler has been overheated or the controller is
damaged. When the protective unction is enabled and the temperature
drops to a sa e value, the sensor will automatically restart the device and
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23Oc 23Oc 50oc
CH HCW et uspension pause
Language choice
Polski *
English
23Oc 23Oc 50oc
CH HCW set
Const. CH pump
Factory settings
Yes
No

TECH
the alarm will be deactivated. I the sensor is damaged or overheated,
the an is disabled.
III.b) Automatic sensor check
In case when the CH temperature sensor is missing or damaged an
alarm is activated, which additional reports the ault on the display e.g.:
The blow is being turned off, whereas C and CW pumps are operating
independently from the current temperature, each in accordance with its specific
settings. In case of C sensor damage, the alarm will remain active until the sensor
is replaced. If the CW sensor is damaged, the user should press OPTIONS which
will turn off the alarm and the thermo regulator will return to one pump operation
(house heating). In order for the boiler to operate in all modes the sensor needs to
be replaced.
III.c) Temperature protection
The regulator eatures an additional protection in case the bimetal
sensor is damaged. A ter the temperature exceeds 85OC, the alarm is
sounded with the display showing the ollowing message:
The current temperature is read rom an electronic sensor and
processed by the thermo regulator. When the alarm temperature is
exceeded, the an is shut o and both pumps begin to run in order to
distribute hot consumption water throughout the system.
III. d) Anti-boil protection
This protective unction is used only with the water heater priority
mode. For example, when the water heater setpoint temperature is 55OC
and the boiler temperature rises to 65OC (so-called priority temperature),
the controller shuts o the an. I the boiler temperature reaches 80OC,
the C.H. pump will be activated. I the temperature continues to rise, the
alarm will be activated at 85OC. Such condition may appear when the
water heater or the pump is damaged or when the sensor has been
improperly installed. However, i the temperature drops, the controller
will activate the an at 63OC and it will remain in the duty mode
maintaining the priority temperature o 65OC.
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alarm
CH sensor damage
Alarm
Temp. Too High

ST-81 – USER'S MANUAL
1.III.e) Fuse
The regulator has a network protection WT 3.15 A tube use.
ATTENTION: Higher current ratings may cause damage to the controller.
IV. Maintenance
Be ore and during the heating season, the ST-81 controller should
be checked or condition o its cables. You should also check i the
controller is properly mounted and clean it i dusty or dirty. It is
advisable to measure grounding parameters or the motors (central
heating pump, hot consumption water pump and an).
Technical S ecifications
No. pecification Unit
1Supply voltage V 230V/50Hz +/-10%
2Power consumption W 5
3Ambient temperature OC 5÷50
4
5
Circulation pump outlet load
Fan outlet load
A
A
0,5
0,6
6Temperature measurement range OC 0÷85
7Measurement accuracy OC 1
8Temperature adjustment range OC 45÷85
9
10
Sensor thermal resistance
Fuse insert
OC
A
-25÷90
3,15
V. Assem ly
ATTENTION: all assembly works must only be carried out by quali ied
persons. During assembly, the device must e disconnected (make sure
the power cord is unplugged)!
ATTENTION: improper cable connections may damage the regulator!
Installation should be per ormed according to standard PN-EN303-5.
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TECH
V.a) Cable Connection iagram for Controller
Pay special attention to cable connections during assembly. Especially,
the ground wire should be connected properly.
We are committed to protecting the environment. Manu acturing electronic devices
imposes an obligation o providing or environmentally sa e disposal o used electronic
components and devices. Hence, we have been entered into a register kept by the
Inspection For Environmental Protection. The crossed-out bin symbol on a product
means that the product may not be disposed o to household waste containers.
Recycling o wastes helps to protect the environment. The user is obliged to trans er
their used equipment to a collection point where all electric and electronic components
will be recycled.
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