TECH ST-21D5 Manuale utente
Declaration of Conformity No. 26/2010
Hereby, we declare under sole responsibility that the ST-21
230V 50Hz thermoregulator manufactured by TE H,
headquartered in Wieprz 1047A, 34-122 Wieprz, is compliant
with the Regulation by the Ministry of Economy. (Journal of Laws
Dz.U. 155 Item 1089) of July 21, 2007 implementing provisions
of the Low Voltage Directive (LVD) 2006/95/ C of January
16, 2007.
The ST-21 controller has been tested for electromagnetic
compatibility (EM ) with optimal loads applied.
For compliance assessment, harmonized standards were
used:
PN- N 60730-2-9:2006.
ATT NTION!
High voltage!
Make sure the regulator is disconnected from the
mains before working on the power supply (cable
connections, device installation, etc.)!
All connection works must only be carried out by
qualified electricians.
Before activating the controller, measure the motor
resetting efficiency and inspect wire insulation.
Description of the controller
Operation of the controller
ST-21D4 controller is of multi-purpose type equipped with two
temperature sensors.
The task of the controller is to start the pump if the temperature
difference of sensor exceeds a set value (T2-T1 ≥ Δ), where T2 ≥ then
minimum threshold of the pump. ill disable the pump when the T2 ≤
T1 or T2 < minimum threshold f the pump - 2 ° C (constant hysteresis).
where:
T2-temperature of the boiler
T1-temperature of the boiler (buffer)
Doing so, prevents unnecessary pump operation and unwanted cooling
down the tank when the temperature drops, which cause electricity
saving and prolongs the life of the pump. This increases reliability and
decreases the costs associated with the operation.
ST-21D5 controller is equipped with a system preventing the pump
from inactivity during extended standstill periods. The pump is turned on
for 1 minute approx. every 10 days.
Additional function is the protection of the system from freezing. After
the temperature measured by the boiler sensor drops below 6° the
pump is started to operate continuously. The pump is turned off when the
circuit temperature is increased to 7° .
ALARM
OPERATION
OF THE UNIT
MANUAL
OPERATION
SENSOR
TEMPERATURE T1
or T2
Main screen: selection
of temp T1 view
Edition: plus button
Manual operation:
turning the pump on
MENU
SELECTION AND
ACCEPTANCE OF
SETTINGS
Main screen – pressing
and holding standby
button
When alarm is on –
muting the sound
Manual operation:
exiting manual
operation
Main screen: selection
of temp T2 view
Edition: minus button
Manual operation:
turning the pump off
Operation of the controller
Preview of sensor temperatures is changed by pressing PLUS (temp. of
water in water heater: T1) and MINUS buttons (temp. of supply water
in the boiler: T2). By pressing MENU button the controller will display
the user's menu. Press PLUS or MINUS buttons to navigate in the
menu. Selection of the highlighted function or acceptance of a change in
settings is confirmed by pressing MENU button. Use EXIT button to
cancel the change or exit the menu. By pressing and holding the EXIT
button for 5s in the main screen the standby mode is activated and the
pump power supply is shut off. .
The following controller functions are available in the main M NU:
1. Manual operation
This function allows to start the pump manually (e.g. to check if it
functional). After selection of A1 function the pump can be turned on (by
pressing PLUS button) or off (by pressing MINUS button).
2. Pump turn on delta
The option is used to set the difference in temperatures (Δ) between the
boiler and the tank (∆ = T1-T2) which, when reached, will cause the
pump to start, provided that the temperature exceeds the preset
activation threshold temperature.
3. Turn on threshold temperature
This function is used to set a temperature which, when reached, will
cause the pump to start (so-called turn-on threshold temperature),
provided that the pump turn-on delta has been reached.
A1
A2
A3
Errors displayed
c2 – Heat source sensor error
c1 – Tank sensor error
AL2 – The message and the current T2 temperature are displayed
alternately when the anti-freezing function is turned on (T2 sensor
signal).
AL1 – The message and the current boiler temperature are displayed
alternately when the anti-freezing function is turned on (boiler sensor
signal).
-A- – Message indicating that the anti-stop function is on.
NOT : The occurrence of any alarm will activate the pump
irrespective of the current temperature.
Installation method
Installation should be carried out by a qualified electrician! The sensor
should be fastened using a cable tie and protected isolated from external
influences using insulating tape. Power cord should be connected as
follows:
blue and brown cables: 230V,
yellow-green protective conductor: ground.
Distance between fixing holes is 86.5 mm.
Item Specification Unit
1 Power supply V 230V/50Hz +/-10%
2 Power consumption W 2
3 Ambient temperature O5÷50
4 Load on central heating pump output A 1
5 Temperature adjustment range O0÷90
6 Measurement accuracy O +/- 1
7 Thermal resistance of the sensor O-25÷90
8
9
10
Thermal resistance of the sensor2
Fuse link
Sensor cable length
O
m
A
-25÷90
1,5
1,6
The controller is protected with WT cylindrical fuse link 1.6 A.
Device cabling connection diagram
PE - PROTE TIVE EARTH (YELLOW-GREEN)
N - NEUTRAL (BLUE)
L - LIVE (BROWN)
View of the controller power output
Example of installation (simplified diagram)
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