Technical data

SOLAR
THERMAL
SOLAR
THERMAL
BypassExchanger
Solid fuel
kWh
BHF
Collector
2 st. tank
Collector 3 st. tank
East/West
1 st. tank
East/West 2 st. tank
Collector 1 st. tank
Return increase
Switch
Collector 4 st. tank
East/West
3 st. tank
215
44
152
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Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.stecasolar.com
|83
Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.stecasolar.com
System examples
System with 1 storage tank
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System with east/west roof,
1 storage tank and valve control
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System with east/west roof,
1 storage tank and pump control
System with 2 storage tanks
and pump control
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System with 2 storage tanks
and valve control
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System with east/west roof and
pump control, 2 storage tanks and
valve control
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System with east/west roof and
valve control, 2 storage tanks and
pump control
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System with east/west roof and
valve control, 2 storage tanks and
valve control
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System with 3 storage tanks and
pump control
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System with 3 storage tanks and
valve control
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System with east/west roof and pump
control, 3 storage tanks and
valve control
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System with east/west roof and valve
control, 3 storage tanks and
valve control
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System with 4 storage tanks and
pump control
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System with 4 storage tanks and
valve control
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Systems with internal heat exchanger
with plate heat exchangers
System with 1 storage tank, exter-
nal heat exchanger and fresh water
function
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KW
WW
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System with 2 storage tanks, pump
control and external heat exchanger
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System with 1 storage tank and
external heat exchanger
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System with 1 storage tank, external
heat exchanger with preheating tank
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System with 2 storage tanks, valve
control and external heat exchanger
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System with 3 storage tanks, valve
control and external heat exchanger
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Additional heating
System with 2 storage tanks and
pump control
System with 1 combined storage tank
and external heat exchanger
System with 1 combined storage tank
Steca TR 0704
The TR 0704 system controller is a universal controller
for solar energy and heating systems. In addition to a
selection of pre-programmed basic systems, freely pro-
grammable individual system configurations can also be
realised. The standard TR 0704 has three heat volume
measurement inputs and an hours-of-operation logger
for each of the four controller outputs. A special fea-
ture is the ability to not only display the current values
of temperature, irradiation and energy volumes, but also
to display the accumulated values over several days in the
form of a graphical curve via a graphical dot matrix LCD-
Display. The modular construction of the TR 0704 system
controller allows the control system to be expanded with
up to four extra TA 0403 I/O modules. Every extra I/O mo-
dule has its own microprocessor with four temperature
recording inputs and three switching outputs, some of
which can also be speed controlled. This means that the
controller can be expanded at any time to a maximum
of 23 inputs and 16 outputs. The basic version of the TR
0704 system controller has seven inputs for temperature,
irradiation or flow rate recording and four outputs for
controlling circulation pumps or switching valves. Com-
munication with external peripherals is provided by an IS
bus, a fault message output and an RS232 interface.
Features
Measurement display on a graphical dot matrix
display
Storage of measured values by an integrated data
logger
Freely selectable pre-programmed basic systems
Remote data transfer and remote parameter setting
User-friendly programmability
Heat meter and hours-of-operation logger
Can be modularly extended with the TA 0403 using
the data bus interface
Electronic speed control
Menu-driven LCD-Display
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Temperature Differential Controller
TR 0704
System voltage 230 V (± 15 %), 50 Hz
[optional 115 V (± 15 %), 60 Hz]
Max. own consumption ≤ 3 W
Inputs 7
2 x temperature determination
(Pt1000) or radiation inputs
5 x temperature determination (Pt1000)
or pulse detection for calorimetry
Outputs 4
2 x triac for speed control, max. 250 W (R1),
480 W (R2) [230 V]
2 x switch output relay,
max. 800 W (R3+R4) [230 V]
or R4 voltage free
Turn-on temperature difference 4 ... 17 K
Turn-off temperature difference 2 ... 15 K
Operation temperature range 0 °C ... +45 °C
Display graphic display
Protection class IP 20/DIN 40050
Weight 570 g
Dimensions l x w x h 150 x 215 x 44 mm
Technical data
INPUTS
7
OUTPUTS
4
INPUTS
7
OUTPUTS
4
Temperature
Differential
Controller
Temperature
Differential
Controller
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